Detect Cisco Catalyst SD-WAN Manager Privileged API Abuse (CVE-2026-20122) in CrowdStrike LogScale
Detects exploitation of CVE-2026-20122, a critical vulnerability in Cisco Catalyst SD-WAN Manager involving incorrect use of privileged APIs (CWE-648). This KEV-listed flaw allows attackers to invoke privileged API endpoints without proper authorization, potentially enabling unauthorized configuration changes, credential harvesting, or full SD-WAN infrastructure takeover. Active exploitation has been observed in the wild per CISA Emergency Directive ED-26-03.
MITRE ATT&CK
LogScale Detection Query
#event_simpleName=NetworkConnectIP4 OR #event_simpleName=NetworkReceiveAcceptIP4
| TargetPort in (443, 8443, 8080)
| HttpMethod in ("POST", "PUT", "DELETE", "PATCH")
| HttpPath = /\/dataservice\/(admin|system|device\/action|template|settings\/configuration|certificate|aaa)/
| HttpStatus in ("200", "201", "204")
| groupBy([RemoteAddressIP4, LocalAddressIP4, HttpPath, HttpMethod], function=[
count(aid, as=request_count),
countDistinct(HttpPath, as=unique_paths),
min(timestamp, as=first_seen),
max(timestamp, as=last_seen),
collect(HttpPath, as=paths_list, limit=20)
])
| request_count >= 3 OR unique_paths >= 2
| eval risk_level=if(unique_paths >= 4, "Critical", if(unique_paths >= 2, "High", "Medium"))
| sort(unique_paths, order=desc)
| sort(request_count, order=desc)CrowdStrike Falcon LogScale (CQL) query detecting workloads connecting to Cisco SD-WAN Manager privileged API endpoints with repeated successful mutations, surfacing potential CVE-2026-20122 exploitation from endpoints visible to Falcon sensors.
Data Sources
Required Tables
False Positives & Tuning
- SD-WAN management hosts running orchestration agents that regularly push configuration via the admin API
- Jump servers or bastion hosts used by network engineers connecting to vManage and triggering legitimate admin API flows
- Vulnerability scanning agents on endpoints targeting the SD-WAN management plane during authorized scans
Other platforms for CVE-2026-20122
Testing Methodology
Validate this detection against 4 adversary techniques from Atomic Red Team. Each test below lists the behaviour to exercise and the telemetry you should expect to see. Executable commands and cleanup steps are available with Pro.
- Test 1Unauthenticated SD-WAN Manager Privileged API Probe
Expected signal: HTTP GET requests to /dataservice/admin/user, /dataservice/system/information, /dataservice/aaa/usergroup, /dataservice/certificate/list from the test host to port 8443, logged in vManage access logs and network flow.
- Test 2Privileged API Admin Account Creation Simulation
Expected signal: POST to /dataservice/aaa/user with a new username payload logged in vManage audit log, network capture showing the request body containing userName and group fields.
- Test 3SD-WAN Manager Template Enumeration and Exfiltration Simulation
Expected signal: Sequential GET requests to /dataservice/template/device, /dataservice/template/feature, /dataservice/device, and /dataservice/device/action/list within a short timeframe from a single source IP.
- Test 4Rapid Privileged API Burst from Single Source
Expected signal: 21+ HTTP requests across 7 distinct privileged API paths within seconds, all from the same source IP, logged in vManage access logs and network telemetry.
References (4)
- https://www.cisa.gov/news-events/directives/ed-26-03-mitigate-vulnerabilities-cisco-sd-wan-systems
- https://www.cisa.gov/news-events/directives/supplemental-direction-ed-26-03-hunt-and-hardening-guidance-cisco-sd-wan-systems
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-authbp-qwCX8D4v
- https://nvd.nist.gov/vuln/detail/CVE-2026-20122
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