Headline
CVE-2023-20176: Cisco Security Advisory: Cisco Catalyst 9100 Access Points Denial of Service Vulnerability
A vulnerability in the networking component of Cisco access point (AP) software could allow an unauthenticated, remote attacker to cause a temporary disruption of service. This vulnerability is due to overuse of AP resources. An attacker could exploit this vulnerability by connecting to an AP on an affected device as a wireless client and sending a high rate of traffic over an extended period of time. A successful exploit could allow the attacker to cause the Datagram TLS (DTLS) session to tear down and reset, causing a denial of service (DoS) condition.
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 upgrade solution.
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 providers.
Fixed Releases
At the time of publication, the release information in the following table was accurate. See the Details section in the bug ID(s) at the top of this advisory for the most complete and current information.
The left column lists Cisco software releases, and the right column indicates whether a release was affected by the vulnerability described in this advisory and which release included the fix for this vulnerability.
The process to upgrade an AP requires administrators to upgrade the wireless controller to which the AP is registered. Customers are advised to upgrade to an appropriate fixed software release as indicated in the following table.
Cisco Catalyst 9800 Wireless Controller Software Release
First Fixed Release
16.12 and earlier
Migrate to a fixed release.
17.6
17.6.6
17.7
Migrate to a fixed release.
17.8
Migrate to a fixed release.
17.9
Not vulnerable.
The Cisco Product Security Incident Response Team (PSIRT) validates only the affected and fixed release information that is documented in this advisory.