{"id":87109,"date":"2026-06-13T00:59:10","date_gmt":"2026-06-13T00:59:10","guid":{"rendered":""},"modified":"-0001-11-30T00:00:00","modified_gmt":"-0001-11-30T00:00:00","slug":"cve-2025-20140-cisco-ios-xe-software-wireless-network-control-daemon-vulnerability","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-20140-cisco-ios-xe-software-wireless-network-control-daemon-vulnerability\/","title":{"rendered":"CVE-2025-20140: Cisco IOS XE Software Wireless Network Control Daemon Vulnerability<\/strong>"},"content":{"rendered":"

Overview<\/strong><\/p>\n

The following report provides a detailed analysis of a notable cybersecurity vulnerability identified as CVE-2025-20140. This vulnerability resides in the Wireless Network Control daemon (wncd) of Cisco IOS XE Software for Wireless LAN Controllers. If exploited, it could lead to severe consequences such as a denial of service (DoS) condition, potential system compromise, or data leakage, affecting various businesses and organizations relying on Cisco’s wireless networking solutions.<\/p>\n

Vulnerability Summary<\/strong><\/p>\n

CVE ID: CVE-2025-20140
\nSeverity: High (7.4)
\nAttack Vector: Network
\nPrivileges Required: Low
\nUser Interaction: None
\nImpact: Denial of Service (DoS), potential system compromise, or data leakage<\/p>\n

Affected Products<\/strong><\/p>\n

Product | Affected Versions<\/p>\n

Cisco IOS XE Software | All versions prior to the patch<\/p>\n

How the Exploit Works<\/strong><\/p>\n

The vulnerability arises from improper memory management within the Wireless Network Control daemon (wncd) of Cisco IOS XE Software. An attacker can exploit this vulnerability by sending a series of IPv6 network requests from an associated wireless IPv6 client to an affected device. If successful, this exploit could cause the wncd process to consume all available memory, leading to the device stopping its response and hence resulting in a denial of service (DoS) condition.<\/p>\n

Conceptual Example Code<\/strong><\/p>\n

Below is a conceptual example of how the vulnerability might be exploited. The attacker would send a series of IPv6 network requests, each potentially causing increased memory consumption on the targeted device.<\/p>\n

# Attacker's device (IPv6 client)\nfor i in {1..100000}\ndo\n# Send network request to the targeted device\ncurl -6 http:\/\/[target_device_ipv6_address]\/request_endpoint\ndone<\/code><\/pre>\n
Please note that this is a conceptual representation and does not represent an actual exploit code.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview The following report provides a detailed analysis of a notable cybersecurity vulnerability identified as CVE-2025-20140. This vulnerability resides in the Wireless Network Control daemon (wncd) of Cisco IOS XE Software for Wireless LAN Controllers. If exploited, it could lead to severe consequences such as a denial of service (DoS) condition, potential system compromise, or […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[],"tags":[],"vendor":[],"product":[],"attack_vector":[],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-87109","post","type-post","status-publish","format-standard","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t