What’s Vulnerable › Vulnerabilities
CVE-2021-26091
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2025-03-24 · updated 2026-06-17
- Weakness: CWE-338
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.
Affected products
- Fortinet FortiMail: from 6.2.0 before 6.4.5 — fixed in 6.4.5
How to fix
Upgrade to a fixed version: Fortinet FortiMail 6.4.5. Check the vendor advisory for mitigations.
References
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