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Vendor advisorySeverity 7.4 high
Cisco Aironet Access Points WLAN Control Protocol Packet Buffer Leak Denial of Service Vulnerability
cisco-sa-airo-wpa-pktleak-dos-uSTyGrL · Cisco · September 22, 2021
Summary
A vulnerability in the WLAN Control Protocol (WCP) implementation for Cisco Aironet Access Point (AP) software could allow an unauthenticated, adjacent attacker to cause a reload of an affected device, resulting in a denial of service (DoS) condition.
This vulnerability is due to incorrect error handling when an affected device receives an unexpected 802.11 frame. An attacker could exploit this vulnerability by sending certain 802.11 frames over the wireless network to an interface on an affected AP. A successful exploit could allow the attacker to cause a packet buffer leak. This could eventually result in buffer allocation failures, which would trigger a reload of the affected device.
Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.
From Cisco (vendor's own words, quoted), quoted as published. Check the source before acting.
What to do
Cisco has released software updates that address this vulnerability.
Vendor fix or mitigation, quoted from the advisory.
Each CVE in this advisory
| CVE | Severity | Known exploited | Exploit likelihood |
|---|---|---|---|
| CVE-2021-34740 | 7.4 high | No | 0.4% |
Severity from the advisory (CVSS), known exploitation from CISA's catalog, exploit likelihood from EPSS (next 30 days).
Affected products
| Vendor | Product |
|---|---|
| Cisco | Cisco Aironet Access Point Software |
| Cisco | Cisco Aironet Access Point Software (IOS XE Controller) |
Why it's on these mode pages
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Change history
- September 22, 2021: Initial public release.
- November 9, 2026: First collected by Watch
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