{"id":59781,"date":"2025-07-31T17:19:07","date_gmt":"2025-07-31T17:19:07","guid":{"rendered":""},"modified":"2025-09-27T02:05:14","modified_gmt":"2025-09-27T08:05:14","slug":"cve-2025-8138-critical-buffer-overflow-vulnerability-in-totolink-a702r","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-8138-critical-buffer-overflow-vulnerability-in-totolink-a702r\/","title":{"rendered":"CVE-2025-8138: Critical Buffer Overflow Vulnerability in TOTOLINK A702R<\/strong>"},"content":{"rendered":"

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

The Common Vulnerabilities and Exposures (CVE) system has recently detailed a critical vulnerability with the identifier CVE-2025-8138, found in TOTOLINK A702R version 4.0.0-B20230721.1521. This vulnerability, if exploited, can lead to serious security breaches, system compromise, and potential data leakage. It is of critical importance to any individual or organization using the affected TOTOLINK<\/a> product to understand and mitigate this vulnerability as soon as possible.<\/p>\n

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

CVE ID: CVE-2025-8138
\nSeverity: Critical (CVSS: 8.8)
\nAttack Vector: Network
\nPrivileges Required: None
\nUser Interaction: None
\nImpact: Potential system<\/a> compromise or data leakage<\/p>\n

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

Product | Affected Versions<\/p>\n

TOTOLINK A702R<\/a> | 4.0.0-B20230721.1521<\/p>\n

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

The vulnerability resides in an unknown functionality of the file<\/a> \/boafrm\/formOneKeyAccessButton in the HTTP POST Request Handler component of the TOTOLINK A702R firmware. The exploitation of this vulnerability involves the manipulation of the ‘submit-url’ argument, which can cause a buffer overflow<\/a>. This buffer overflow<\/a> may then result in undefined behavior, potentially leading to system compromise and data leakage.<\/p>\n

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

An attacker might exploit this vulnerability by sending a maliciously crafted HTTP POST request<\/a> similar to the following:<\/p>\n

POST \/boafrm\/formOneKeyAccessButton HTTP\/1.1\nHost: target.example.com\nContent-Type: application\/x-www-form-urlencoded\nsubmit-url=www.example.com%00[insert malicious payload here]<\/code><\/pre>\n
In this example, the ‘submit-url’ argument is appended with a null byte (%00) followed by a malicious payload. This causes an overflow in the buffer<\/a> that stores the ‘submit-url’ data, which can lead to unintended consequences, potentially compromising the system and leaking data.<\/p>\n
Mitigation Guidance<\/strong><\/p>\n
It is highly recommended to apply a vendor-supplied patch as soon as possible. If a patch is not immediately available or feasible, consider using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) to temporarily mitigate the vulnerability by monitoring network<\/a> traffic and blocking or alerting on suspicious activity.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview The Common Vulnerabilities and Exposures (CVE) system has recently detailed a critical vulnerability with the identifier CVE-2025-8138, found in TOTOLINK A702R version 4.0.0-B20230721.1521. This vulnerability, if exploited, can lead to serious security breaches, system compromise, and potential data leakage. It is of critical importance to any individual or organization using the affected TOTOLINK product […]<\/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-59781","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