{"id":53909,"date":"2025-06-21T07:06:09","date_gmt":"2025-06-21T07:06:09","guid":{"rendered":""},"modified":"2025-09-07T11:38:32","modified_gmt":"2025-09-07T17:38:32","slug":"cve-2025-6138-critical-buffer-overflow-vulnerability-in-totolink-t10-4-1-8cu-5207","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-6138-critical-buffer-overflow-vulnerability-in-totolink-t10-4-1-8cu-5207\/","title":{"rendered":"CVE-2025-6138: Critical Buffer Overflow Vulnerability in TOTOLINK T10 4.1.8cu.5207<\/strong>"},"content":{"rendered":"

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

In today’s blog post, we will be discussing the critical vulnerability, CVE-2025-6138, found in TOTOLINK T10 4.1.8cu.5207. This vulnerability affects the HTTP POST Request Handler component and could potentially lead to system compromise or data leakage. It is deemed critical due<\/a> to its severity and the fact that the exploit has been disclosed to the public, making it a potential target for malicious actors. Furthermore, as this vulnerability can be exploited remotely<\/a>, it poses a significant threat to any system running on the affected versions of the TOTOLINK T10 4.1.8cu.5207.<\/p>\n

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

CVE ID: CVE-2025-6138
\nSeverity: Critical, CVSS Severity Score 8.8
\nAttack Vector: Remote
\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 T10<\/a> | 4.1.8cu.5207<\/p>\n

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

The exploit works by manipulating the argument ‘ssid5g’ in the function setWizardCfg of the file \/cgi-bin\/cstecgi.cgi, which is part of the HTTP POST Request<\/a> Handler component. This manipulation leads to buffer overflow<\/a>, which could potentially allow an attacker to execute arbitrary code or disrupt the normal functioning of the system. The attack can be launched remotely, meaning that an attacker does not need physical access to the system to exploit this vulnerability<\/a>.<\/p>\n

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

Below is a conceptual example of how the vulnerability might be exploited. This is a sample HTTP POST request, which sends a malicious payload that triggers the buffer overflow<\/a>:<\/p>\n

POST \/cgi-bin\/cstecgi.cgi?action=setWizardCfg HTTP\/1.1\nHost: target.example.com\nContent-Type: application\/x-www-form-urlencoded\nssid5g=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA...<\/code><\/pre>\n
This payload would replace the ‘ssid5g’ argument with an excessively long string of ‘A’ characters, causing a buffer overflow<\/a> in the system.<\/p>\n
Mitigation<\/strong><\/p>\n
To mitigate this vulnerability<\/a>, users are advised to apply the vendor patch as soon as it becomes available. Until then, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) could serve as a temporary mitigation. Regularly monitoring system logs for any suspicious activity could also help in early detection of any potential exploit<\/a> attempts.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview In today’s blog post, we will be discussing the critical vulnerability, CVE-2025-6138, found in TOTOLINK T10 4.1.8cu.5207. This vulnerability affects the HTTP POST Request Handler component and could potentially lead to system compromise or data leakage. It is deemed critical due to its severity and the fact that the exploit has been disclosed 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],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-53909","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