CVE-2018-0442: Cisco Wireless LAN Controller Software Control and Provisioning of Wireless Access Points Protocol Information Disclosure Vulnerability

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 3.3% 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-200

Description

A vulnerability in the Control and Provisioning of Wireless Access Points (CAPWAP) protocol component of Cisco Wireless LAN Controller (WLC) Software could allow an unauthenticated, remote attacker to retrieve memory contents, which could lead to the disclosure of confidential information. The vulnerability is due to insufficient condition checks in the part of the code that handles CAPWAP keepalive requests. An attacker could exploit this vulnerability by sending a crafted CAPWAP keepalive packet to a vulnerable Cisco WLC device. A successful exploit could allow the attacker to retrieve the contents of device memory, which could lead to the disclosure of confidential information.

Affected products

Cisco Wireless LAN Controller (WLC): before 8.2.170.0; from 8.3 before 8.3.140.0; from 8.4 before 8.5.110.0; from 8.6 before 8.6.101.0; from 8.7 before 8.7.102.0 — fixed in 8.2.170.0, 8.3.140.0, 8.5.110.0, 8.6.101.0, 8.7.102.0

How to fix

Upgrade to a fixed version: Cisco Wireless LAN Controller (WLC) 8.2.170.0, 8.3.140.0, 8.5.110.0, 8.6.101.0. Check the vendor advisory for mitigations.

References

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