What’s Vulnerable › Vulnerabilities

CVE-2019-15276: Cisco Wireless LAN Controller HTTP Parsing Engine Denial of Service Vulnerability

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 46.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2019-11-26 · updated 2026-06-17
• Weakness: CWE-20

Description

A vulnerability in the web interface of Cisco Wireless LAN Controller Software could allow a low-privileged, authenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability exists due to a failure of the HTTP parsing engine to handle specially crafted URLs. An attacker could exploit this vulnerability by authenticating with low privileges to an affected controller and submitting the crafted URL to the web interface of the affected device. Conversely, an unauthenticated attacker could exploit this vulnerability by persuading a user of the web interface to click the crafted URL. A successful exploit could allow the attacker to cause an unexpected restart of the device, resulting in a DoS condition.

Affected products

• Cisco Wireless LAN Controller (WLC): from 8.4 before 8.10 — fixed in 8.10

How to fix

Upgrade to a fixed version: Cisco Wireless LAN Controller (WLC) 8.10. Check the vendor advisory for mitigations.

References

• http://packetstormsecurity.com/files/155554/Cisco-WLC-2504-8.9-Denial-Of-Service.html
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20191106-wlc-dos
• http://packetstormsecurity.com/files/155554/Cisco-WLC-2504-8.9-Denial-Of-Service.html
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20191106-wlc-dos

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