CVE-2025-20352
Actively exploited. CVE-2025-20352 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2025-09-29) — exploitation has been observed in the wild, and US federal agencies are required to remediate it under BOD 22-01. Treat patching as urgent.
Public exploit code is available. Proof-of-concept or working exploit code for CVE-2025-20352 is indexed in GitHub PoC. Expect opportunistic scanning and exploitation attempts — prioritize remediation.
Cisco IOS and IOS XE contains a stack-based buffer overflow vulnerability in the Simple Network Management Protocol (SNMP) subsystem that could allow for denial of service or remote code execution. A successful exploit could allow a low-privileged attacker to cause the affected system to reload, resulting in a DoS condition, or allow a high-privileged attacker to execute arbitrary code as the root user and obtain full control of the affected system.
CSIRTS triage
- What
- The vulnerability allows for denial of service or remote code execution via a buffer overflow in the SNMP subsystem.
- Who is affected
- Users of Cisco IOS and IOS XE software.
- Urgency
- Immediate remediation is necessary due to active exploitation and critical risk.
- Action
- Update to the latest IOS and IOS XE software versions.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 98% of all EPSS-scored CVEs.
Exploit availability
Public exploit or proof-of-concept code for CVE-2025-20352 is indexed in these free datasets. Available exploit code raises real-world risk independent of the CVSS score.
- GitHub PoCPublic proof-of-concept repositories on GitHub reference this CVE.look it up ↗
Advisory coverage (1)
- criticalexploitedCVE-2025-20352: Cisco IOS and IOS XE Software SNMP Denial of Service and Remote Code Execution Vulnerabilitycisa-kev · 2025-09-29
External references
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