--- title: "Threat Hunt Plan: CVE-2026-0273 / CVE-2026-0272 / CVE-2026-0266 — Palo Alto Networks PAN-OS on RUGGEDCOM APE1808" description: This hunt seeks evidence of abuse of three vulnerabilities disclosed in Siemens advisory SSA-104023 affecting Palo Alto Networks PAN-OS running on RUGGEDCOM APE1808 application processing engines: --- [Skip to content](https://1898advisories.burnsmcd.com/threat-hunt-plan-cve-2026-0273-/-cve-2026-0272-/-cve-2026-0266-palo-alto-networks-pan-os-on-ruggedcom-ape1808#main-content) ![1898-logo-grey-R-1](https://1898advisories.burnsmcd.com/hs-fs/hubfs/1898-logo-grey-R-1.webp?width=188&height=100&name=1898-logo-grey-R-1.webp) - [Cyberthreat](https://1898advisories.burnsmcd.com/tag/cyberthreat) - [Threat Hunt](https://1898advisories.burnsmcd.com/tag/threat-hunt) - [View All](https://1898advisories.burnsmcd.com/) Open main navigation Close main navigation - [Cyberthreat](https://1898advisories.burnsmcd.com/tag/cyberthreat) - [Threat Hunt](https://1898advisories.burnsmcd.com/tag/threat-hunt) - [View All](https://1898advisories.burnsmcd.com/) - [Contact us](https://1898andco.burnsmcd.com/contact-us) [Contact us](https://1898andco.burnsmcd.com/contact-us) July 16, 2026 # Threat Hunt Plan: CVE-2026-0273 / CVE-2026-0272 / CVE-2026-0266 — Palo Alto Networks PAN-OS on RUGGEDCOM APE1808 ![Picture of The 1898 & Co. Team](https://1898advisories.burnsmcd.com/hs-fs/hubfs/1898%20Cyberthreat%20Advisory%20Blog%20Assets/1898-Co-Ampersand.png?width=50&name=1898-Co-Ampersand.png) [The 1898 & Co. Team](https://1898advisories.burnsmcd.com/author/1898-co-team) Revision 1.0 — 2026-07-15 #### Hunt Objective and Scope This hunt seeks evidence of abuse of three vulnerabilities disclosed in Siemens advisory SSA-104023 affecting Palo Alto Networks PAN-OS running on RUGGEDCOM APE1808 application processing engines: an OS command injection allowing root-level command execution (CVE-2026-0273), a missing-authorization privilege escalation to root via the command line interface (CVE-2026-0272), and a stored cross-site scripting flaw in the web management interface (CVE-2026-0266). All three require authenticated administrator access, so the hunt is oriented toward detecting misuse of administrative access to the firewall, root-level activity on the appliance, and post-compromise pivoting across the IT/OT boundary that the device enforces. The environment in scope is the management plane of every RUGGEDCOM APE1808 hosting a PAN-OS Virtual NGFW, the administrative workstations and jump hosts used to reach those devices, and the OT-adjacent Windows hosts and industrial network segments that sit behind the firewall. Because the APE1808 firewall is not itself a CrowdStrike-managed endpoint, endpoint telemetry is applied to the administrative workstations and jump hosts that connect to the management interface and to the OT-adjacent hosts that would be reached during a pivot; PAN-OS system, configuration, and traffic logs forwarded to the SIEM provide device-side visibility. The time window for the hunt is the 60 days preceding execution, extended to the earliest available PAN-OS configuration log if a suspicious change is identified, to capture any administrative activity predating the advisory publication date of 2026-07-14. All hostnames, IP ranges, subnets, and notification handles in this plan are generic placeholders and must be replaced with environment-specific values before execution. No production or client-identifying data is embedded in this document. #### Hypotheses and Hunt Procedures **Hypothesis 1:** An adversary holding authenticated administrator credentials has abused CVE-2026-0273 or CVE-2026-0272 to execute commands as root