{"id":53726,"date":"2025-06-20T17:55:54","date_gmt":"2025-06-20T17:55:54","guid":{"rendered":""},"modified":"2025-09-12T05:18:22","modified_gmt":"2025-09-12T11:18:22","slug":"cve-2025-6113-critical-buffer-overflow-vulnerability-in-tenda-fh1203-2-0-1-6","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-6113-critical-buffer-overflow-vulnerability-in-tenda-fh1203-2-0-1-6\/","title":{"rendered":"CVE-2025-6113: Critical Buffer Overflow Vulnerability in Tenda FH1203 2.0.1.6<\/strong>"},"content":{"rendered":"

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

CVE-2025-6113 is a critical vulnerability found in the Tenda FH1203 2.0.1.6 network router. This vulnerability, found in the function fromadvsetlanip of the file \/goform\/AdvSetLanip, allows for buffer overflow attacks. These types of attacks have the potential to compromise system<\/a> integrity and expose sensitive data, making this vulnerability a serious security concern. Given the ubiquity of Tenda routers<\/a>, this vulnerability could potentially impact a significant number of systems worldwide, necessitating immediate attention and remediation.<\/p>\n

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

CVE ID: CVE-2025-6113
\nSeverity: Critical (CVSS: 8.8)
\nAttack Vector: Network
\nPrivileges Required: None
\nUser Interaction: None
\nImpact: Potential system<\/a> compromise and data leakage<\/p>\n

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

Product | Affected Versions<\/p>\n

Tenda FH1203 | 2.0.1.6<\/p>\n

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

The exploit targets the fromadvsetlanip function within the \/goform\/AdvSetLanip file<\/a> of the Tenda FH1203 router. Specifically, the vulnerability arises from the manipulation of the lanMask argument, leading to a buffer overflow<\/a>. By sending an overly large packet of data to the lanMask argument, an attacker can cause the system to overflow the buffer<\/a>, corrupting adjacent memory space. This could potentially allow the attacker to execute arbitrary code<\/a> or cause a denial of service.<\/p>\n

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

Here’s a conceptual example of how this vulnerability might be exploited. Note that this is a simplified conceptual example and not actual exploit code.<\/p>\n

POST \/goform\/AdvSetLanip HTTP\/1.1\nHost: target.router.ip\nContent-Type: application\/x-www-form-urlencoded\nlanMask=255.255.255.255&oversizedData=[...]<\/code><\/pre>\n
In this example, the “oversizedData” stands for the excessive amount of data that causes the buffer overflow<\/a>.<\/p>\n
Mitigation and Recommendations<\/strong><\/p>\n
Users of affected Tenda FH1203 routers are strongly advised to apply the vendor patch as soon as possible. In the absence of a patch, or as a temporary mitigation, firewalls or intrusion detection systems (IDS) can be configured to detect and block attempts to exploit this vulnerability<\/a>. Users should also consider enabling<\/a> automatic updates to ensure that future patches are applied promptly. Regular monitoring and logging of network traffic can also aid in identifying any potential exploitation<\/a> attempts.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview CVE-2025-6113 is a critical vulnerability found in the Tenda FH1203 2.0.1.6 network router. This vulnerability, found in the function fromadvsetlanip of the file \/goform\/AdvSetLanip, allows for buffer overflow attacks. These types of attacks have the potential to compromise system integrity and expose sensitive data, making this vulnerability a serious security concern. Given the ubiquity […]<\/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":[86,87],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-53726","post","type-post","status-publish","format-standard","hentry","category-uncategorized","attack_vector-buffer-overflow","attack_vector-dos"],"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