{"id":56844,"date":"2025-07-03T09:12:36","date_gmt":"2025-07-03T09:12:36","guid":{"rendered":""},"modified":"2025-09-27T07:38:37","modified_gmt":"2025-09-27T13:38:37","slug":"cve-2025-6752-critical-stack-based-buffer-overflow-vulnerability-in-linksys-routers","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-6752-critical-stack-based-buffer-overflow-vulnerability-in-linksys-routers\/","title":{"rendered":"CVE-2025-6752: Critical Stack-Based Buffer Overflow Vulnerability in Linksys Routers<\/strong>"},"content":{"rendered":"

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

A critical security vulnerability, identified as CVE-2025-6752, has been discovered affecting several Linksys router models, including WRT1900ACS, EA7200, EA7450, and EA7500 up to 20250619. This vulnerability has been classified as critical due to its potential to compromise systems and leak data. This vulnerability is particularly concerning as it affects<\/a> the function SetDefaultConnectionService of the file \/upnp\/control\/Layer3Forwarding of the IGD component and can be exploited remotely. The exploit is publicly disclosed, and the vendor has yet to respond.<\/p>\n

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

CVE ID: CVE-2025-6752
\nSeverity: Critical (8.8 CVSS score)
\nAttack Vector: Remote
\nPrivileges Required: None
\nUser Interaction: None
\nImpact: Potential system<\/a> compromise and data leakage<\/p>\n

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

Product | Affected Versions<\/p>\n

Linksys WRT1900ACS | Up to 20250619
\nLinksys EA7200 | Up to 20250619
\nLinksys EA7450 | Up to 20250619
\nLinksys EA7500 | Up to 20250619<\/p>\n

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

The vulnerability comes into play when an attacker manipulates the argument NewDefaultConnectionService, leading to a stack-based buffer overflow<\/a>. This overflow then can cause the system to crash or, worse, allow the attacker to execute arbitrary code<\/a> on the system. This exploitation can be initiated remotely<\/a>, making it a significant threat to any unprotected networks.<\/p>\n

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

Below is a conceptual example of how an HTTP request exploiting this vulnerability<\/a> might look:<\/p>\n

POST \/upnp\/control\/Layer3Forwarding HTTP\/1.1\nHost: target_router_IP\nContent-Type: application\/xml; charset=\"utf-8\"\nSOAPAction: \"urn:schemas-upnp-org:service:Layer3Forwarding:1#SetDefaultConnectionService\"\n\n\n\n\n[malicious_code]<\/NewDefaultConnectionService>\n<\/u:SetDefaultConnectionService>\n<\/s:Body>\n<\/s:Envelope><\/code><\/pre>\n
Recommended Mitigation<\/strong><\/p>\n
Until the vendor releases a patch to fix this vulnerability<\/a>, users are advised to apply a Web Application Firewall (WAF) or Intrusion Detection System (IDS) as a temporary mitigation. These solutions can help detect and block malicious activities related to this vulnerability<\/a>. Furthermore, users should regularly monitor their network<\/a> for any unusual activities.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview A critical security vulnerability, identified as CVE-2025-6752, has been discovered affecting several Linksys router models, including WRT1900ACS, EA7200, EA7450, and EA7500 up to 20250619. This vulnerability has been classified as critical due to its potential to compromise systems and leak data. This vulnerability is particularly concerning as it affects the function SetDefaultConnectionService of the […]<\/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":[1],"tags":[],"vendor":[],"product":[],"attack_vector":[86],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-56844","post","type-post","status-publish","format-standard","hentry","category-uncategorized","attack_vector-buffer-overflow"],"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
In this example, the [malicious_code] placeholder would be replaced with the actual code designed to overflow the buffer<\/a>.<\/p>\n