on an APE1808 PAN-OS instance, observable as anomalous CLI configuration activity in PAN-OS logs and unexpected management-plane sessions from administrative workstations. **MITRE ATT&CK:** Privilege Escalation | T1068 — Exploitation for Privilege Escalation | The missing-authorization and command-injection flaws let an authenticated admin obtain root on the appliance. **MITRE ATT&CK:** Execution | T1059 — Command and Scripting Interpreter | Root-level arbitrary command execution is reached through the PAN-OS CLI. **Collection Queries** **CrowdStrike Falcon CQL** — management-plane sessions from administrative workstations to the firewall management subnet: `#event_simpleName = "NetworkConnectIP4" | in(RemotePort, values=["22","443"]) | cidr(RemoteAddressIP4, subnet=["10.10.20.0/24"]) | join(query={#event_simpleName=ProcessRollup2 | groupBy([aid,RawProcessId], function=selectLast([ImageFileName,FileName,CommandLine,AuthenticationId,ParentBaseFileName]), limit=100000)}, field=[aid,RawProcessId], include=[ImageFileName,FileName,CommandLine,AuthenticationId,ParentBaseFileName]) | table([ComputerName, FileName, RemoteAddressIP4, RemotePort, CommandLine, ParentBaseFileName])` **CrowdStrike Falcon CQL** — remote-administration and file-transfer tooling launched on workstations (image name resolved from ProcessRollup2, UserName enriched from UserIdentity): `#event_simpleName = "ProcessRollup2" | FileName = /^(putty\.exe|plink\.exe|ssh\.exe|pscp\.exe|scp\.exe|winscp\.exe|kitty\.exe)$/i | join(query={#event_simpleName=UserIdentity}, field=AuthenticationId, include=[UserName]) | table([ComputerName, AuthenticationId, UserName, ImageFileName, FileName, CommandLine, ParentBaseFileName])` **Datadog Log Search** — PAN-OS CLI configuration changes (Logs > Explorer): `source:pan-os @type:CONFIG @client:CLI (@cmd:set OR @cmd:edit OR @cmd:delete) // time range: last 60 days` **Datadog Live Process Monitoring** — SSH/administration clients on jump hosts (Infrastructure > Processes — not a log source): `command:ssh user:*` `command:putty` Datadog Log Search fallback where Live Process Monitoring is not enabled (Logs > Explorer): `source:windows @process.name:(ssh.exe OR putty.exe OR plink.exe OR winscp.exe) // time range: last 60 days` Windows Event Log collection on administrative workstations and jump hosts: - 4688 (Process Creation) — launches of ssh.exe, putty.exe, plink.exe, winscp.exe - 4624 (Successful Logon) — interactive and remote logons to jump hosts used for firewall administration - 5156 (Windows Filtering Platform Connection Permitted) — outbound connections to the management subnet `Get-WinEvent -FilterHashtable @{LogName='Security';Id=4688;StartTime=(Get-Date).AddDays(-60)} | Where-Object { $_.Message -match 'ssh\.exe|putty\.exe|plink\.exe|winscp\.exe' } | Export-Csv -NoTypeInformation admin_tool_launches.csv` **OT Data Collection:** Claroty CTD — Investigation tab, filter Protocol to SSH/HTTPS and Source/Destination to the APE1808 management IP, set the hunt date range, Export PCAP per matching session to baseline management-plane access. **OT Data Collection:** Nozomi Networks — query with N2QL to enumerate management sessions reaching the device, run via GET /api/open/query/do?query= after POST /api/open/sign\_in: `links | where protocol == "ssh" or protocol == "https" | where to_ip == "10.10.20.10"` **OT Data Collection:** Armis — baseline the firewall's device record and OT connectivity (ASQ; aggregation applied in the results grid, not the query string): `in:devices type:Firewall` `in:activity type:Connection` BPF packet capture of management-plane traffic to the firewall management interface (rolling hourly capture): `tcpdump -i