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AUSCERT External Security Bulletin Redistribution
Cisco Wireless LAN Controller AireOS Software FIPS Mode
Denial of Service Vulnerability
29 September 2022
AusCERT Security Bulletin Summary
Product: Cisco Wireless LAN Controller
Publisher: Cisco Systems
Operating System: Cisco
CVE Names: CVE-2022-20769
Comment: CVSS (Max): 7.4 CVE-2022-20769 (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H)
CVSS Source: Cisco Systems
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Cisco Wireless LAN Controller AireOS Software FIPS Mode Denial of Service
Advisory ID: cisco-sa-wlc-dos-mKGRrsCB
First Published: 2022 September 28 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCwa40778
CVE Names: CVE-2022-20769
o A vulnerability in the authentication functionality of Cisco Wireless LAN
Controller (WLC) AireOS Software could allow an unauthenticated, adjacent
attacker to cause a denial of service (DoS) condition on an affected
This vulnerability is due to insufficient error validation. An attacker
could exploit this vulnerability by sending crafted packets to an affected
device. A successful exploit could allow the attacker to cause the wireless
LAN controller to crash, resulting in a DoS condition.
Note : This vulnerability affects only devices that have Federal
Information Processing Standards (FIPS) mode enabled.
Cisco has released software updates that address this vulnerability. There
are no workarounds that address this vulnerability.
This advisory is available at the following link:
o Vulnerable Products
This vulnerability affects Cisco devices if they are running a vulnerable
release of Cisco WLC AireOS Software and they have FIPS mode enabled.
For information about which Cisco software releases are vulnerable, see the
Fixed Software section of this advisory.
Determine Whether FIPS Mode is Enabled
To determine whether FIPS mode is enabled, use the show switchconfig CLI
command. If FIPS prerequisite features is enabled, as shown in the
following example, the device is considered vulnerable:
wlc> show switchconfig
802.3x Flow Control Mode......................... Disable
FIPS prerequisite features....................... Enabled
WLANCC prerequisite features..................... Enabled
UCAPL prerequisite features...................... Disabled
secret obfuscation............................... Enabled
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by this vulnerability.
Cisco has confirmed that this vulnerability does not affect the following
Catalyst 9800-CL Wireless Controllers for Cloud
Catalyst 9800 Embedded Wireless Controllers for Catalyst 9300, 9400,
and 9500 Series Switches
Catalyst 9800 Series Wireless Controllers
Embedded Wireless Controllers on Catalyst Access Points
o There are no workarounds that address this vulnerability.
o Cisco has released free software updates that address the vulnerability
described in this advisory. Customers with service contracts that entitle
them to regular software updates should obtain security fixes through their
usual update channels.
Customers may only install and expect support for software versions and
feature sets for which they have purchased a license. By installing,
downloading, accessing, or otherwise using such software upgrades,
customers agree to follow the terms of the Cisco software license:
Additionally, customers may only download software for which they have a
valid license, procured from Cisco directly, or through a Cisco authorized
reseller or partner. In most cases this will be a maintenance upgrade to
software that was previously purchased. Free security software updates do
not entitle customers to a new software license, additional software
feature sets, or major revision upgrades.
The Cisco Support and Downloads page on Cisco.com provides information
about licensing and downloads. This page can also display customer device
support coverage for customers who use the My Devices tool.
When considering software upgrades , customers are advised to regularly
consult the advisories for Cisco products, which are available from the
Cisco Security Advisories page , to determine exposure and a complete
In all cases, customers should ensure that the devices to be upgraded
contain sufficient memory and confirm that current hardware and software
configurations will continue to be supported properly by the new release.
If the information is not clear, customers are advised to contact the Cisco
Technical Assistance Center (TAC) or their contracted maintenance
Customers Without Service Contracts
Customers who purchase directly from Cisco but do not hold a Cisco service
contract and customers who make purchases through third-party vendors but
are unsuccessful in obtaining fixed software through their point of sale
should obtain upgrades by contacting the Cisco TAC: https://www.cisco.com/c
Customers should have the product serial number available and be prepared
to provide the URL of this advisory as evidence of entitlement to a free
In the following table(s), the left column lists Cisco software releases.
The center column indicates whether a release is affected by the
vulnerability described in this advisory and the first release that
includes the fix for this vulnerability. The right column indicates whether
a release is affected by all the vulnerabilities described in this bundle
of advisories and which release includes fixes for those vulnerabilities.
Cisco WLC AireOS Release First Fixed Release
8.9 and earlier Migrate to a fixed release.
8.10 and later 126.96.36.199
The Cisco Product Security Incident Response Team (PSIRT) validates only
the affected and fixed release information that is documented in this
Exploitation and Public Announcements
o The Cisco PSIRT is not aware of any public announcements or malicious use
of the vulnerability that is described in this advisory.
o This vulnerability was found during the resolution of a Cisco TAC support
Cisco Security Vulnerability Policy
o To learn about Cisco security vulnerability disclosure policies and
publications, see the Security Vulnerability Policy . This document also
contains instructions for obtaining fixed software and receiving security
vulnerability information from Cisco.
Related to This Advisory
o September-2022-WLC Bundle
| Version | Description | Section | Status | Date |
| 1.0 | Initial public release. | - | Final | 2022-SEP-28 |
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