{"id":59808,"date":"2025-08-01T20:28:57","date_gmt":"2025-08-01T20:28:57","guid":{"rendered":""},"modified":"2025-09-03T19:03:37","modified_gmt":"2025-09-04T01:03:37","slug":"cve-2025-8170-remote-buffer-overflow-vulnerability-in-totolink-t6","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-8170-remote-buffer-overflow-vulnerability-in-totolink-t6\/","title":{"rendered":"CVE-2025-8170: Remote Buffer Overflow Vulnerability in TOTOLINK T6<\/strong>"},"content":{"rendered":"

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

The cybersecurity industry has recently witnessed another critical vulnerability, CVE-2025-8170, that poses significant risk to TOTOLINK T6 routers. This vulnerability affects the ‘tcpcheck_net’ function of the file ‘\/router\/meshSlaveDlfw’ in the MQTT Packet Handler component. With the potential to compromise systems or lead to data leakage, this vulnerability has been classified as critical<\/a>. It is noteworthy that this flaw can be exploited remotely, and thus, it requires immediate attention from network administrators and security<\/a> teams managing TOTOLINK T6 routers.<\/p>\n

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

CVE ID: CVE-2025-8170
\nSeverity: Critical (8.8 CVSS Severity Score)
\nAttack Vector: Network
\nPrivileges Required: None
\nUser Interaction: None
\nImpact: System compromise<\/a> or data leakage<\/p>\n

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

Product | Affected Versions<\/p>\n

TOTOLINK T6 | 4.1.5cu.748_B20211015<\/p>\n

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

The exploit revolves around the manipulation of the ‘serverIp’ argument in the ‘tcpcheck_net’ function. The ‘serverIp’ argument is not properly validated, which allows a remote<\/a> attacker to send a specially crafted MQTT packet causing a buffer overflow condition. This can lead to arbitrary code execution<\/a>, potentially allowing the attacker to take control of the system or cause data leakage.<\/p>\n

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

The vulnerability might be exploited with a malicious MQTT packet<\/a>. Here is a conceptual representation of such an exploit:<\/p>\n

POST \/router\/meshSlaveDlfw HTTP\/1.1\nHost: target.example.com\nContent-Type: application\/json\n{ \"serverIp\": \"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA...\" }<\/code><\/pre>\n
In this conceptual example, “AAAAAAAA…” represents an overly long string that causes a buffer overflow<\/a>. This is a simplified representation for illustrative purposes, and a real exploit would likely use more complex data to achieve code execution<\/a>.<\/p>\n
Mitigation Guidance<\/strong><\/p>\n
Users of TOTOLINK T6 routers are advised to apply the vendor patch as soon as it is available. Until then, the use of a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as temporary mitigation. Regularly monitoring network traffic for any signs of abnormal activity can also help in early detection and prevention of an exploit.
\nPlease note that this is a high-severity vulnerability. Prompt action is required to protect your systems and data from potential<\/a> breaches.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview The cybersecurity industry has recently witnessed another critical vulnerability, CVE-2025-8170, that poses significant risk to TOTOLINK T6 routers. This vulnerability affects the ‘tcpcheck_net’ function of the file ‘\/router\/meshSlaveDlfw’ in the MQTT Packet Handler component. With the potential to compromise systems or lead to data leakage, this vulnerability has been classified as critical. It is […]<\/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-59808","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