CVE-2025-20140: cisco cisco ios xe software

Vulnerability summary

CVE-2025-20140 is a high (CVSS 7.4) vulnerability in cisco cisco ios xe software. EPSS estimates a 0.25% chance of exploitation in the next 30 days, higher than 15.3% of scored vulnerabilities.

Timeline

1. 07-05-2025
   PublishedVulnerability first disclosed.
2. 07-05-2025
   Last modifiedVulnerability information updated.

Description

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.

• CWE-789Memory Allocation with Excessive Size ValueThe product allocates memory based on an untrusted, large size value, but it does not ensure that the size is within expected limits, allowing arbitrary amounts of memory to be allocated.