{"id":"CVE-2026-0625","published":"2026-01-05T21:14:48Z","modified":"2026-05-25T23:41:34Z","title":"D-Link DSL/DIR/DNS Authentication Bypass via DNS Configuration Endpoint","vendor":"D-Link","product":"DSL-2640B","tier":"core","eol":null,"affectedVersions":[{"vendor":"D-Link","product":"DSL-2640B","versions":["0"]},{"vendor":"D-Link","product":"DSL-2740R","versions":["0"]},{"vendor":"D-Link","product":"DSL-2780B","versions":["0"]},{"vendor":"D-Link","product":"DSL-526B","versions":["0"]},{"vendor":"D-Link","product":"DSL-2640T","versions":["0"]},{"vendor":"D-Link","product":"DSL-500","versions":["0"]},{"vendor":"D-Link","product":"DSL-500G","versions":["0"]},{"vendor":"D-Link","product":"DSL-502G","versions":["0"]},{"vendor":"D-Link","product":"DIR-905L","versions":["0"]},{"vendor":"D-Link","product":"DIR-600","versions":["0"]}],"description":{"text":"Multiple D-Link DSL/DIR/DNS devices contain an authentication bypass and improper access control vulnerability in the dnscfg.cgi endpoint that allows an unauthenticated attacker to access DNS configuration functionality. By directly requesting this endpoint, an attacker can modify the device’s DNS settings without valid credentials, enabling DNS hijacking (“DNSChanger”) attacks that redirect user traffic to attacker-controlled infrastructure. In 2019, D-Link reported that this behavior was leveraged by the \"GhostDNS\" malware ecosystem targeting consumer and carrier routers. All impacted products were subsequently designated end-of-life/end-of-service, and no longer receive security updates. Exploitation evidence was observed by the Shadowserver Foundation on 2025-11-27 (UTC).","provenance":"source","from":"CVE.org"},"summary":null,"cvss":{"score":9.3,"severity":"CRITICAL","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","provenance":"source","from":"CVE.org CNA"},"epss":{"score":0.00972,"percentile":0.61925,"date":"2026-10-30","provenance":"source"},"kev":null,"vulncheckKev":{"dateAdded":"2026-01-05","exploitedFirstSeen":"2026-01-05","ransomware":false,"evidence":[{"url":"https://www.cve.org/cverecord?id=CVE-2026-0625","date":"2026-01-05"},{"url":"https://www.vulncheck.com/advisories/dlink-dsl-command-injection-via-dns-configuration-endpoint","date":"2026-01-05"},{"url":"https://supportannouncement.us.dlink.com/security/publication.aspx?name=SAP10488","date":"2026-01-06"},{"url":"https://ti.qianxin.com/uploads/2026/10/29/20ab59a356a884498644cff73d47a13a.pdf","date":"2026-10-29"}],"evidenceTotal":4,"provenance":"source"},"exploited":true,"otx":{"pulseCount":1,"pulses":[{"name":"ModularMayhem + Mythic RAT Campaign - Jan 27 2026","url":"https://otx.alienvault.com/pulse/6978ebb21a317dd14d01697d","created":"2026-01-27"}],"provenance":"machine"},"cwes":[{"id":"CWE-306","name":"Missing Authentication for Critical Functionality"}],"references":[{"url":"https://supportannouncement.us.dlink.com/security/publication.aspx?name=SAP10488","tags":["vendor-advisory","mitigation"]},{"url":"https://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10068","tags":["vendor-advisory"]},{"url":"https://supportannouncement.us.dlink.com/security/publication.aspx?name=SAP10118","tags":["vendor-advisory"]},{"url":"https://www.vulncheck.com/advisories/dlink-dsl-command-injection-via-dns-configuration-endpoint","tags":["third-party-advisory"]}],"techniques":[],"reports":[],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2026-0944","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-0944","exploited":false,"exploitedSince":null,"provenance":"source"},"exploits":[],"exploitSources":null,"exploitRefs":[],"flow":[],"timeline":[{"date":"2026-01-05","kind":"published","label":"Published (CVE.org)","url":"https://www.cve.org/CVERecord?id=CVE-2026-0625","provenance":"source"},{"date":"2026-01-05","kind":"exploited-reported","label":"Exploitation first reported (VulnCheck KEV evidence)","url":"https://www.cve.org/cverecord?id=CVE-2026-0625","provenance":"source"}],"speed":{"daysToPublicExploit":null,"firstExploitFrom":null,"daysToKev":null},"priority":{"score":59.6,"factors":[{"name":"In a KEV catalog","points":35.0,"detail":"listed in VulnCheck KEV"},{"name":"Recent KEV listing","points":5.0,"detail":"added 299 days ago"},{"name":"Known ransomware use","points":0.0,"detail":"not known"},{"name":"EPSS percentile","points":12.38,"detail":"percentile 0.6192"},{"name":"Named in threat reports","points":0.0,"detail":"0 reports"},{"name":"Public exploit code","points":0.0,"detail":"none found"},{"name":"Mentioned in OTX pulses","points":0.68,"detail":"1 pulse"},{"name":"CVSS severity","points":6.51,"detail":"base score 9.3"},{"name":"End-of-life product","points":0.0,"detail":"supported or unknown"}]}}