Use of cryptographically weak pseudo-random number generator (PRNG) in FortiMail - CVE-2021-26091
Published: July 13, 2021
Vulnerability identifier: #VU54775
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-26091
CWE-ID: CWE-338
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to reset credentials of other users.
The vulnerability exists due to usage of weak pseudo-random number generator in the authenticator of FortiMail Identity Based Encryption service. A remote attacker can infer parts of users authentication tokens and reset their credentials.
Affected software
FortiMail
How to mitigate CVE-2021-26091
Install updates from vendor's website.
FortiMail - update to 6.4.5