{"id":"CVE-2021-25309","aliases":["EUVD-2021-12209","GHSA-9445-66j5-fhvj"],"status":"published","title":"The telnet administrator service running on port 650 on Gigaset DX600A v41.00-175 devices does...","description":"The telnet administrator service running on port 650 on Gigaset DX600A v41.00-175 devices does not implement any lockout or throttling functionality. This situation (together with the weak password policy that forces a 4-digit password) allows remote attackers to easily obtain administrative access via brute-force attacks.","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-11","score":0.01397,"percentile":0.72788,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-269","CWE-307","CWE-521"],"published":"2021-03-02T00:41:00Z","modified":"2026-06-17T03:41:48Z","products":[{"vendor":"gigaset","product":"dx600a_firmware"}],"references":[{"url":"https://research.nccgroup.com/2021/02/28/technical-advisory-administrative-passcode-recovery-and-authenticated-remote-buffer-overflow-vulnerabilities-in-gigaset-dx600a-handset-cve-2021-25309-cve-2021-25306/","tags":["x_refsource_MISC","x_transferred","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-25309"},{"url":"https://github.com/advisories/GHSA-9445-66j5-fhvj"}],"sources":{"cve":[{"id":"CVE-2021-25309","description":"The telnet administrator service running on port 650 on Gigaset DX600A v41.00-175 devices does not implement any lockout or throttling functionality. This situation (together with the weak password policy that forces a 4-digit password) allows remote attackers to easily obtain administrative access via brute-force attacks.","status":"published","published":"2021-03-02T00:41:00Z","modified":"2024-08-03T20:03:05.068Z","updated_at":"2026-11-02T14:32:59.802172Z"}],"euvd":[{"id":"EUVD-2021-12209","description":"The telnet administrator service running on port 650 on Gigaset DX600A v41.00-175 devices does not implement any lockout or throttling functionality. This situation (together with the weak password policy that forces a 4-digit password) allows remote attackers to easily obtain administrative access via brute-force attacks.","status":"published","published":"2021-03-02T00:41:00Z","modified":"2024-08-03T20:03:05Z","updated_at":"2026-11-03T03:24:53.85348Z"}],"ghsa":[{"id":"GHSA-9445-66j5-fhvj","title":"The telnet administrator service running on port 650 on Gigaset DX600A v41.00-175 devices does...","description":"The telnet administrator service running on port 650 on Gigaset DX600A v41.00-175 devices does not implement any lockout or throttling functionality. This situation (together with the weak password policy that forces a 4-digit password) allows remote attackers to easily obtain administrative access via brute-force attacks.","status":"published","published":"2022-05-24T17:43:28Z","modified":"2023-01-29T05:05:54Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-269","CWE-307"],"updated_at":"2026-11-02T14:45:54.221809Z"}],"nvd":[{"id":"CVE-2021-25309","description":"The telnet administrator service running on port 650 on Gigaset DX600A v41.00-175 devices does not implement any lockout or throttling functionality. This situation (together with the weak password policy that forces a 4-digit password) allows remote attackers to easily obtain administrative access via brute-force attacks.","status":"published","published":"2021-03-02T01:15:12.697Z","modified":"2026-06-17T03:41:48.123Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:P/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-307","CWE-521"],"updated_at":"2026-11-02T14:06:50.399901Z"}]}}