Detections
Analytics

Cisco IOS XE Software for WLC Wireless IPv6 Clients DoS (cisco-sa-wlc-wncd-p6Gvt6HL)

high Nessus Plugin ID 325417

Synopsis

The remote device is missing a vendor-supplied security patch

Description

According to its self-reported version, Cisco IOS-XE Software is affected by a vulnerability.

 - 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. (CVE-2025-20140)

Please see the included Cisco BIDs and Cisco Security Advisory for more information.

Solution

Upgrade to the relevant fixed version referenced in Cisco bug ID CSCwj16556

See Also

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwj16556

http://www.nessus.org/u?564dd2a1

http://www.nessus.org/u?ed1c37e2

Plugin Details

Severity: High

ID: 325417

File Name: cisco-sa-wlc-wncd-p6Gvt6HL-iosxe.nasl

Version: 1.1

Type: Combined

Family: CISCO

Published: 7/7/2026

Updated: 7/7/2026

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.3

Percentile: 50.87

CVSS v2

Risk Factor: Medium

Base Score: 6.1

Temporal Score: 4.5

Vector: CVSS2#AV:A/AC:L/Au:N/C:N/I:N/A:C

CVSS Score Source: CVE-2025-20140

CVSS v3

Risk Factor: High

Base Score: 7.4

Temporal Score: 6.4

Vector: CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:cisco:ios_xe

Required KB Items: Settings/ParanoidReport, Host/Cisco/IOS-XE/Version, Host/Cisco/IOS-XE/Model

Exploit Ease: No known exploits are available

Patch Publication Date: 5/7/2025

Vulnerability Publication Date: 5/7/2025

Reference Information

CVE: CVE-2025-20140

CWE: 789

CISCO-SA: cisco-sa-wlc-wncd-p6Gvt6HL

IAVA: 2025-A-0318

CISCO-BUG-ID: CSCwj16556