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Cisco IOS XE Software for WLC Wireless IPv6 Clients Denial of Service Vulnerability

cisco-sa-wlc-wncd-p6Gvt6HL · High · Published · Updated

A vulnerability in the Wireless Network Control daemon (wncd) of Cisco IOS XE Software for Wireless LAN Controllers (WLCs) could allow an unauthenticated, adjacent wireless attacker to cause a denial of service (DoS) condition. This vulnerability is due to improper memory management. An attacker could exploit this vulnerability by sending a series of IPv6 network requests from an associated wireless IPv6 client to an affected device. To associate a client to a device, an attacker may first need to authenticate to the network, or associate freely in the case of a configured open network. A successful exploit could allow the attacker to cause the wncd process to consume available memory and eventually cause the device to stop responding, resulting in a DoS condition. 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:https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-wlc-wncd-p6Gvt6HL This advisory is part of the May 2025 release of the Cisco IOS and IOS XE Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see Cisco Event Response: May 2025 Semiannual Cisco IOS and IOS XE Software Security Advisory Bundled Publication.

Cisco advisory · CSAF JSON

Workarounds

There are no workarounds that address this vulnerability.

However, customers can disable wireless IPv6 clients by issuing the no wireless ipv6 client command if the feature is not in use.

While this mitigation has been deployed and was proven successful in a test environment, customers should determine the applicability and effectiveness in their own environment and under their own use conditions. Customers should be aware that any workaround or mitigation that is implemented may negatively impact the functionality or performance of their network based on intrinsic customer deployment scenarios and limitations. Customers should not deploy any workarounds or mitigations before first evaluating the applicability to their own environment and any impact to such environment.

