CVE-2021-24020

HIGH

FortiMail 6.2.0-6.2.7 and 6.4.0-6.4.4 - Unauthenticated Cryptographic Signature Bypass via Hash Digest Tampering

Title source: llm

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.

References (1)

Core 1

Core References

Vendor Advisory x_refsource_confirm

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

Scores

CVSS v3 7.5

EPSS 0.0017

EPSS Percentile 37.9%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact total

Details

CWE

CWE-347

Status published

Products (1)

fortinet/fortimail 6.2.0 - 6.2.7

Published Jul 09, 2021

Tracked Since Feb 18, 2026