Detect CVE-2025-20393 — Cisco Multiple Products Improper Input Validation (KEV) in CrowdStrike LogScale
Detects exploitation attempts targeting CVE-2025-20393, an improper input validation vulnerability (CWE-20) affecting Cisco Multiple Products. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active in-the-wild exploitation. Attackers may leverage this flaw to bypass security controls, execute unauthorized commands, or gain elevated access to affected Cisco appliances.
MITRE ATT&CK
LogScale Detection Query
event_simpleName IN ("NetworkConnectIP4", "HttpRequest", "ProcessRollup2")
| filter (DeviceVendor="Cisco" OR CommandLine=/(?i)cisco/)
AND (
HttpRequestUri=/(\.\.\/|%2e%2e%2f|%252e|;|\x00)/
OR CommandLine=/(?i)(input.?validation|CVE-2025-20393|sma.*attack)/
)
| eval attacker_ip=coalesce(RemoteAddressIP4, LocalAddressIP4)
| stats count() as hits, values(HttpRequestUri) as uris, values(CommandLine) as cmds by attacker_ip, ComputerName, timestamp
| where hits > 1
| sort -hitsCrowdStrike Falcon LogScale query correlating network and process events on or targeting Cisco products with known CVE-2025-20393 exploitation patterns including path traversal sequences and command injection markers.
Data Sources
Required Tables
False Positives & Tuning
- Falcon sensor telemetry noise from legitimate Cisco management daemon processes
- Vulnerability assessment platforms generating HTTP probe traffic against Cisco endpoints
- CI/CD pipelines running integration tests against Cisco API mocks with unusual input values
Other platforms for CVE-2025-20393
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 1Path Traversal Probe Against Cisco SMA Interface
Expected signal: HTTP request log entry with URI containing '../' sequences recorded in Cisco SMA access log; network flow record from test host to Cisco appliance on port 443
- Test 2Null Byte Injection Input Validation Test
Expected signal: HTTP request containing '%00' in query string logged by network proxy or Cisco appliance; potential error response indicating input validation failure
- Test 3Automated Exploitation Pattern Simulation with Repeated Requests
Expected signal: Ten sequential HTTP requests with encoded path traversal sequences from same source IP within 10 seconds, logged across Cisco access logs and network flow telemetry
Unlock Pro Content
Get the full detection package for CVE-2025-20393 including response playbook, investigation guide, and atomic red team tests.