{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata — refreshed continuously.","feed_url":"https://feed.craftedsignal.io/tags/cgi-handler/","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cves":[{"cvss":7.2,"id":"CVE-2026-7857"}],"_cs_exploited":false,"_cs_products":["DI-8100 16.07.26A1"],"_cs_severities":["high"],"_cs_tags":["buffer-overflow","cgi-handler","remote-code-execution","router"],"_cs_type":"advisory","_cs_vendors":["D-Link"],"content_html":"\u003cp\u003eA buffer overflow vulnerability has been identified in D-Link DI-8100 router, specifically version 16.07.26A1. The flaw resides within the CGI Handler component, affecting the \u003ccode\u003esprintf\u003c/code\u003e function in the \u003ccode\u003e/user_group.asp\u003c/code\u003e file. This vulnerability allows a remote attacker to potentially execute arbitrary code by exploiting a buffer overflow when handling user input to the affected \u003ccode\u003esprintf\u003c/code\u003e function. The vulnerability has been publicly disclosed, increasing the risk of exploitation. This issue is particularly concerning as it affects a widely used router model, making numerous home and small office networks vulnerable to compromise.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eThe attacker sends a specially crafted HTTP request to the \u003ccode\u003e/user_group.asp\u003c/code\u003e endpoint on the D-Link DI-8100 router.\u003c/li\u003e\n\u003cli\u003eThe CGI Handler processes the request and passes user-supplied data to the \u003ccode\u003esprintf\u003c/code\u003e function.\u003c/li\u003e\n\u003cli\u003eThe \u003ccode\u003esprintf\u003c/code\u003e function, without proper bounds checking, copies the user-supplied data into a fixed-size buffer.\u003c/li\u003e\n\u003cli\u003eThe attacker provides input exceeding the buffer\u0026rsquo;s capacity, triggering a buffer overflow.\u003c/li\u003e\n\u003cli\u003eThe overflow overwrites adjacent memory regions, potentially including critical program data or function pointers.\u003c/li\u003e\n\u003cli\u003eBy carefully crafting the overflow data, the attacker can inject malicious code into memory.\u003c/li\u003e\n\u003cli\u003eThe attacker manipulates the execution flow to redirect control to the injected code.\u003c/li\u003e\n\u003cli\u003eThe injected code executes with the privileges of the CGI Handler process, allowing the attacker to potentially gain control of the device.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of this buffer overflow vulnerability could allow a remote attacker to execute arbitrary code on the D-Link DI-8100 router. This can lead to a complete compromise of the device, allowing the attacker to intercept network traffic, modify router settings, or use the compromised device as a foothold for further attacks on the local network. Given the widespread use of D-Link routers, a large number of devices are potentially vulnerable.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eApply available firmware updates from D-Link to patch CVE-2026-7857.\u003c/li\u003e\n\u003cli\u003eMonitor web server logs for suspicious requests targeting the \u003ccode\u003e/user_group.asp\u003c/code\u003e endpoint, as this could indicate exploitation attempts.\u003c/li\u003e\n\u003cli\u003eDeploy the Sigma rule detecting suspicious requests to \u003ccode\u003e/user_group.asp\u003c/code\u003e to your SIEM and tune for your environment.\u003c/li\u003e\n\u003cli\u003eImplement strong password policies and regularly update router credentials to mitigate the risk of unauthorized access.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-05-05T20:16:41Z","date_published":"2026-05-05T20:16:41Z","id":"/briefs/2026-05-dlink-di-8100-overflow/","summary":"A remote buffer overflow vulnerability exists in the sprintf function of the /user_group.asp file within the CGI Handler component of D-Link DI-8100 version 16.07.26A1, potentially leading to arbitrary code execution.","title":"D-Link DI-8100 Buffer Overflow Vulnerability","url":"https://feed.craftedsignal.io/briefs/2026-05-dlink-di-8100-overflow/"}],"language":"en","title":"CraftedSignal Threat Feed — Cgi-Handler","version":"https://jsonfeed.org/version/1.1"}