Cryptographically Weak Pseudo-Random Number Generator in FortiMail Authentication
CVE-2021-26091

6.9MEDIUM

Key Information:

Vendor

Fortinet
Status
Fortimail
Vendor
CVE Published:
24 March 2025

What is CVE-2021-26091?

A vulnerability exists in FortiMail due to the use of a cryptographically weak pseudo-random number generator within its authentication system. This flaw may enable an unauthenticated attacker to deduce segments of user authentication tokens, ultimately allowing them to reset user credentials and potentially compromise user accounts. Awareness and mitigation strategies should be applied to safeguard against unauthorized access. For more information, refer to the advisory from FortiGuard.

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Affected Version(s)

FortiMail 6.4.0 <= 6.4.4

FortiMail 6.2.0 <= 6.2.9

FortiMail 6.2.0 < 6.2.*

References

https://fortiguard.com/advisory/FG-IR-21-031

CVSS V3.1

Score:
6.9
Severity:
MEDIUM
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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