CVEsCVE-2025-20140
Cisco Bug IDsCSCwj16556
CVSS ScoreBase 7.4
Base 7.4 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:X/RL:X/RC:X
Product Names From Source
Cisco IOS XE Software 16.4.1, Cisco IOS XE Software 16.4.2, Cisco IOS XE Software 16.4.3, Cisco IOS XE Software 16.5.1, Cisco IOS XE Software 16.5.1a, Cisco IOS XE Software 16.5.1b, Cisco IOS XE Software 16.5.2, Cisco IOS XE Software 16.5.3, Cisco IOS XE Software 16.6.1, Cisco IOS XE Software 16.6.2, Cisco IOS XE Software 16.6.3, Cisco IOS XE Software 16.6.4, Cisco IOS XE Software 16.6.5, Cisco IOS XE Software 16.6.4s, Cisco IOS XE Software 16.6.4a, Cisco IOS XE Software 16.6.5a, Cisco IOS XE Software 16.6.6, Cisco IOS XE Software 16.6.5b, Cisco IOS XE Software 16.6.7, Cisco IOS XE Software 16.6.7a, Cisco IOS XE Software 16.6.8, Cisco IOS XE Software 16.6.9, Cisco IOS XE Software 16.6.10, Cisco IOS XE Software 16.7.1, Cisco IOS XE Software 16.7.1a, Cisco IOS XE Software 16.7.1b, Cisco IOS XE Software 16.7.2, Cisco IOS XE Software 16.7.3, Cisco IOS XE Software 16.7.4, Cisco IOS XE Software 16.8.1, Cisco IOS XE Software 16.8.1a, Cisco IOS XE Software 16.8.1b, Cisco IOS XE Software 16.8.1s, Cisco IOS XE Software 16.8.1c, Cisco IOS XE Software 16.8.1d, Cisco IOS XE Software 16.8.2, Cisco IOS XE Software 16.8.1e, Cisco IOS XE Software 16.8.3, Cisco IOS XE Software 16.9.1, Cisco IOS XE Software 16.9.2, Cisco IOS XE Software 16.9.1a, Cisco IOS XE Software 16.9.1b, Cisco IOS XE Software 16.9.1s, Cisco IOS XE Software 16.9.1c, Cisco IOS XE Software 16.9.1d, Cisco IOS XE Software 16.9.3, Cisco IOS XE Software 16.9.2a, Cisco IOS XE Software 16.9.2s, Cisco IOS XE Software 16.9.3h, Cisco IOS XE Software 16.9.4, Cisco IOS XE Software 16.9.3s, Cisco IOS XE Software 16.9.3a, Cisco IOS XE Software 16.9.4c, Cisco IOS XE Software 16.9.5, Cisco IOS XE Software 16.9.5f, Cisco IOS XE Software 16.9.6, Cisco IOS XE Software 16.9.7, Cisco IOS XE Software 16.9.8, Cisco IOS XE Software 16.9.8a, Cisco IOS XE Software 16.9.8b, Cisco IOS XE Software 16.10.1, Cisco IOS XE Software 16.10.1a, Cisco IOS XE Software 16.10.1b, Cisco IOS XE Software 16.10.1s, Cisco IOS XE Software 16.10.1c, Cisco IOS XE Software 16.10.1e, Cisco IOS XE Software 16.10.1d, Cisco IOS XE Software 16.10.2, Cisco IOS XE Software 16.10.1f, Cisco IOS XE Software 16.10.1g, Cisco IOS XE Software 16.10.3, Cisco IOS XE Software 16.11.1, Cisco IOS XE Software 16.11.1a, Cisco IOS XE Software 16.11.1b, Cisco IOS XE Software 16.11.2, Cisco IOS XE Software 16.11.1s, Cisco IOS XE Software 16.11.1c, Cisco IOS XE Software 16.12.1, Cisco IOS XE Software 16.12.1s, Cisco IOS XE Software 16.12.1a, Cisco IOS XE Software 16.12.1c, Cisco IOS XE Software 16.12.1w, Cisco IOS XE Software 16.12.2, Cisco IOS XE Software 16.12.1y, Cisco IOS XE Software 16.12.2a, Cisco IOS XE Software 16.12.3, Cisco IOS XE Software 16.12.8, Cisco IOS XE Software 16.12.2s, Cisco IOS XE Software 16.12.1x, Cisco IOS XE Software 16.12.1t, Cisco IOS XE Software 16.12.2t, Cisco IOS XE Software 16.12.4, Cisco IOS XE Software 16.12.3s, Cisco IOS XE Software 16.12.1z, Cisco IOS XE Software 16.12.3a, Cisco IOS XE Software 16.12.4a, Cisco IOS XE Software 16.12.5, Cisco IOS XE Software 16.12.6, Cisco IOS XE Software 16.12.1z1, Cisco IOS XE Software 16.12.5a, Cisco IOS XE Software 16.12.5b, Cisco IOS XE Software 16.12.1z2, Cisco IOS XE Software 16.12.6a, Cisco IOS XE Software 16.12.7, Cisco IOS XE Software 16.12.9, Cisco IOS XE Software 16.12.10, Cisco IOS XE Software 16.12.10a, Cisco