CVE-2025-20352
Cisco IOS and IOS XE Software SNMP Denial of Service and Remote Code Execution Vulnerability
CVSS
—
No CVSS
EPSS
39.4%
p99
KEV
YES
Sep 29, 2025
Exploit Today
80
0-100
Published: — · Last modified: —
Product
Cisco / IOS and IOS XE
Vulnerability
Cisco IOS and IOS XE Software SNMP Denial of Service and Remote Code Execution Vulnerability
Added to KEV
Sep 29, 2025
Remediate by
Oct 20, 2025
Known ransomware use
No
Summary description
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.
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.
Notes
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snmp-x4LPhte ; https://nvd.nist.gov/vuln/detail/CVE-2025-20352