eth1 -w /opt/hunt/pcap/ape1808_mgmt_%Y%m%d_%H%M%S.pcap -G 3600 -C 100 'host 10.10.20.10 and (tcp port 22 or tcp port 443)'` **Analysis Queries** **CrowdStrike Falcon CQL** — rarity of administrative source hosts contacting the management subnet (rarest first is most suspicious): `#event_simpleName = "NetworkConnectIP4" | in(RemotePort, values=["22","443"]) | cidr(RemoteAddressIP4, subnet=["10.10.20.0/24"]) | groupBy([ComputerName, RemoteAddressIP4, RemotePort], function=count(), limit=100000) | sort(_count, order=asc, limit=50)` **CrowdStrike Falcon CQL** — short-lived administration tool executions correlated across process start and end (image name taken from ProcessRollup2, since EndOfProcess events do not carry ImageFileName): `#event_simpleName = "EndOfProcess" | join(query={#event_simpleName=ProcessRollup2 | groupBy([aid,TargetProcessId], function=selectLast([ImageFileName,FileName,CommandLine,ParentBaseFileName]), limit=100000)}, field=[aid,TargetProcessId], include=[ImageFileName,FileName,CommandLine,ParentBaseFileName]) | FileName = /^(putty\.exe|plink\.exe|ssh\.exe)$/i | table([ComputerName, FileName, ImageFileName, CommandLine, ParentBaseFileName])` **Datadog Log Analytics** — PAN-OS configuration-change volume by administrator and client (Logs > Analytics): `source:pan-os @type:CONFIG // Use Table view; group by @admin, @client; time range: last 60 days` **Datadog Audit Trail** — SIEM access-management changes coinciding with the hunt window (Organization Settings > Audit Trail): `source:datadog @evt.name:"Access Management" // time range: last 60 days` **Datadog Monitor** (one per hypothesis): `Type: Log Alert Query: source:pan-os @type:CONFIG @client:CLI @cmd:(set OR edit OR delete) -@admin:(svc_backup OR svc_panorama) Evaluation window: last 10 minutes Alert condition: count > 0 Message: "ALERT: unexpected PAN-OS CLI configuration change on APE1808 — verify administrator and change ticket @soc-oncall" Prerequisites: PAN-OS config log forwarding to Datadog must be enabled Create via: Monitors > New Monitor > Logs OR POST /api/v1/monitor` **Wireshark display filter** — management sessions to the firewall (tshark equivalent below): `ip.addr == 10.10.20.10 && (ssh || tls.handshake.type == 1)` `tshark -r ape1808_mgmt.pcap -Y "ip.addr == 10.10.20.10 && (ssh || tls.handshake.type == 1)" -T fields -e frame.time -e ip.src -e ip.dst -e tcp.dstport` **Hypothesis 2:** A malicious or compromised administrator has abused CVE-2026-0266 to store a cross-site scripting payload through the PAN-OS web management interface, observable as script-like content in configuration fields and anomalous web-administration sessions. **MITRE ATT&CK:** Persistence | T1505.003 — Server Software Component: Web Shell | A stored payload in the management UI persists across sessions and executes in administrators' browsers. **MITRE ATT&CK:** Credential Access | T1539 — Steal Web Session Cookie | Stored script can capture the session tokens of higher-privileged administrators who view the affected page. **Collection Queries** **Datadog Log Search** — PAN-OS web-interface configuration writes carrying script-like strings (Logs > Explorer): `source:pan-os @type:CONFIG @client:Web (@full-path:*script* OR @after-change-detail:*onerror* OR @after-change-detail:*javascript*) // time range: last 60 days` **Datadog Log Search** — web-administration logins to the device management interface (Logs > Explorer): `source:pan-os @type:SYSTEM @subtype:auth @client:Web // time range: last 60 days` **YARA file-system scan of exported PAN-OS configuration backups for stored script payloads:** `yara -r /opt/hunt/rules/panos_stored_xss.yar /opt/hunt/panos_config_exports/ >> /opt/hunt/out/xss_hits.txt` **OT Data Collection:** Claroty CTD — Investigation tab, filter Destination to the APE1808 management IP and Protocol to HTTPS, Export PCAP for the web-administration sessions in the hunt window. **Analysis Queries** **Datadog Log Analytics** — web-interface configuration writes by administrator (Logs > Analytics): `source:pan-os @type:CONFIG @client:Web // Use Table view; group by @admin, @full-path; time range: last 60 days` **Datadog Monitor** (one per hypothesis): `Type: Log Alert Query: source:pan-os @type:CONFIG @client:Web (@after-change-detail:* 0 Message: "ALERT: possible stored XSS payload written to PAN-OS web config on APE1808 @soc-oncall" Prerequisites: PAN-OS config log forwarding with after-change-detail field mapping enabled Create via: Monitors > New Monitor > Logs OR POST /api/v1/monitor` Windows Event Log analysis on administrator workstations — browser sessions to the management interface (PowerShell): `Get-WinEvent -FilterHashtable @{LogName='Security';Id=5156;StartTime=(Get-Date).AddDays(-60)} | Where-Object { $_.Message -match '10\.10\.20\.10' -and $_.Message -match ':443' } | Export-Csv -NoTypeInformation mgmt_web_connections.csv` **Hypothesis 3:** Having obtained root on the APE1808 firewall, an adversary has weakened firewall policy and pivoted from the device across the IT/OT boundary, observable as new cross-zone connections and credential-access activity on OT-adjacent Windows hosts. **MITRE ATT&CK:** Lateral Movement | T1021 — Remote Services | Root control of the boundary firewall enables policy changes that open lateral paths into protected OT segments. **MITRE ATT&CK:** Credential Access | T1003 — OS Credential Dumping | Pivoting into OT-adjacent Windows hosts is commonly followed by credential theft to expand access. **Collection Queries** **CrowdStrike Falcon CQL** — inbound connections to OT-adjacent Windows hosts sourced from the firewall data-plane interfaces: `#event_simpleName = "NetworkReceiveAcceptIP4" | cidr(RemoteAddressIP4, subnet=["10.10.20.0/24","10.10.21.0/24"]) | join(query={#event_simpleName=ProcessRollup2 | groupBy([aid,RawProcessId], function=selectLast([ImageFileName,FileName,CommandLine,AuthenticationId]), limit=100000)}, field=[aid,RawProcessId], include=[ImageFileName,FileName,CommandLine,AuthenticationId]) | table([ComputerName, FileName, RemoteAddressIP4, LocalPort, CommandLine])` **CrowdStrike Falcon CQL** — credential-access tooling on OT-adjacent hosts: `#event_simpleName = "ProcessRollup2" | FileName = /^(mimikatz\.exe|procdump\.exe|procdump64\.exe|wce\.exe|gsecdump\.exe)$/i | table([ComputerName, AuthenticationId, ImageFileName, FileName, CommandLine, ParentBaseFileName])` YARA process-memory scan for credential-dumping artifacts on a suspect OT-adjacent host (classic YARA, positional PID): `yara /opt/hunt/rules/cred_dump_memory.yar 660 >> /opt/hunt/out/cred_dump_hits.txt` **OT Data Collection:** Dragos Platform — Communications Hub, filter zone-to-zone across the IT/OT boundary, apply a saved filter for new source/destination pairs, and export event-based PCAP with asset context on both endpoints. **OT Data Collection:** Tenable OT Security — Inventory > All Assets, select the OT-adjacent assets, Export; correlate new communication paths via Network > Network Map (programmatic access is GraphQL only at /graphql). SNMP polling of the switch port facing the APE1808 to detect traffic anomalies during the pivot window (use 64-bit counters to avoid wrap on high-speed links): `snmpwalk -v3 -l authPriv -u hunt_ro -a SHA -A '' -x AES -X '' 10.10.20.1 IF-MIB::ifTable` `snmpget -v3 -l authPriv -u hunt_ro -a SHA -A '' -x AES -X '' 10.10.20.1 IF-MIB::ifHCInOctets.7 