IOS XE Software 16.12.11, Cisco IOS XE Software 16.12.12, Cisco IOS XE Software 16.12.15, Cisco IOS XE Software 17.1.1, Cisco IOS XE Software 17.1.1a, Cisco IOS XE Software 17.1.1s, Cisco IOS XE Software 17.1.2, Cisco IOS XE Software 17.1.1t, Cisco IOS XE Software 17.1.3, Cisco IOS XE Software 17.2.1, Cisco IOS XE Software 17.2.1r, Cisco IOS XE Software 17.2.1a, Cisco IOS XE Software 17.2.1v, Cisco IOS XE Software 17.2.2, Cisco IOS XE Software 17.2.3, Cisco IOS XE Software 17.3.1, Cisco IOS XE Software 17.3.2, Cisco IOS XE Software 17.3.3, Cisco IOS XE Software 17.3.1a, Cisco IOS XE Software 17.3.1w, Cisco IOS XE Software 17.3.2a, Cisco IOS XE Software 17.3.1x, Cisco IOS XE Software 17.3.1z, Cisco IOS XE Software 17.3.3a, Cisco IOS XE Software 17.3.4, Cisco IOS XE Software 17.3.5, Cisco IOS XE Software 17.3.4a, Cisco IOS XE Software 17.3.6, Cisco IOS XE Software 17.3.4b, Cisco IOS XE Software 17.3.4c, Cisco IOS XE Software 17.3.5a, Cisco IOS XE Software 17.3.5b, Cisco IOS XE Software 17.3.7, Cisco IOS XE Software 17.3.8, Cisco IOS XE Software 17.3.8a, Cisco IOS XE Software 17.4.1, Cisco IOS XE Software 17.4.2, Cisco IOS XE Software 17.4.1a, Cisco IOS XE Software 17.4.1b, Cisco IOS XE Software 17.4.1c, Cisco IOS XE Software 17.4.2a, Cisco IOS XE Software 17.5.1, Cisco IOS XE Software 17.5.1a, Cisco IOS XE Software 17.5.1b, Cisco IOS XE Software 17.5.1c, Cisco IOS XE Software 17.6.1, Cisco IOS XE Software 17.6.2, Cisco IOS XE Software 17.6.1w, Cisco IOS XE Software 17.6.1a, Cisco IOS XE Software 17.6.1x, Cisco IOS XE Software 17.6.3, Cisco IOS XE Software 17.6.1y, Cisco IOS XE Software 17.6.1z, Cisco IOS XE Software 17.6.3a, Cisco IOS XE Software 17.6.4, Cisco IOS XE Software 17.6.1z1, Cisco IOS XE Software 17.6.5, Cisco IOS XE Software 17.6.6, Cisco IOS XE Software 17.6.6a, Cisco IOS XE Software 17.6.5a, Cisco IOS XE Software 17.6.7, Cisco IOS XE Software 17.6.8, Cisco IOS XE Software 17.6.8a, Cisco IOS XE Software 17.7.1, Cisco IOS XE Software 17.7.1a, Cisco IOS XE Software 17.7.1b, Cisco IOS XE Software 17.7.2, Cisco IOS XE Software 17.10.1, Cisco IOS XE Software 17.10.1a, Cisco IOS XE Software 17.10.1b, Cisco IOS XE Software 17.8.1, Cisco IOS XE Software 17.8.1a, Cisco IOS XE Software 17.9.1, Cisco IOS XE Software 17.9.1w, Cisco IOS XE Software 17.9.2, Cisco IOS XE Software 17.9.1a, Cisco IOS XE Software 17.9.1x, Cisco IOS XE Software 17.9.1y, Cisco IOS XE Software 17.9.3, Cisco IOS XE Software 17.9.2a, Cisco IOS XE Software 17.9.1x1, Cisco IOS XE Software 17.9.3a, Cisco IOS XE Software 17.9.4, Cisco IOS XE Software 17.9.1y1, Cisco IOS XE Software 17.9.5, Cisco IOS XE Software 17.9.4a, Cisco IOS XE Software 17.9.5a, Cisco IOS XE Software 17.9.5b, Cisco IOS XE Software 17.9.5c, Cisco IOS XE Software 17.9.5d, Cisco IOS XE Software 17.9.5e, Cisco IOS XE Software 17.9.5f, Cisco IOS XE Software 17.11.1, Cisco IOS XE Software 17.11.1a, Cisco IOS XE Software 17.12.1, Cisco IOS XE Software 17.12.1w, Cisco IOS XE Software 17.12.1a, Cisco IOS XE Software 17.12.1x, Cisco IOS XE Software 17.12.2, Cisco IOS XE Software 17.12.3, Cisco IOS XE Software 17.12.2a, Cisco IOS XE Software 17.12.1y, Cisco IOS XE Software 17.12.1z, Cisco IOS XE Software 17.12.3a, Cisco IOS XE Software 17.12.1z1, Cisco IOS XE Software 17.13.1, Cisco IOS XE Software 17.13.1a, Cisco IOS XE Software 17.14.1, Cisco IOS XE Software 17.14.1a, Cisco IOS XE Software 17.11.99SW, Cisco IOS, Cisco IOS XE Software

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