{"id":"CVE-2021-27342","aliases":["EUVD-2021-14102","GHSA-255g-8gjp-2wq6"],"status":"published","title":"An authentication brute-force protection mechanism bypass in telnetd in D-Link Router model DIR...","description":"An authentication brute-force protection mechanism bypass in telnetd in D-Link Router model DIR-842 firmware version 3.0.2 allows a remote attacker to circumvent the anti-brute-force cool-down delay period via a timing-based side-channel attack","severity":{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.04562,"percentile":0.91666,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":false},"cwes":["CWE-203"],"published":"2021-05-17T12:20:43Z","modified":"2026-06-17T03:44:40Z","exploits":[{"source":"pocgithub","id":"mavlevin/D-Link-CVE-2021-27342-exploit","title":"mavlevin/D-Link-CVE-2021-27342-exploit","date":"2021-05-15","url":"https://github.com/mavlevin/D-Link-CVE-2021-27342-exploit"}],"products":[{"vendor":"dlink","product":"dir-842e_firmware"}],"references":[{"url":"https://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10225","tags":["x_refsource_CONFIRM","x_transferred","Vendor Advisory"]},{"url":"https://github.com/guywhataguy/D-Link-CVE-2021-27342-exploit/blob/main/dlink-telnet-exploit-CVE-2021-27342.py","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory"]},{"url":"https://blog.whtaguy.com/2021/05/d-link-router-cve-2021-27342.html","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-27342"},{"url":"https://github.com/advisories/GHSA-255g-8gjp-2wq6"}],"sources":{"cve":[{"id":"CVE-2021-27342","description":"An authentication brute-force protection mechanism bypass in telnetd in D-Link Router model DIR-842 firmware version 3.0.2 allows a remote attacker to circumvent the anti-brute-force cool-down delay period via a timing-based side-channel attack","status":"published","published":"2021-05-17T12:20:43Z","modified":"2024-08-03T20:48:16.145Z","updated_at":"2026-11-02T14:33:04.360272Z"}],"euvd":[{"id":"EUVD-2021-14102","description":"An authentication brute-force protection mechanism bypass in telnetd in D-Link Router model DIR-842 firmware version 3.0.2 allows a remote attacker to circumvent the anti-brute-force cool-down delay period via a timing-based side-channel attack","status":"published","published":"2021-05-17T12:20:43Z","modified":"2024-08-03T20:48:16Z","updated_at":"2026-11-03T03:24:49.368497Z"}],"ghsa":[{"id":"GHSA-255g-8gjp-2wq6","title":"An authentication brute-force protection mechanism bypass in telnetd in D-Link Router model DIR...","description":"An authentication brute-force protection mechanism bypass in telnetd in D-Link Router model DIR-842 firmware version 3.0.2 allows a remote attacker to circumvent the anti-brute-force cool-down delay period via a timing-based side-channel attack","status":"published","published":"2022-05-24T19:02:38Z","modified":"2023-01-29T05:06:17Z","cwes":["CWE-203"],"updated_at":"2026-11-02T14:45:59.496932Z"}],"nvd":[{"id":"CVE-2021-27342","description":"An authentication brute-force protection mechanism bypass in telnetd in D-Link Router model DIR-842 firmware version 3.0.2 allows a remote attacker to circumvent the anti-brute-force cool-down delay period via a timing-based side-channel attack","status":"published","published":"2021-05-17T13:15:07.733Z","modified":"2026-06-17T03:44:40.153Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":4.3,"vector":"AV:N/AC:M/Au:N/C:N/I:P/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-203"],"updated_at":"2026-11-02T14:06:53.343329Z"}]}}