{"id":64076,"date":"2025-08-15T16:25:49","date_gmt":"2025-08-15T16:25:49","guid":{"rendered":""},"modified":"2025-09-15T00:31:11","modified_gmt":"2025-09-15T06:31:11","slug":"cve-2025-8817-critical-stack-based-buffer-overflow-vulnerability-in-linksys-devices","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-8817-critical-stack-based-buffer-overflow-vulnerability-in-linksys-devices\/","title":{"rendered":"CVE-2025-8817: Critical Stack-Based Buffer Overflow Vulnerability in Linksys Devices<\/strong>"},"content":{"rendered":"

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

The CVE-2025-8817 vulnerability, identified in a range of Linksys devices, presents a serious threat to data security and system integrity. This vulnerability affects Linksys RE6250, RE6300, RE6350, RE6500, RE7000, and RE9000 devices up to version 20250801. The vulnerability, which lies in the functionality of the setLan file, can be exploited remotely, potentially leading to system compromise<\/a> or data leakage. The severity of this vulnerability<\/a> underscores the need for immediate action from both users and the vendor.<\/p>\n

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

CVE ID: CVE-2025-8817
\nSeverity: Critical (CVSS: 8.8)
\nAttack Vector: Remote
\nPrivileges Required: None
\nUser Interaction: None
\nImpact: Potential system compromise or data<\/a> leakage<\/p>\n

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

Product | Affected Versions<\/p>\n

Linksys RE6250 | Up to 20250801
\nLinksys RE6300 | Up to 20250801
\nLinksys RE6350 | Up to 20250801
\nLinksys RE6500 | Up to 20250801
\nLinksys RE7000 | Up to 20250801
\nLinksys RE9000 | Up to 20250801<\/p>\n

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

The vulnerability stems from a stack-based buffer overflow<\/a> in the setLan function of the \/goform\/setLan file in the affected Linksys devices. This is triggered by the improper handling of the lan2enabled argument, which can be manipulated to overflow the buffer<\/a>. This overflow can lead to arbitrary code<\/a> execution, allowing an attacker to compromise the system or leak data.<\/p>\n

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

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

POST \/goform\/setLan HTTP\/1.1\nHost: target_linksys_device\nContent-Type: application\/x-www-form-urlencoded\nlan2enabled=1&lan2ipAddr=192.168.1.1&lan2SubnetMask=255.255.255.0&lan2DhcpStart=192.168.1.100&lan2DhcpEnd=192.168.1.150&lan2DhcpEnabled=1&lan2Dns1=192.168.1.1&lan2Lease=86400&lan2Domain=&lan2Gateway=192.168.1.1&lan2Dns2=192.168.1.1&lan2Dns3=192.168.1.1&lan2enabled=A*50000<\/code><\/pre>\n
In the above code, the lan2enabled parameter is filled with “A*50000” which is significantly larger than what the system is designed to handle, leading to a buffer overflow<\/a>.
\nIt’s important to note that the above is a simplified example and actual exploitation may require more complex manipulation.<\/p>\n
Mitigation<\/strong><\/p>\n
As a short-term mitigation, users are advised to use a Web Application Firewall (WAF) or Intrusion Detection System (IDS). However, the ultimate solution is the application of a vendor patch. Despite contacting the vendor about this critical disclosure<\/a>, they have yet to respond. Users should stay abreast of any updates from the vendor and apply patches as soon as they become available.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview The CVE-2025-8817 vulnerability, identified in a range of Linksys devices, presents a serious threat to data security and system integrity. This vulnerability affects Linksys RE6250, RE6300, RE6350, RE6500, RE7000, and RE9000 devices up to version 20250801. The vulnerability, which lies in the functionality of the setLan file, can be exploited remotely, potentially leading to […]<\/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":[86,80],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-64076","post","type-post","status-publish","format-standard","hentry","category-uncategorized","attack_vector-buffer-overflow","attack_vector-rce"],"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