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CVE-2020-3262: Cisco Wireless LAN Controller CAPWAP Denial of Service Vulnerability

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-04-15 · updated 2026-06-17
• Weakness: CWE-20

Description

A vulnerability in the Control and Provisioning of Wireless Access Points (CAPWAP) protocol handler of Cisco Wireless LAN Controller (WLC) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to insufficient validation of CAPWAP packets. An attacker could exploit this vulnerability by sending a malformed CAPWAP packet to an affected device. A successful exploit could allow the attacker to cause the affected device to restart, resulting in a DoS condition.

Affected products

• Cisco 5508 Wireless Controller Firmware: 8.8(120.0)
• Cisco 5520 Wireless Controller Firmware: 8.8(120.0)

References

• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-wlc-capwap-dos-Y2sD9uEw
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-wlc-capwap-dos-Y2sD9uEw

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