IF-MIB::ifHCOutOctets.7 IF-MIB::ifInErrors.7 IF-MIB::ifOutErrors.7` **Analysis Queries** **CrowdStrike Falcon CQL** — rare inbound connection paths to OT-adjacent hosts (rarest first): `#event_simpleName = "NetworkReceiveAcceptIP4" | cidr(RemoteAddressIP4, subnet=["10.10.20.0/24","10.10.21.0/24"]) | groupBy([ComputerName, RemoteAddressIP4, LocalPort], function=count(), limit=100000) | sort(_count, order=asc, limit=50)` **Datadog Log Analytics** — PAN-OS traffic-log denies-turned-allows across the boundary zones (Logs > Analytics): `source:pan-os @type:TRAFFIC @action:allow @from-zone:OT @to-zone:IT // Use Timeseries view; group by @rule; time range: last 60 days` **Datadog Monitor** (one per hypothesis): `Type: Log Alert Query: source:pan-os @type:CONFIG @full-path:*rulebase*security* @cmd:(set OR edit OR delete) Evaluation window: last 15 minutes Alert condition: count > 0 Message: "ALERT: PAN-OS security rulebase change on APE1808 — possible boundary weakening @soc-oncall" Prerequisites: PAN-OS config log forwarding to Datadog must be enabled Create via: Monitors > New Monitor > Logs OR POST /api/v1/monitor` **OT protocol analysis** — baseline and deviation of industrial traffic crossing the firewall (tshark equivalents below): `eip && cip.service == 0x4c` `tshark -r boundary.pcap -Y "modbus || dnp3 || eip" -T fields -e frame.time -e ip.src -e ip.dst -e _ws.col.Protocol` **Wireshark display filter** — unexpected cleartext administration or protocol tunneling from the firewall data plane: `ip.src == 10.10.20.10 && !(ssl || ssh || snmp)` #### Threat Actor Profile The precondition of authenticated administrator access narrows the realistic actor set to three profiles. The first is a malicious or negligent insider — an administrator with legitimate credentials who abuses CVE-2026-0272 or CVE-2026-0273 to obtain root and act beyond their authorized role; this actor has direct management access and requires no external foothold. The second is an external intruder who has already harvested administrator credentials through phishing, credential reuse, or compromise of a jump host, and who uses the vulnerabilities to convert administrative access into full appliance control. The third and most consequential profile is a capable, likely state-aligned actor targeting critical infrastructure, for whom the boundary firewall is a strategic objective. Such actors have demonstrated patience in OT environments, favor living-off-the-land techniques on network devices, disable or tamper with logging, and use compromised perimeter devices as long-dwell pivots into control system networks. Their access path typically begins in the enterprise network, moves to an administrative workstation or jump host, and then to the firewall management plane, from which policy is quietly altered to enable lateral movement while normal operations continue undisturbed. Across all three profiles the common TTPs to hunt are anomalous management-plane authentication, CLI configuration changes inconsistent with change tickets, security-rulebase modifications that open cross-zone paths, tampering with logging or syslog forwarding, and subsequent credential access on OT-adjacent Windows hosts. #### Data Sources Required **Network:** full packet capture at the firewall management interface and at the IT/OT boundary, NetFlow across boundary zones, and switch interface counters via SNMP. Endpoint: CrowdStrike Falcon telemetry (ProcessRollup2, EndOfProcess, NetworkConnectIP4, NetworkReceiveAcceptIP4, UserIdentity) on administrative workstations, jump hosts, and OT-adjacent Windows hosts; Windows Security Event Logs (4688, 4624, 5156) from the same hosts. Device and vendor