Detect Cisco Catalyst SD-WAN Manager Sensitive Information Exposure (CVE-2026-20133) in Elastic Security
Detects exploitation attempts targeting CVE-2026-20133, a CWE-200 information disclosure vulnerability in Cisco Catalyst SD-WAN Manager that allows unauthorized actors to access sensitive configuration and credential data. This vulnerability is actively exploited in the wild (CISA KEV) and may be leveraged to pivot into SD-WAN infrastructure.
MITRE ATT&CK
- Tactic
- Credential Access Discovery Collection
Elastic Detection Query
sequence by source.ip with maxspan=10m
[network where event.category == "network" and
destination.port in (443, 8443, 8080) and
url.path : ("/dataservice/*", "*/auditlog*", "*/device/config*", "*/template/*", "*/setting/configuration*", "*/admin/user*") and
http.response.status_code in (200, 201, 206)]
[network where event.category == "network" and
destination.port in (443, 8443, 8080) and
url.path : ("/dataservice/*", "*/device/*", "*/template/*") and
http.response.status_code in (200, 201, 206)]EQL sequence rule detecting sequential access to multiple Cisco SD-WAN Manager sensitive API endpoints from a single source IP within a 10-minute window, indicative of automated information harvesting characteristic of CVE-2026-20133 exploitation.
Data Sources
Required Tables
False Positives & Tuning
- Legitimate SD-WAN orchestration tools making sequential API calls
- Health monitoring scripts checking multiple device configuration endpoints
- Administrator activity during network provisioning or migration tasks
- Cisco vManage internal service-to-service API communication
Other platforms for CVE-2026-20133
Testing Methodology
Validate this detection against 3 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 Device Config Enumeration
Expected signal: HTTP GET requests to SD-WAN Manager management port (8443) for paths /dataservice/device, /dataservice/device/config, and /dataservice/admin/user from the test host IP. Response codes may be 200 (vulnerable) or 401/403 (patched/mitigated).
- Test 2SD-WAN Manager Template and Credential Harvest Simulation
Expected signal: File creation events in /tmp/sdwan_harvest_test alongside network connections to vManage port 8443. Curl process making multiple sequential HTTP GET requests to /dataservice/template/device, /dataservice/setting/configuration, and /dataservice/auditlog.
- Test 3Automated SD-WAN Manager API Endpoint Enumeration with Token Extraction
Expected signal: Rapid sequential HTTP GET requests (9 requests within ~5 seconds with 0.5s delay) to multiple /dataservice/ subpaths from a single source IP. HTTP status codes logged for each endpoint. Process: bash script executing curl in a loop.
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-2026-20133
Unlock Pro Content
Get the full detection package for CVE-2026-20133 including response playbook, investigation guide, and atomic red team tests.