CVE-2021-24020

9.8 criticalEPSS 0.6%

Critical (9.8) in fortinet fortimail. EPSS 0.6% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

9.8 critical

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

EPSS: 0.6% chance of exploitation in the next 30 days; higher than 49% of CVEs (scores of 2026-10-31)
CWE: CWE-347
Published: 2021-07-09
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

fortinet:fortimail

References

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

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