logs: PAN-OS configuration, system, and traffic logs forwarded to Datadog, plus the Datadog audit trail for SIEM-side access changes. OT/ICS: Claroty CTD, Dragos Platform, Nozomi Networks, Armis, and Tenable OT Security exports for management-plane session baselines and cross-zone communication analysis, and SNMP trap logs from the trap receiver. #### Detection Signatures **SIGMA rule 1** — remote-administration tooling reaching the firewall management subnet (process\_creation): `title: Firewall Management Access Tooling On Non-Admin Host id: 7a1c9e34-2b6d-4f81-9c05-3e7a2d4b6f10 status: experimental description: Detects SSH/SCP client execution on hosts that are not designated firewall administration workstations, indicating possible misuse of PAN-OS management access. references: - https://cert-portal.siemens.com/productcert/html/ssa-104023.html author: Threat Hunt Team date: 2026-07-15 tags: - attack.execution - attack.t1059 logsource: category: process_creation product: windows detection: selection: Image|endswith: - '\putty.exe' - '\plink.exe' - '\ssh.exe' - '\winscp.exe' filter_admins: ComputerName|startswith: 'FWADMIN-' condition: selection and not filter_admins falsepositives: - Authorized administration from a host not matching the FWADMIN naming convention level: medium` **SIGMA rule 2** — connection to the firewall management interface from an unexpected source (network\_connection): `title: Unexpected Connection To PAN-OS Management Interface id: 8b2d0f45-3c7e-4a92-8d16-4f8b3e5c7a21 status: experimental description: Detects TCP connections to the APE1808 management IP on SSH or HTTPS from source hosts outside the approved administration range. references: - https://cert-portal.siemens.com/productcert/html/ssa-104023.html author: Threat Hunt Team date: 2026-07-15 tags: - attack.lateral_movement - attack.t1021 logsource: category: network_connection product: windows detection: selection: DestinationIp: '10.10.20.10' DestinationPort: - 22 - 443 filter_admin_range: SourceIp|cidr: '10.10.20.0/24' condition: selection and not filter_admin_range falsepositives: - Break-glass administration from outside the standard range level: medium` **SIGMA rule 3** — PAN-OS security rulebase modification (paloalto configuration): `title: PAN-OS Security Rulebase Change On APE1808 id: 9c3e1a56-4d8f-4b03-9e27-5a9c4f6d8b32 status: experimental description: Detects configuration changes to the PAN-OS security rulebase that could weaken IT/OT boundary enforcement following exploitation of CVE-2026-0272 or CVE-2026-0273. references: - https://cert-portal.siemens.com/productcert/html/ssa-104023.html author: Threat Hunt Team date: 2026-07-15 tags: - attack.defense_evasion - attack.t1562.007 logsource: product: paloalto service: config detection: selection: type: 'CONFIG' full-path|contains: 'rulebase/security' cmd: - 'set' - 'edit' - 'delete' condition: selection falsepositives: - Scheduled policy updates performed through change management level: high` **Snort/Suricata rule 1** — SSH to the management interface from outside the administration range: `alert tcp !10.10.20.0/24 any -> 10.10.20.10 22 (msg:"APE1808 PAN-OS management SSH from unauthorized source"; flow:to_server; flags:S; threshold:type limit, track by_src, count 1, seconds 60; classtype:attempted-admin; sid:1000001; rev:1; reference:url,cert-portal.siemens.com/productcert/html/ssa-104023.html;)` **Snort/Suricata rule 2** — cleartext administrative HTTP carrying a script payload (only fires if management HTTP is unexpectedly enabled): `alert tcp any any -> 10.10.20.10 80 (msg:"APE1808 PAN-OS possible stored XSS payload in cleartext management HTTP"; flow:to_server,established; content:"