Missing required cryptographic step in FortiMail - CVE-2021-24020
Published: July 13, 2021
Vulnerability identifier: #VU54787
CSH Severity: High
CVSS v4: 9.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-24020
CWE-ID: CWE-325
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to bypass signature verification.
The vulnerability exists due to a missing cryptographic step in the implementation of the hash digest algorithm in FortiMail. A remote non-authenticated attacker can tamper with signed URLs by appending further data which allows bypass of signature verification.
Affected software
FortiMail
How to mitigate CVE-2021-24020
Install updates from vendor's website.
FortiMail - update to 6.4.5