{"id":55694,"date":"2025-06-28T06:20:29","date_gmt":"2025-06-28T06:20:29","guid":{"rendered":""},"modified":"2025-08-30T04:20:27","modified_gmt":"2025-08-30T10:20:27","slug":"cve-2025-6393-critical-buffer-overflow-vulnerability-in-totolink-products","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-6393-critical-buffer-overflow-vulnerability-in-totolink-products\/","title":{"rendered":"CVE-2025-6393: Critical Buffer Overflow Vulnerability in TOTOLINK Products<\/strong>"},"content":{"rendered":"

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

A critical vulnerability, CVE-2025-6393, has been discovered in several TOTOLINK networking products. These devices are commonly used in both home and professional settings to provide network connectivity. This makes the potential impact of this vulnerability severe<\/a>, as successful exploitation could result in system compromise or data leakage. Cybersecurity professionals, network administrators, and individual users of these devices need to be aware of this threat and take appropriate measures to mitigate its risks.<\/p>\n

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

CVE ID: CVE-2025-6393
\nSeverity: Critical (CVSS 8.8)
\nAttack Vector: Remote
\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

TOTOLINK A702R<\/a> | 3.0.0-B20230809.1615
\nTOTOLINK A3002R | 4.0.0-B20230531.1404
\nTOTOLINK A3002RU | 4.0.0-B20230721.1521
\nTOTOLINK EX1200T<\/a> | 4.1.2cu.5232_B20210713<\/p>\n

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

The vulnerability lies in an unknown function of the file<\/a> \/boafrm\/formIPv6Addr of the component HTTP POST Request Handler. By manipulating the “submit-url” argument, an attacker can cause a buffer overflow<\/a>. This type of vulnerability occurs when more data<\/a> is written into a block of memory, or buffer, than it can hold. In this case, the excess data overflows into adjacent memory, potentially overwriting other data or causing the system<\/a> to crash. Remote attackers can exploit this vulnerability<\/a> without requiring any user interaction or privileges.<\/p>\n

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

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

POST \/boafrm\/formIPv6Addr HTTP\/1.1\nHost: target.example.com\nContent-Type: application\/x-www-form-urlencoded\nsubmit-url=AAAAAAAAAAAA... \/\/ Long string of \"A\"s that causes buffer overflow<\/code><\/pre>\n
In the above example, the “submit-url” argument is filled with a long string of “A”s. This string is longer than what the buffer in the vulnerable function can handle, leading to a buffer overflow<\/a>.
\nThis example is purely conceptual and is provided to illustrate the nature of the exploit. It may not work in a real-world scenario, as actual exploitation would likely require a more complex payload and understanding of the system’s memory<\/a> layout.<\/p>\n
Mitigation<\/strong><\/p>\n
It is recommended that users of the affected products apply the vendor patch as soon as it becomes available. In the meantime, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can provide temporary mitigation. These systems can be configured to detect and block attempts to exploit this vulnerability<\/a>, reducing the risk of successful attacks.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview A critical vulnerability, CVE-2025-6393, has been discovered in several TOTOLINK networking products. These devices are commonly used in both home and professional settings to provide network connectivity. This makes the potential impact of this vulnerability severe, as successful exploitation could result in system compromise or data leakage. Cybersecurity professionals, network administrators, and individual users […]<\/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-55694","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