{"id":64075,"date":"2025-08-15T15:25:24","date_gmt":"2025-08-15T15:25:24","guid":{"rendered":""},"modified":"2025-10-02T00:14:31","modified_gmt":"2025-10-02T06:14:31","slug":"cve-2025-8816-critical-buffer-overflow-vulnerability-in-linksys-range-extenders","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-8816-critical-buffer-overflow-vulnerability-in-linksys-range-extenders\/","title":{"rendered":"CVE-2025-8816: Critical Buffer Overflow Vulnerability in Linksys Range Extenders<\/strong>"},"content":{"rendered":"

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

A critical vulnerability, identified as CVE-2025-8816, has been identified in several models of Linksys range extenders. This vulnerability is present in the setOpMode function of the \/goform\/setOpMode file, which can lead to a stack-based buffer overflow when manipulated via the argument ‘ethConv’. This vulnerability poses a significant threat due to its potential<\/a> to compromise systems or leak data. The issue affects<\/a> a wide array of Linksys devices, thereby posing a risk to a large number of users worldwide.
\nThe vulnerability is particularly concerning as it can be exploited remotely<\/a>, and the details of the exploit have been publicly disclosed. Despite being notified, the vendor has not responded to this disclosure, increasing the urgency of addressing this vulnerability<\/a>.<\/p>\n

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

CVE ID: CVE-2025-8816
\nSeverity: Critical (8.8 CVSS 3.x Severity Score)
\nAttack Vector: Network
\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 lies in the setOpMode function of the \/goform\/setOpMode file<\/a>. An attacker can manipulate the ‘ethConv’ argument to trigger a buffer overflow<\/a>. Buffer overflow<\/a> occurs when more data is put into a buffer than it can handle, causing it to overwrite adjacent memory areas, leading to erratic program behavior, including memory access errors, incorrect results, program termination, or a breach of system security.<\/p>\n

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

The following is a conceptual example of how the vulnerability might be exploited using an HTTP POST<\/a> request to the vulnerable endpoint:<\/p>\n

POST \/goform\/setOpMode HTTP\/1.1\nHost: target.example.com\nContent-Type: application\/x-www-form-urlencoded\nethConv=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA...<\/code><\/pre>\n
In this example, the ‘ethConv’ argument is filled with an excessively long string of ‘A’ characters, causing a buffer overflow and potentially<\/a> allowing for the execution of malicious code.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview A critical vulnerability, identified as CVE-2025-8816, has been identified in several models of Linksys range extenders. This vulnerability is present in the setOpMode function of the \/goform\/setOpMode file, which can lead to a stack-based buffer overflow when manipulated via the argument ‘ethConv’. This vulnerability poses a significant threat due to its potential to compromise […]<\/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-64075","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