---
id: CVE-2025-20352
title: "A vulnerability in the Simple Network Management Protocol (SNMP) subsystem of Cisco IOS Software and Cisco IOS XE Software could allow the following:\r\n\r \r An authenticated, remote attacker with low privileges could cause a denial of serv…"
summary: "A vulnerability in the Simple Network Management Protocol (SNMP) subsystem of Cisco IOS Software and Cisco IOS XE Software could allow the following:\r\n\r \r An authenticated, remote attacker with low privileges could cause a denial of serv…"
severity: high
cvss: 7.7
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H'
cwe:
  - CWE-121
vendor: cisco
product: ios_xe_sd-wan
affected:
  - ios_xe_sd-wan = 16.9.1
  - ios_xe_sd-wan = 16.9.2
  - ios_xe_sd-wan = 16.9.3
  - ios_xe_sd-wan = 16.9.4
  - ios_xe_sd-wan = 16.10.1
  - ios_xe_sd-wan = 16.10.2
  - ios_xe_sd-wan = 16.10.3
  - ios_xe_sd-wan = 16.10.3a
  - ios_xe_sd-wan = 16.10.3b
  - ios_xe_sd-wan = 16.10.4
  - ios_xe_sd-wan = 16.10.5
  - ios_xe_sd-wan = 16.10.6
  - ios_xe_sd-wan = 16.11.1a
  - ios_xe_sd-wan = 16.12.1b
  - ios_xe_sd-wan = 16.12.1d
  - ios_xe_sd-wan = 16.12.1e
  - ios_xe_sd-wan = 16.12.2r
  - ios_xe_sd-wan = 16.12.3
  - ios_xe_sd-wan = 16.12.4
  - ios_xe_sd-wan = 16.12.4a
  - ios_xe_sd-wan = 16.12.5
  - ios_xe = 3.5.0e
  - ios_xe = 3.5.0sq
  - ios_xe = 3.5.1e
  - ios_xe = 3.5.1sq
  - ios_xe = 3.5.2e
  - ios_xe = 3.5.2sq
  - ios_xe = 3.5.3e
  - ios_xe = 3.5.3sq
  - ios_xe = 3.5.4sq
  - ios_xe = 3.5.5sq
  - ios_xe = 3.5.6sq
  - ios_xe = 3.5.7sq
  - ios_xe = 3.5.8sq
  - ios_xe = 3.6.0e
  - ios_xe = 3.6.1e
  - ios_xe = 3.6.2ae
  - ios_xe = 3.6.2e
  - ios_xe = 3.6.3e
  - ios_xe = 3.6.4e
  - ios_xe = 3.6.5ae
  - ios_xe = 3.6.5e
  - ios_xe = 3.6.6e
  - ios_xe = 3.6.7be
  - ios_xe = 3.6.7e
  - ios_xe = 3.6.8e
  - ios_xe = 3.6.9e
  - ios_xe = 3.6.10e
  - ios_xe = 3.7.0e
  - ios_xe = 3.7.1e
  - ios_xe = 3.7.2e
  - ios_xe = 3.7.3e
  - ios_xe = 3.7.4e
  - ios_xe = 3.7.5e
  - ios_xe = 3.8.0e
  - ios_xe = 3.8.1e
  - ios_xe = 3.8.2e
  - ios_xe = 3.8.3e
  - ios_xe = 3.8.4e
  - ios_xe = 3.8.5ae
  - ios_xe = 3.8.5e
  - ios_xe = 3.8.6e
  - ios_xe = 3.8.7e
  - ios_xe = 3.8.8e
  - ios_xe = 3.8.9e
  - ios_xe = 3.8.10e
  - ios_xe = 3.9.0e
  - ios_xe = 3.9.1e
  - ios_xe = 3.9.2e
  - ios_xe = 3.10.0ce
  - ios_xe = 3.10.0e
  - ios_xe = 3.10.1e
  - ios_xe = 3.10.2e
  - ios_xe = 3.10.3e
  - ios_xe = 3.11.0e
  - ios_xe = 3.11.1ae
  - ios_xe = 3.11.1e
  - ios_xe = 3.11.2e
  - ios_xe = 3.11.3ae
  - ios_xe = 3.11.3e
  - ios_xe = 3.11.4e
  - ios_xe = 3.11.5e
  - ios_xe = 3.11.6e
  - ios_xe = 3.11.7e
  - ios_xe = 3.11.8e
  - ios_xe = 3.11.9e
  - ios_xe = 3.11.10e
  - ios_xe = 3.11.11e
  - ios_xe = 3.11.12e
  - ios_xe = 3.14.0s
  - ios_xe = 3.14.1s
  - ios_xe = 3.14.2s
  - ios_xe = 3.14.3s
  - ios_xe = 3.14.4s
  - ios_xe = 3.15.0s
  - ios_xe = 3.15.1cs
  - ios_xe = 3.15.1s
  - ios_xe = 3.15.2s
  - ios_xe = 3.15.3s
  - ios_xe = 3.15.4s
published: '2025-09-24'
updated: '2026-09-26'
sourceUpdated: '2026-09-26T00:10:00.127'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-20352'
references:
  - url: >-
      https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snmp-x4LPhte
    label: psirt@cisco.com
  - url: >-
      https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-20352
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://software.cisco.com'
tags:
  - nvd
  - kev
  - in-the-wild
  - exploit-available
  - csaf
  - vendor-advisory
  - cisco
epss: 0.39447
epssPercentile: 0.98561
kev: true
kevDateAdded: '2025-09-29'
kevDueDate: '2025-10-20'
kevRansomware: false
exploited: true
exploits:
  github: 2
  githubRepos:
    - 'https://github.com/scadastrangelove/CVE-2025-20352'
    - 'https://github.com/sentinel-aidefense/CVE-2025-20352'
  checkedAt: '2026-09-26T00:23:14.509Z'
exploitAvailable: true
ingestedAt: '2026-09-25T07:41:37.791Z'
---

