CVE-2021-24020

Description

A missing cryptographic step in the implementation of the hash digest algorithm in FortiMail 6.4.0 through 6.4.4, and 6.2.0 through 6.2.7 may allow an unauthenticated attacker to tamper with signed URLs by appending further data which allows bypass of signature verification.

Category

7.5
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.17%
Vendor Advisory fortiguard.com
Affected: Fortinet Fortinet FortiMail
Published at:
Updated at:

References

Link Tags
https://fortiguard.com/advisory/FG-IR-21-027 vendor advisory

Frequently Asked Questions

What is the severity of CVE-2021-24020?
CVE-2021-24020 has been scored as a high severity vulnerability.
How to fix CVE-2021-24020?
To fix CVE-2021-24020, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-24020 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2021-24020 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-24020?
CVE-2021-24020 affects Fortinet Fortinet FortiMail.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.