{"id":"CVE-2021-40655","published":"2021-09-24T21:15:07Z","modified":"2026-06-17T04:07:13Z","title":"D-Link DIR-605 Router Information Disclosure Vulnerability","vendor":"D-Link","product":"DIR-605 Router","tier":"core","eol":null,"description":{"text":"An informtion disclosure issue exists in D-LINK-DIR-605 B2 Firmware Version : 2.01MT. An attacker can obtain a user name and password by forging a post request to the / getcfg.php page","provenance":"source","from":"NVD"},"summary":{"text":"The D-Link DIR-605 Router, running firmware version 2.01MT, contains an information disclosure flaw in its /getcfg.php page. An unauthenticated remote attacker over the network can forge a POST request to that page to obtain the device's user name and password, with no user interaction required.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-23T07:11:00Z"},"cvss":{"score":7.5,"severity":"HIGH","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","provenance":"source","from":"NVD"},"epss":{"score":0.87039,"percentile":0.99747,"date":"2026-10-29","provenance":"source"},"kev":{"dateAdded":"2024-05-16","dueDate":"2024-06-06","ransomware":false,"requiredAction":"This vulnerability affects legacy D-Link products. All associated hardware revisions have reached their end-of-life (EOL) or end-of-service (EOS) life cycle and should be retired and replaced per vendor instructions.","notes":"https://legacy.us.dlink.com/pages/product.aspx?id=2b09e95d90ff4cb38830ecc04c89cee5; https://nvd.nist.gov/vuln/detail/CVE-2021-40655","provenance":"source"},"vulncheckKev":{"dateAdded":"2024-05-16","exploitedFirstSeen":"2024-05-16","ransomware":false,"evidence":[{"url":"https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json","date":"2024-05-16"},{"url":"https://www.fortiguard.com/outbreak-alert/d-link-multiple-devices-attack","date":"2024-05-24"},{"url":"https://www.forescout.com/resources/2024h1-threat-review/","date":"2024-08-29"},{"url":"https://info.greynoise.io/hubfs/resources/GreyNoise-2025-Mass-Internet-Exploitation-Report.pdf","date":"2025-02-27"},{"url":"https://app.crowdsec.net/cti/cve-explorer/CVE-2021-40655","date":"2025-06-07"}],"evidenceTotal":5,"provenance":"source"},"exploited":true,"otx":{"pulseCount":50,"pulses":[{"name":"Actively_Exploited_Kev | Oct 29, 2026","url":"https://otx.alienvault.com/pulse/6ae20c1db17e7057ae7d9ad1","created":"2026-10-28"},{"name":"Actively_Exploited_Kev | Oct 28, 2026","url":"https://otx.alienvault.com/pulse/6ae0ba7e0e2a97ff7b218819","created":"2026-10-27"},{"name":"Actively_Exploited_Kev | Oct 27, 2026","url":"https://otx.alienvault.com/pulse/6adf68b85c3e852f3c111d18","created":"2026-10-26"},{"name":"Actively_Exploited_Kev | Oct 24, 2026","url":"https://otx.alienvault.com/pulse/6adb740e397c3ad4799aa4cd","created":"2026-10-23"},{"name":"Actively_Exploited_Kev | Oct 23, 2026","url":"https://otx.alienvault.com/pulse/6ada236fcfba2dfa730ea482","created":"2026-10-22"},{"name":"Actively_Exploited_Kev | Oct 22, 2026","url":"https://otx.alienvault.com/pulse/6ad8d33a077cbb5cab524d80","created":"2026-10-21"},{"name":"Actively_Exploited_Kev | Oct 21, 2026","url":"https://otx.alienvault.com/pulse/6ad78130c4d1ac2be83a8b6d","created":"2026-10-20"},{"name":"Actively_Exploited_Kev | Oct 20, 2026","url":"https://otx.alienvault.com/pulse/6ad62f63c24a405a3423cc13","created":"2026-10-19"},{"name":"Actively_Exploited_Kev | Oct 19, 2026","url":"https://otx.alienvault.com/pulse/6ad4dda174e5797d0bd238b7","created":"2026-10-18"},{"name":"Actively_Exploited_Kev | Oct 18, 2026","url":"https://otx.alienvault.com/pulse/6ad38c22e1848f8189d1c121","created":"2026-10-17"}],"provenance":"machine"},"cwes":[{"id":"CWE-863","name":"Incorrect Authorization"}],"references":[{"url":"https://github.com/Ilovewomen/D-LINK-DIR-605/","tags":["Exploit","Third Party Advisory"]},{"url":"https://www.dlink.com/en/security-bulletin/","tags":["Vendor Advisory"]},{"url":"https://github.com/Ilovewomen/D-LINK-DIR-605/","tags":["Exploit","Third Party Advisory"]},{"url":"https://www.dlink.com/en/security-bulletin/","tags":["Vendor Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-40655","tags":["US Government Resource"]}],"techniques":[{"id":"T1190","name":"Exploit Public-Facing Application","tactics":["initial-access"],"provenance":"source","basis":"ctid-kev","bases":["ctid-kev"],"basisDetail":"CTID Mappings Explorer KEV 07/28/2025 (ATT&CK 16.1); capability: Improper Access Control","mappingType":"exploitation_technique","evidence":[],"comment":"This vulnerability is exploited when an adversary forges a post request to the / get cfg.php page. The POST request could enable the adversary to obtain username and password information on the router. ","confidence":"high"}],"reports":[],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2021-27829","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2021-27829","exploited":true,"exploitedSince":"2024-05-16","provenance":"source"},"exploits":[],"exploitSources":{"nuclei":[{"id":"CVE-2021-40655","name":"D-Link DIR-605 - Information Disclosure","severity":"high","path":"http/cves/2021/CVE-2021-40655.yaml","url":"https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-40655.yaml"}],"provenance":"source"},"exploitRefs":["https://github.com/Ilovewomen/D-LINK-DIR-605/"],"flow":[{"stage":"exploitation","techniques":["T1190"],"provenance":"source"}],"timeline":[{"date":"2021-09-24","kind":"published","label":"Published (NVD)","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-40655","provenance":"source"},{"date":"2024-05-16","kind":"exploited-reported","label":"Exploitation first reported (VulnCheck KEV evidence)","url":"https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json","provenance":"source"},{"date":"2024-05-16","kind":"kev","label":"Added to CISA KEV","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","provenance":"source"},{"date":"2024-05-16","kind":"euvd-exploited","label":"ENISA EUVD: exploited","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2021-27829","provenance":"source"}],"speed":{"daysToPublicExploit":null,"firstExploitFrom":null,"daysToKev":965},"priority":{"score":68.2,"factors":[{"name":"In a KEV catalog","points":35.0,"detail":"listed in CISA KEV and VulnCheck KEV"},{"name":"Recent KEV listing","points":0.0,"detail":"added 896 days ago"},{"name":"Known ransomware use","points":0.0,"detail":"not known"},{"name":"EPSS percentile","points":19.95,"detail":"percentile 0.9975"},{"name":"Named in threat reports","points":0.0,"detail":"0 reports"},{"name":"Public exploit code","points":5.0,"detail":"1 NVD reference tagged Exploit; 1 nuclei template"},{"name":"Mentioned in OTX pulses","points":3.0,"detail":"50 pulses"},{"name":"CVSS severity","points":5.25,"detail":"base score 7.5"},{"name":"End-of-life product","points":0.0,"detail":"supported or unknown"}]}}