{"id":"CVE-2021-26091","aliases":["EUVD-2021-12912","GHSA-pmxq-4hqc-9hr4"],"status":"published","title":"A use of a cryptographically weak pseudo-random number generator vulnerability in the...","description":"A use of a cryptographically weak pseudo-random number generator vulnerability in the authenticator of the Identity Based Encryption service of FortiMail 6.4.0 through 6.4.4, and 6.2.0 through 6.2.7 may allow an unauthenticated attacker to infer parts of users authentication tokens and reset their credentials.","severity":{"version":"3.1","score":6.9,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:U/RC:C","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00308,"percentile":0.23837,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-338"],"published":"2025-03-24T15:37:58Z","modified":"2026-06-17T03:42:50Z","products":[{"vendor":"fortinet","product":"fortimail"}],"references":[{"url":"https://fortiguard.com/advisory/FG-IR-21-031","tags":["Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-26091"},{"url":"https://github.com/advisories/GHSA-pmxq-4hqc-9hr4"}],"sources":{"cve":[{"id":"CVE-2021-26091","description":"A use of a cryptographically weak pseudo-random number generator vulnerability in the authenticator of the Identity Based Encryption service of FortiMail 6.4.0 through 6.4.4, and 6.2.0 through 6.2.7 may allow an unauthenticated attacker to infer parts of users authentication tokens and reset their credentials.","status":"published","published":"2025-03-24T15:37:58.37Z","modified":"2025-03-31T18:11:58.179Z","cvss":[{"version":"3.1","score":6.9,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:U/RC:C","level":"medium","assessor":"cna"}],"cwes":["CWE-338"],"updated_at":"2026-11-02T14:32:57.368269Z"}],"euvd":[{"id":"EUVD-2021-12912","description":"A use of a cryptographically weak pseudo-random number generator vulnerability in the authenticator of the Identity Based Encryption service of FortiMail 6.4.0 through 6.4.4, and 6.2.0 through 6.2.7 may allow an unauthenticated attacker to infer parts of users authentication tokens and reset their credentials.","status":"published","published":"2025-03-24T15:37:58Z","modified":"2025-03-31T18:11:58Z","cvss":[{"version":"3.1","score":6.9,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:U/RC:C","level":"medium"}],"updated_at":"2026-11-02T20:52:46.2495Z"}],"ghsa":[{"id":"GHSA-pmxq-4hqc-9hr4","title":"A use of a cryptographically weak pseudo-random number generator vulnerability in the...","description":"A use of a cryptographically weak pseudo-random number generator vulnerability in the authenticator of the Identity Based Encryption service of FortiMail 6.4.0 through 6.4.4, and 6.2.0 through 6.2.7 may allow an unauthenticated attacker to infer parts of users authentication tokens and reset their credentials.","status":"published","published":"2025-03-24T18:31:01Z","modified":"2025-03-24T18:31:10Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"cwes":["CWE-338"],"updated_at":"2026-11-02T15:00:25.317617Z"}],"nvd":[{"id":"CVE-2021-26091","description":"A use of a cryptographically weak pseudo-random number generator vulnerability in the authenticator of the Identity Based Encryption service of FortiMail 6.4.0 through 6.4.4, and 6.2.0 through 6.2.7 may allow an unauthenticated attacker to infer parts of users authentication tokens and reset their credentials.","status":"published","published":"2025-03-24T16:15:16.45Z","modified":"2026-06-17T03:42:50.777Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"secondary"}],"cwes":["CWE-338"],"updated_at":"2026-11-02T14:07:09.005706Z"}]}}