{"id":51946,"date":"2025-06-14T13:56:11","date_gmt":"2025-06-14T13:56:11","guid":{"rendered":""},"modified":"2025-06-29T17:18:55","modified_gmt":"2025-06-29T23:18:55","slug":"cve-2025-5849-critical-buffer-overflow-vulnerability-in-tenda-ac15","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-5849-critical-buffer-overflow-vulnerability-in-tenda-ac15\/","title":{"rendered":"CVE-2025-5849: Critical Buffer Overflow Vulnerability in Tenda AC15<\/strong>"},"content":{"rendered":"

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

The cybersecurity landscape is constantly evolving with new threats continually emerging. One of these threats is a critical vulnerability identified as CVE-2025-5849. This vulnerability affects the popular Tenda<\/a> AC15 15.03.05.19_multi router. The flaw lies in the function formSetSafeWanWebMan of the file \/goform\/SetRemoteWebCfg of the HTTP POST Request<\/a> Handler.
\nThis vulnerability matters because it can lead<\/a> to a stack-based buffer overflow, potentially resulting in system compromise or data leakage. Since it’s possible to initiate the attack remotely<\/a> and the exploit is already public, the risk for users is significant.<\/p>\n

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

CVE ID: CVE-2025-5849
\nSeverity: Critical (8.8 CVSS)
\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

Tenda AC15<\/a> | 15.03.05.19_multi<\/p>\n

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

This vulnerability stems from improper validation of user-supplied data<\/a>, which can lead to a stack-based buffer overflow. The problem occurs when the remoteIp argument is manipulated in the HTTP POST Request<\/a> Handler. This could allow an attacker to overwrite the allocated buffer, leading to the execution of arbitrary code<\/a>, or even cause the system to crash, resulting in a denial of service.<\/p>\n

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

Here’s a conceptual example of how this vulnerability might be exploited. This is a simple HTTP POST request<\/a> with manipulated remoteIp argument:<\/p>\n

POST \/goform\/SetRemoteWebCfg HTTP\/1.1\nHost: target.example.com\nContent-Type: application\/x-www-form-urlencoded\nremoteIp=192.168.1.1%00[insert malicious code here]<\/code><\/pre>\n
In this example, the IP address has been followed by a null byte (%00), effectively terminating the string. The malicious code following the null byte could then overflow the buffer<\/a>.<\/p>\n
Mitigation<\/strong><\/p>\n
The best way to mitigate this vulnerability is by applying the patch provided<\/a> by the vendor. If the patch can’t be applied immediately, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can provide temporary mitigation. It is also advisable to limit access to the vulnerable system<\/a> to trusted networks and hosts.
\nUltimately, staying updated with the latest security patches and maintaining a robust security infrastructure are key to minimizing the risk of such vulnerabilities<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview The cybersecurity landscape is constantly evolving with new threats continually emerging. One of these threats is a critical vulnerability identified as CVE-2025-5849. This vulnerability affects the popular Tenda AC15 15.03.05.19_multi router. The flaw lies in the function formSetSafeWanWebMan of the file \/goform\/SetRemoteWebCfg of the HTTP POST Request Handler. This vulnerability matters because it can […]<\/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-51946","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