Actively exploited
Listed in CISA’s Known Exploited Vulnerabilities catalog since September 29, 2025.
CVE-2025-20352
Cisco IOS and IOS XE Software SNMP Denial of Service and Remote Code Execution Vulnerability
Added to KEV September 29, 2025
Alert details
- Source feed
- CISA KEV
- CVE ID
- CVE-2025-20352
- CWE
- CWE-121
- Affected products
- IOS and IOS XE · Cisco IOS and IOS XE · Cisco
What happened
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.
What it means for your business
Cisco IOS and IOS XE is listed in CISA's Known Exploited Vulnerabilities catalog (CVE-2025-20352). 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. CISA remediation due date: 2025-10-20. If you need help checking exposure, call (864) 335-9223.
Required action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
CISA due date: October 20, 2025
Sources
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