Overview
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.
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snmp-x4LPhte ; https://nvd.nist.gov/vuln/detail/CVE-2025-20352
Key Details
| Property | Value |
|---|---|
| CVE ID | CVE-2025-20352 |
| Vendor / Product | Cisco — IOS and IOS XE |
| NVD Published | 2025-09-24 |
| NVD Last Modified | 2025-10-28 |
| CVSS 3.1 Score | 7.7 |
| CVSS 3.1 Vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H |
| Severity | HIGH |
| CWE | CWE-121 |
| CISA KEV Added | 2025-09-29 |
| CISA KEV Deadline | 2025-10-20 |
| Known Ransomware Use | No |
CVSS 3.1 Breakdown
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
None
Availability
High
Required Action
CISA BOD 22-01 Deadline: 2025-10-20.
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Timeline
| Date | Event |
|---|---|
| 2025-09-29 | Added to CISA Known Exploited Vulnerabilities catalog |
| 2025-10-20 | CISA BOD 22-01 remediation deadline |
References
| Resource | Type |
|---|---|
| NVD — CVE-2025-20352 | Vulnerability Database |
| CISA KEV Catalog Entry | US Government |