{"id":53723,"date":"2025-06-20T14:54:45","date_gmt":"2025-06-20T14:54:45","guid":{"rendered":""},"modified":"2025-06-29T17:18:54","modified_gmt":"2025-06-29T23:18:54","slug":"cve-2025-6121-critical-buffer-overflow-vulnerability-in-d-link-dir-632-fw103b08","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-6121-critical-buffer-overflow-vulnerability-in-d-link-dir-632-fw103b08\/","title":{"rendered":"CVE-2025-6121: Critical Buffer Overflow Vulnerability in D-Link DIR-632 FW103B08<\/strong>"},"content":{"rendered":"

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

An alarming cybersecurity vulnerability, classified as critical, has been identified in D-Link DIR-632 FW103B08. This flaw is coded as CVE-2025-6121 and affects the function get_pure_content of the HTTP POST request handler. This vulnerability is severe as it can potentially lead<\/a> to a system compromise or data leakage, jeopardizing the privacy and security of users and businesses alike. Given the fact that the vulnerability affects products<\/a> no longer supported by the maintainer, this matter is further complicated, necessitating immediate and careful attention.<\/p>\n

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

CVE ID: CVE-2025-6121
\nSeverity: Critical, with a CVSS score of 9.8
\nAttack Vector: Network
\nPrivileges Required: None
\nUser Interaction: None
\nImpact: A successful exploitation of this vulnerability could lead to a complete system<\/a> compromise or potential data leakage.<\/p>\n

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

Product | Affected Versions<\/p>\n

D-Link DIR-632<\/a> | FW103B08<\/p>\n

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

The vulnerability resides in the HTTP POST request handler of D-Link DIR-632<\/a> FW103B08. More specifically, the function get_pure_content is susceptible to manipulation via the Content-Length argument, resulting in a stack-based buffer overflow<\/a>. This condition is often exploited to execute arbitrary code<\/a> or cause a denial of service. The attack can be performed remotely, making it a crucial threat to any systems running the vulnerable<\/a> software version.<\/p>\n

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

Here is a conceptual example of how the vulnerability might be exploited. This example uses an HTTP POST request<\/a> with manipulated Content-Length:<\/p>\n

POST \/get_pure_content HTTP\/1.1\nHost: vulnerable-device.example.com\nContent-Type: application\/x-www-form-urlencoded\nContent-Length: [manipulated value]\ndata=[malicious payload]<\/code><\/pre>\n
In the above example, the Content-Length value is manipulated to overflow the buffer<\/a> in the get_pure_content function, potentially allowing for arbitrary code execution.<\/p>\n
Mitigation Guidance<\/strong><\/p>\n
As the products affected by this vulnerability<\/a> are no longer supported by the maintainer, the primary recommendation is to replace these devices with a newer, supported model where possible. If this is not immediately achievable, a temporary mitigation strategy would be to apply a vendor patch or employ a Web Application Firewall (WAF) or Intrusion Detection System (IDS). These protective measures can help detect and prevent attacks leveraging this vulnerability<\/a> until a more permanent solution can be implemented.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview An alarming cybersecurity vulnerability, classified as critical, has been identified in D-Link DIR-632 FW103B08. This flaw is coded as CVE-2025-6121 and affects the function get_pure_content of the HTTP POST request handler. This vulnerability is severe as it can potentially lead to a system compromise or data leakage, jeopardizing the privacy and security of 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":[86,87,80],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-53723","post","type-post","status-publish","format-standard","hentry","category-uncategorized","attack_vector-buffer-overflow","attack_vector-dos","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