{"id":59648,"date":"2025-07-26T03:18:38","date_gmt":"2025-07-26T03:18:38","guid":{"rendered":""},"modified":"2025-09-06T13:06:46","modified_gmt":"2025-09-06T19:06:46","slug":"cve-2025-7911-critical-buffer-overflow-vulnerability-in-d-link-di-8100-1-0-jhttpd","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-7911-critical-buffer-overflow-vulnerability-in-d-link-di-8100-1-0-jhttpd\/","title":{"rendered":"CVE-2025-7911: Critical Buffer Overflow Vulnerability in D-Link DI-8100 1.0 jhttpd<\/strong>"},"content":{"rendered":"

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

A severe vulnerability has been discovered in D-Link DI-8100 version 1.0, a popular networking hardware device. This vulnerability has been classified as critical, posing a significant risk to all systems running this version of the device. It pertains to the function ‘sprintf’ in the file ‘\/upnp_ctrl.asp’ of the component ‘jhttpd’. This vulnerability could allow a remote<\/a> attacker to manipulate ‘remove_ext_proto\/remove_ext_port’ arguments, leading to a stack-based buffer overflow. Given its potential to compromise systems<\/a> and lead to data leakage, it is imperative that organizations take immediate steps to patch their systems or implement appropriate mitigations.<\/p>\n

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

CVE ID: CVE-2025-7911
\nSeverity: Critical, CVSS Score 8.8
\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

D-Link DI-8100<\/a> | 1.0<\/p>\n

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

The vulnerability lies in the sprintf function of the file<\/a> \/upnp_ctrl.asp of the jhttpd component. An attacker can remotely manipulate the arguments remove_ext_proto\/remove_ext_port to induce a stack-based buffer overflow<\/a>. This overflow can allow the attacker to execute arbitrary<\/a> code on the system, potentially compromising the system or leading to data leakage.<\/p>\n

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

The following is a conceptual example of how the vulnerability might be exploited using a HTTP request<\/a>.<\/p>\n

POST \/upnp_ctrl.asp HTTP\/1.1\nHost: vulnerable_device_IP\nContent-Type: application\/json\n{\n\"remove_ext_proto\": \"OVERFLOWING STRING HERE\",\n\"remove_ext_port\": \"OVERFLOWING STRING HERE\"\n}<\/code><\/pre>\n
In the above example, the attacker sends a POST request with overly-long strings as values for remove_ext_proto and remove_ext_port, causing a buffer overflow<\/a> in the host device’s memory.<\/p>\n
Mitigation Guidance<\/strong><\/p>\n
The best course of action to mitigate this vulnerability<\/a> is to apply the vendor-provided patch. If the patch cannot be applied immediately, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as temporary mitigation. These systems can be configured to detect and block attempts to exploit this vulnerability<\/a>. However, these are only temporary solutions and should be replaced with the vendor patch as soon as feasible.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview A severe vulnerability has been discovered in D-Link DI-8100 version 1.0, a popular networking hardware device. This vulnerability has been classified as critical, posing a significant risk to all systems running this version of the device. It pertains to the function ‘sprintf’ in the file ‘\/upnp_ctrl.asp’ of the component ‘jhttpd’. This vulnerability could allow […]<\/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-59648","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