CVE-2018-0441: Cisco IOS Access Points Software 802.11r Fast Transition Denial of Service Vulnerability

Severity: high (CVSS 7.4 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2018-10-17 · updated 2026-06-17
Weakness: CWE-400

Description

A vulnerability in the 802.11r Fast Transition feature set of Cisco IOS Access Points (APs) Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to a corruption of certain timer mechanisms triggered by specific roaming events. This corruption will eventually cause a timer crash. An attacker could exploit this vulnerability by sending malicious reassociation events multiple times to the same AP in a short period of time, causing a DoS condition on the affected AP.

Affected products

Cisco Access Points: before 8.3.140.0; from 8.4 before 8.5.110.0; 8.0(140.0), 8.2(141.0), 8.2(151.0), 8.3(102.0), 8.3(112.0), 8.3(114.74) (+1) — fixed in 8.3.140.0, 8.5.110.0

How to fix

Upgrade to a fixed version: Cisco Access Points 8.3.140.0, 8.5.110.0. Check the vendor advisory for mitigations.

References

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