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TI-2020-02831 Aliases CVE-2020-3273GHSA-27gx-92r4-wr88

Cisco Wireless LAN Controller 802.11 Generic Advertisement Service Denial of Service Vulnerability

Priority MEDIUM 41CWE-119Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-119 and the CVSS impact.

Summary

A vulnerability in the 802.11 Generic Advertisement Service (GAS) frame processing function of Cisco Wireless LAN Controller (WLC) Software could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS). The vulnerability is due to incomplete input validation of the 802.11 GAS frames that are processed by an affected device. An attacker could exploit this vulnerability by sending a crafted 802.11 GAS frame over the air to an access point (AP), and that frame would then be relayed to the affected WLC. Also, an attacker with Layer 3 connectivity to the WLC could exploit this vulnerability by sending a malicious 802.11 GAS payload in a Control and Provisioning of Wireless Access Points (CAPWAP) packet to the device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01274 70th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
CiscoCisco Wireless LAN Controller (WLC)all versions—No fix listedCNA
  • Cisco Wireless LAN Controller (WLC) VendorCisco Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 6

CPEVersionsRoleVendor
cpe:2.3:o:cisco:5508_wireless_controller_firmware:8.5\(151.0\):*:*:*:*:*:*:*8.5(151.0)VulnerableCisco
cpe:2.3:o:cisco:5508_wireless_controller_firmware:8.10\(204.92\):*:*:*:*:*:*:*8.10(204.92)VulnerableCisco
cpe:2.3:h:cisco:5508_wireless_controller:-:*:*:*:*:*:*:*not specified by NVDRunning onCisco
cpe:2.3:o:cisco:5520_wireless_controller_firmware:8.5\(151.0\):*:*:*:*:*:*:*8.5(151.0)VulnerableCisco
cpe:2.3:o:cisco:5520_wireless_controller_firmware:8.10\(204.92\):*:*:*:*:*:*:*8.10(204.92)VulnerableCisco
cpe:2.3:h:cisco:5520_wireless_controller:-:*:*:*:*:*:*:*not specified by NVDRunning onCisco
  • cpe:2.3:o:cisco:5508_wireless_controller_firmware:8.5\(151.0\):*:*:*:*:*:*:* Versions 8.5(151.0) Vulnerable ·Cisco
  • cpe:2.3:o:cisco:5508_wireless_controller_firmware:8.10\(204.92\):*:*:*:*:*:*:* Versions 8.10(204.92) Vulnerable ·Cisco
  • cpe:2.3:h:cisco:5508_wireless_controller:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
  • cpe:2.3:o:cisco:5520_wireless_controller_firmware:8.5\(151.0\):*:*:*:*:*:*:* Versions 8.5(151.0) Vulnerable ·Cisco
  • cpe:2.3:o:cisco:5520_wireless_controller_firmware:8.10\(204.92\):*:*:*:*:*:*:* Versions 8.10(204.92) Vulnerable ·Cisco
  • cpe:2.3:h:cisco:5520_wireless_controller:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-3273
  2. 2026-10-03 Alias added: GHSA-27gx-92r4-wr88

References

Advisory 1

  • TI-2020-02822 Cisco Wireless LAN Controller CAPWAP Denial of Service Vulnerability CVSS 3.1HIGH 7.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences