Stack-based buffer overflow in Cisco IOS XE - CVE-2025-20352
Published: September 24, 2025 / Updated: September 25, 2025
Vulnerability identifier: #VU116083
CSH Severity: High
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-20352
CWE-ID: CWE-121
Exploitation vector: Remote access
Exploit availability:
The vulnerability is being exploited in the wild
Vulnerability details
The vulnerability allows a remote user to compromise the affected system.
The vulnerability exists due to a boundary error within the SNMP subsystem. A remote privileged user can send specially crafted SNMP packets to the affected device, trigger a stack-based buffer overflow and execute arbitrary code with root privileges.
Note, the vulnerability is being actively exploited in the wild.
Affected software
Cisco IOS XE
How to mitigate CVE-2025-20352
Install updates from vendor's website.
Cisco IOS XE - update to 17.12.6