CVE-2024-20271

Severity: high (CVSS 8.6 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-03-27 · updated 2026-06-17
Weakness: CWE-20

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.

Affected products

Cisco Business Access Points: before 10.9.1.0; before 10.6.2.0 — fixed in 10.6.2.0, 10.9.1.0
Cisco IOS XE: before 17.3.8; from 17.4 before 17.6.6; from 17.7 before 17.9.5; from 17.10 before 17.12.2 — fixed in 17.12.2, 17.3.8, 17.6.6, 17.9.5
Cisco Wireless LAN Controller (WLC): before 8.10.190.0 — fixed in 8.10.190.0

How to fix

Upgrade to a fixed version: Cisco Business Access Points 10.6.2.0, 10.9.1.0; Cisco IOS XE 17.12.2, 17.3.8, 17.6.6, 17.9.5; Cisco Wireless LAN Controller (WLC) 8.10.190.0. Check the vendor advisory for mitigations.

References

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