CVE-2024-20354

Severity: high (CVSS 7.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% 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-460

Description

A vulnerability in the handling of encrypted wireless frames of Cisco Aironet Access Point (AP) Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on the affected device. This vulnerability is due to incomplete cleanup of resources when dropping certain malformed frames. An attacker could exploit this vulnerability by connecting as a wireless client to an affected AP and sending specific malformed frames over the wireless connection. A successful exploit could allow the attacker to cause degradation of service to other clients, which could potentially lead to a complete DoS condition.

Affected products

Cisco IOS XE: from 16.12.4a before 17.1.0; from 17.3.0 before 17.3.9; from 17.4.0 before 17.6.7; from 17.7.0 before 17.9.5; from 17.10.0 before 17.12.2 — fixed in 17.1.0, 17.12.2, 17.3.9, 17.6.7, 17.9.5
Cisco Wireless LAN Controller (WLC): from 8.5.171.0 before 8.6.0.0; from 8.10.130.0 before 8.10.190.81 — fixed in 8.10.190.81, 8.6.0.0

How to fix

Upgrade to a fixed version: Cisco IOS XE 17.1.0, 17.12.2, 17.3.9, 17.6.7; Cisco Wireless LAN Controller (WLC) 8.10.190.81, 8.6.0.0. Check the vendor advisory for mitigations.

References

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