{"id":"CVE-2026-124560","published":"2026-11-09T03:16:38.117","lastModified":"2026-11-09T03:16:38.370","description":"A vulnerability was found in D-Link DIR-878 1.20B05. This affects the function GetCAPTCHAsetting of the file bin/prog.cgi of the component HNAP Handler. Performing a manipulation of the argument uid results in heap-based buffer overflow. The attack can be initiated remotely. The exploit has been made public and could be used. This vulnerability only affects products that are no longer supported by the maintainer.","cvssScore":9.8,"cvssSeverity":"CRITICAL","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cwes":["CWE-119","CWE-122"],"vendors":[],"products":[],"references":[{"url":"https://github.com/Zimo-666/DIR-878-cves/tree/main/01-captcha-uid-heap-overflow","tags":[]},{"url":"https://vuldb.com/cve/CVE-2026-124560","tags":[]},{"url":"https://vuldb.com/submit/1035616","tags":[]},{"url":"https://vuldb.com/vuln/432892","tags":[]},{"url":"https://vuldb.com/vuln/432892/cti","tags":[]},{"url":"https://www.dlink.com/","tags":[]}],"exploitRefs":[{"url":"https://github.com/Zimo-666/DIR-878-cves/tree/main/01-captcha-uid-heap-overflow","tags":[]}],"hasPoc":true,"ai":{"summary":"A heap-based buffer overflow in D-Link DIR-878 firmware v1.20B05's HNAP handler (GetCAPTCHAsetting function) allows remote attackers to corrupt memory by supplying a malformed uid parameter, enabling full system compromise including remote code execution.","exploitability":"Exploitation is trivial as a public exploit exists and requires no authentication or user interaction due to the network-accessible HNAP endpoint.","blast_radius":"Successful exploitation grants full control of the device, potentially enabling pivot into internal networks, credential theft, or use as a persistent backdoor.","remediation":"No fixed version is published by D-Link; the device is end-of-life and unsupported, so immediate decommissioning and replacement with a supported model is the only effective remediation.","detection":"No reliable host or network indicator is derivable from the published description.","tags":["buffer-overflow","hnap","eol","remote-exploit","heap-overflow"],"model":"garnet-coder","analyzedAt":"2026-11-09T09:44:09.529Z"}}