## Overview

A vulnerability in the Simple Network Management Protocol (SNMP) subsystem of Cisco IOS Software and Cisco IOS XE Software could allow the following:

 
 An authenticated, remote attacker with low privileges could cause a denial of service (DoS) condition on an affected device that is running Cisco IOS Software or Cisco IOS XE Software. To cause the DoS, the attacker must have the SNMPv2c or earlier read-only community string or valid SNMPv3 user credentials. 
 An authenticated, remote attacker with high privileges could execute code as the root user on an affected device that is running Cisco IOS XE Software. To execute code as the root user, the attacker must have the SNMPv1 or v2c read-only community string or valid SNMPv3 user credentials and administrative or privilege 15 credentials on the affected device. 
 
 An attacker could exploit this vulnerability by sending a crafted SNMP packet to an affected device over IPv4 or IPv6 networks. 

 This vulnerability is due to a stack overflow condition in the SNMP subsystem of the affected software. 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.

 Note: This vulnerability affects all versions of SNMP.

## Affected

- `ios_xe_sd-wan = 16.9.1`
- `ios_xe_sd-wan = 16.9.2`
- `ios_xe_sd-wan = 16.9.3`
- `ios_xe_sd-wan = 16.9.4`
- `ios_xe_sd-wan = 16.10.1`
- `ios_xe_sd-wan = 16.10.2`
- `ios_xe_sd-wan = 16.10.3`
- `ios_xe_sd-wan = 16.10.3a`
- `ios_xe_sd-wan = 16.10.3b`
- `ios_xe_sd-wan = 16.10.4`
- `ios_xe_sd-wan = 16.10.5`
- `ios_xe_sd-wan = 16.10.6`
- `ios_xe_sd-wan = 16.11.1a`
- `ios_xe_sd-wan = 16.12.1b`
- `ios_xe_sd-wan = 16.12.1d`
- `ios_xe_sd-wan = 16.12.1e`
- `ios_xe_sd-wan = 16.12.2r`
- `ios_xe_sd-wan = 16.12.3`
- `ios_xe_sd-wan = 16.12.4`
- `ios_xe_sd-wan = 16.12.4a`
- `ios_xe_sd-wan = 16.12.5`
- `ios_xe = 3.5.0e`
- `ios_xe = 3.5.0sq`
- `ios_xe = 3.5.1e`
- `ios_xe = 3.5.1sq`
- `ios_xe = 3.5.2e`
- `ios_xe = 3.5.2sq`
- `ios_xe = 3.5.3e`
- `ios_xe = 3.5.3sq`
