CVE-2021-26090

Name: CVE-2021-26090
Creator: NVD / NIST
Published: 2021-07-12T13:15:07.827+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.33%

Last modified Jun 17, 2026

CVE-2021-26090 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. A missing release of memory after its effective lifetime vulnerability in the Webmail of FortiMail 6.4.0 through 6.4.4 and 6.2.0 through 6.2.6 may allow an unauthenticated remote attacker to exhaust available memory via specifically crafted login requests.. EPSS estimates a 1.33% chance of exploitation in the next 30 days.

Description

A missing release of memory after its effective lifetime vulnerability in the Webmail of FortiMail 6.4.0 through 6.4.4 and 6.2.0 through 6.2.6 may allow an unauthenticated remote attacker to exhaust available memory via specifically crafted login requests.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

1.33%

67.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-401

Affected Software

Vendor	Product	Versions
Fortinet	Fortimail	>= 6.2.0, <= 6.2.6
Fortinet	Fortimail	>= 6.4.0, < 6.4.5

References

https://fortiguard.com/advisory/FG-IR-21-042Vendor Advisory
https://fortiguard.com/advisory/FG-IR-21-042Vendor Advisory

Timeline

Published: Jul 12, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-26090?

How severe is CVE-2021-26090?

CVE-2021-26090 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.33% probability of exploitation in the next 30 days.

How do I fix CVE-2021-26090?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-26090?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST