Detect Cisco Catalyst SD-WAN Manager Sensitive Information Exposure (CVE-2026-20133) in Sumo Logic CSE
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
Sumo Detection Query
_sourceCategory=cisco/sdwan OR _sourceCategory=network/proxy
| parse regex "(?P<src_ip>\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}).*?(?P<method>GET|POST|PUT|DELETE)\s+(?P<uri_path>/[^\s]+).*?(?P<status_code>\d{3})"
| where uri_path matches "/dataservice/*" or uri_path matches "*/device/config*" or uri_path matches "*/template/*" or uri_path matches "*/auditlog*" or uri_path matches "*/admin/user*" or uri_path matches "*/setting/configuration*"
| where status_code in ("200", "201", "206")
| timeslice 5m
| stats count as request_count, count_distinct(uri_path) as unique_paths, values(uri_path) as paths_accessed by src_ip, _timeslice
| where request_count > 10 or unique_paths > 3
| sort by request_count descSumo Logic query detecting enumeration of Cisco SD-WAN Manager sensitive API endpoints that may represent CVE-2026-20133 exploitation. Groups requests by source IP over 5-minute windows to surface automated scanning or credential harvesting behavior.
Data Sources
Required Tables
False Positives & Tuning
- Scheduled configuration export jobs querying multiple API endpoints
- SD-WAN performance monitoring tools polling device state APIs
- Cisco support tooling performing diagnostics during TAC sessions
- Integration middleware synchronizing SD-WAN configuration with IPAM or CMDB
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
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Get the full detection package for CVE-2026-20133 including response playbook, investigation guide, and atomic red team tests.