Detect Cisco Unified Communications Manager SSRF Exploitation Detected in Sumo Logic CSE
Detects exploitation attempts of CVE-2026-20230, a Server-Side Request Forgery (SSRF) vulnerability in Cisco Unified Communications Manager (CUCM). An unauthenticated remote attacker may craft malicious HTTP requests to the CUCM web interface to cause the server to initiate requests to arbitrary internal or external destinations, potentially enabling internal network reconnaissance, credential theft via metadata services, or pivoting to internal resources.
MITRE ATT&CK
Sumo Detection Query
_sourceCategory=cisco/cucm OR _sourceCategory=network/proxy
| parse regex "(?i)(?:url|dest|redirect|callback|target)=(?P<extracted_url>[^\s&\"']+)"
| parse regex "(?P<uri_path>/(?:ccmadmin|cucm-uds|ucmuser|ccmuser|cmplatform)/[^\s]*)"
| where (
extracted_url matches "*169.254.169.254*" OR
extracted_url matches "*metadata.google.internal*" OR
extracted_url matches "*100.100.100.200*" OR
extracted_url matches "*127.0.0.1*" OR
extracted_url matches "*localhost*" OR
extracted_url matches "*::1*" OR
extracted_url matches "*file://*" OR
extracted_url matches "*dict://*" OR
extracted_url matches "*gopher://*" OR
extracted_url matches "*ldap://*"
)
| count by _sourceHost, src_ip, uri_path, extracted_url
| sort by _count descSumo Logic query for detecting SSRF attempts against Cisco CUCM by parsing URL parameters from CUCM-related log sources and identifying suspicious internal or metadata service destinations.
Data Sources
Required Tables
False Positives & Tuning
- Legitimate CUCM API integrations passing internal hostnames as callback parameters
- Authorized security assessments including SSRF test payloads
- Network monitoring agents that enumerate internal services via CUCM API endpoints
- Misconfigured DNS resolvers causing internal address resolution in CUCM requests
Other platforms for CVE-2026-20230
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 1SSRF Probe via CUCM Admin Interface URL Parameter
Expected signal: HTTP GET request to /ccmadmin/ with redirectUrl parameter containing 169.254.169.254; subsequent outbound TCP connection from CUCM server to 169.254.169.254:80 if vulnerable
- Test 2SSRF via Gopher Protocol Scheme in CUCM API Parameter
Expected signal: HTTP GET to /cucm-uds/ endpoint with gopher:// scheme in callback parameter; potential TCP connection from CUCM server to 127.0.0.1:6379 if exploitable
- Test 3SSRF Internal Network Scan via CUCM Redirect Parameter
Expected signal: Multiple HTTP requests to /ccmuser/ with varying port numbers in src parameter containing RFC1918 addresses; timing differences in responses may reveal open ports on internal hosts if CUCM is vulnerable
References (4)
- https://www.cisco.com/c/en/us/support/docs/csa/cisco-sa-cucm-ssrf-cXPnHcW.html
- https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk
- https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk
- https://nvd.nist.gov/vuln/detail/CVE-2026-20230
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