{"id":69809,"date":"2025-09-02T06:26:03","date_gmt":"2025-09-02T06:26:03","guid":{"rendered":""},"modified":"2025-09-07T13:27:42","modified_gmt":"2025-09-07T19:27:42","slug":"cve-2025-9392-critical-buffer-overflow-vulnerability-in-linksys-routers","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-9392-critical-buffer-overflow-vulnerability-in-linksys-routers\/","title":{"rendered":"CVE-2025-9392: Critical Buffer Overflow Vulnerability in Linksys Routers<\/strong>"},"content":{"rendered":"

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

In the ever-evolving world of cybersecurity, vulnerabilities are frequently being discovered and exploited. One such vulnerability, CVE-2025-9392, has been identified in multiple models of Linksys routers. This vulnerability, if exploited, could lead to severe consequences, including system compromise<\/a> or data leakage. This blog post aims to explain the vulnerability<\/a> details, how it affects the Linksys routers, and the mitigation steps to guard against potential attacks.
\nThe vulnerability in question targets the function \u2018qosClassifier\u2019 of the file \u2018\/goform\/qosClassifier\u2019 in several Linksys<\/a> routers. This stack-based buffer overflow<\/a> can be triggered remotely, and the exploit has been publicly disclosed. Despite being informed, the vendor has failed to respond, escalating the risk associated with this vulnerability<\/a>.<\/p>\n

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

CVE ID: CVE-2025-9392
\nSeverity: High (8.8 CVSS Score)
\nAttack Vector: Network
\nPrivileges Required: None
\nUser Interaction: None
\nImpact: System compromise or data<\/a> leakage<\/p>\n

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

Product | Affected Versions<\/p>\n

Linksys RE6250 | 1.0.013.001, 1.0.04.001, 1.0.04.002
\nLinksys RE6300 | 1.0.013.001, 1.0.04.001, 1.0.04.002
\nLinksys RE6350 | 1.0.013.001, 1.0.04.001, 1.0.04.002
\nLinksys RE6500 | 1.0.013.001, 1.0.04.001, 1.0.04.002
\nLinksys RE7000 | 1.1.05.003
\nLinksys RE9000 | 1.2.07.001<\/p>\n

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

The exploit works by manipulating the arguments ‘dir\/sFromPort\/sToPort\/dFromPort\/dToPort\/protocol\/layer7\/dscp\/remark_dscp’ in the ‘qosClassifier’ function of the file ‘\/goform\/qosClassifier’. This manipulation causes a stack-based buffer overflow<\/a>. A buffer overflow<\/a> occurs when more data is put into a buffer than it can hold. In this case, the overflow could lead to a system<\/a> crash or allow the execution of arbitrary code, potentially compromising the system.<\/p>\n

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

This conceptual example illustrates how an attacker might exploit this vulnerability<\/a>:<\/p>\n

POST \/goform\/qosClassifier HTTP\/1.1\nHost: target.example.com\nContent-Type: application\/json\n{\n\"dir\": \"excessive_data\",\n\"sFromPort\": \"excessive_data\",\n\"sToPort\": \"excessive_data\",\n\"dFromPort\": \"excessive_data\",\n\"dToPort\": \"excessive_data\",\n\"protocol\": \"excessive_data\",\n\"layer7\": \"excessive_data\",\n\"dscp\": \"excessive_data\",\n\"remark_dscp\": \"excessive_data\"\n}<\/code><\/pre>\n
The ‘excessive_data’ could be a long string of characters designed to overflow the buffer<\/a>. Successful exploitation could lead to the execution of malicious code<\/a> with the same privileges as the process being exploited.
\nAs a mitigation measure, it is recommended to apply any available vendor patches or use Web Application Firewall (WAF) or Intrusion Detection System (IDS) as temporary mitigation. Keep in mind that these are temporary solutions until the vendor provides a permanent fix.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview In the ever-evolving world of cybersecurity, vulnerabilities are frequently being discovered and exploited. One such vulnerability, CVE-2025-9392, has been identified in multiple models of Linksys routers. This vulnerability, if exploited, could lead to severe consequences, including system compromise or data leakage. This blog post aims to explain the vulnerability details, how it affects 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-69809","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