{"id":"CVE-2021-26091","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-26091","generatedAt":"2026-10-27T20:21:06.175Z","title":"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…","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.","published":"2025-03-24T16:15:16.000Z","lastModified":"2026-06-17T03:42:51.000Z","status":"Analyzed","sourceIdentifier":"psirt@fortinet.com","cvss":{"version":"3.1","score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"},"cwe":["CWE-338"],"affected":["fortinet/fortimail"],"epss":{"score":0.00308,"percentile":0.23396,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.31%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://fortiguard.com/advisory/FG-IR-21-031","tags":["Vendor Advisory"],"source":"psirt@fortinet.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-26091","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}