- `ios_xe = 3.5.4sq`
- `ios_xe = 3.5.5sq`
- `ios_xe = 3.5.6sq`
- `ios_xe = 3.5.7sq`
- `ios_xe = 3.5.8sq`
- `ios_xe = 3.6.0e`
- `ios_xe = 3.6.1e`
- `ios_xe = 3.6.2ae`
- `ios_xe = 3.6.2e`
- `ios_xe = 3.6.3e`
- `ios_xe = 3.6.4e`
- `ios_xe = 3.6.5ae`
- `ios_xe = 3.6.5e`
- `ios_xe = 3.6.6e`
- `ios_xe = 3.6.7be`
- `ios_xe = 3.6.7e`
- `ios_xe = 3.6.8e`
- `ios_xe = 3.6.9e`
- `ios_xe = 3.6.10e`
- `ios_xe = 3.7.0e`
- `ios_xe = 3.7.1e`
- `ios_xe = 3.7.2e`
- `ios_xe = 3.7.3e`
- `ios_xe = 3.7.4e`
- `ios_xe = 3.7.5e`
- `ios_xe = 3.8.0e`
- `ios_xe = 3.8.1e`
- `ios_xe = 3.8.2e`
- `ios_xe = 3.8.3e`
- `ios_xe = 3.8.4e`
- `ios_xe = 3.8.5ae`
- `ios_xe = 3.8.5e`
- `ios_xe = 3.8.6e`
- `ios_xe = 3.8.7e`
- `ios_xe = 3.8.8e`
- `ios_xe = 3.8.9e`
- `ios_xe = 3.8.10e`
- `ios_xe = 3.9.0e`
- `ios_xe = 3.9.1e`
- `ios_xe = 3.9.2e`
- `ios_xe = 3.10.0ce`
- `ios_xe = 3.10.0e`
- `ios_xe = 3.10.1e`
- `ios_xe = 3.10.2e`
- `ios_xe = 3.10.3e`
- `ios_xe = 3.11.0e`
- `ios_xe = 3.11.1ae`
- `ios_xe = 3.11.1e`
- `ios_xe = 3.11.2e`
- `ios_xe = 3.11.3ae`
- `ios_xe = 3.11.3e`
- `ios_xe = 3.11.4e`
- `ios_xe = 3.11.5e`
- `ios_xe = 3.11.6e`
- `ios_xe = 3.11.7e`
- `ios_xe = 3.11.8e`
- `ios_xe = 3.11.9e`
- `ios_xe = 3.11.10e`
- `ios_xe = 3.11.11e`
- `ios_xe = 3.11.12e`
- `ios_xe = 3.14.0s`
- `ios_xe = 3.14.1s`
- `ios_xe = 3.14.2s`
- `ios_xe = 3.14.3s`
- `ios_xe = 3.14.4s`
- `ios_xe = 3.15.0s`
- `ios_xe = 3.15.1cs`
- `ios_xe = 3.15.1s`
- `ios_xe = 3.15.2s`
- `ios_xe = 3.15.3s`
- `ios_xe = 3.15.4s`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **cisco-sa-snmp-x4LPhte** · Cisco · affected: Cisco 1000 Series Integrated Services Routers, Cisco ASR 1000 Series Aggregation Services Routers, Cisco 4000 Series Integrated Services Routers, Cisco Integrated Services Virtual Router, Cisco Cloud Services Router 1000V Series, Cisco Catalyst IR1100 Rugged Series Routers, … · updated 2025-10-06 · [advisory](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snmp-x4LPhte)