CVE-2021-26100 Weak cryptography in Fortinet FortiMail

What is CVE-2021-26100?

CVE-2021-26100 is a medium-severity vulnerability in Fortinet FortiMail, published on 9 Jul 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A missing cryptographic step in the Identity-Based Encryption service of FortiMail before 7.0.0 may allow an unauthenticated attacker who intercepts the encrypted messages to manipulate them in such a way that makes the tampering and the recovery of the plaintexts possible.

Weakness: CWE-347

Which versions are affected by CVE-2021-26100?

It affects 1 product.

Products include Fortinet Fortimail.

How do I fix CVE-2021-26100?

No fix has been published for CVE-2021-26100 yet. Limit exposure of the affected software until one is available.

Is CVE-2021-26100 being exploited?

There is no known exploitation of CVE-2021-26100 in the wild and no public exploit code.

Other vulnerabilities in Fortinet FortiMail

• CVE-2026-104286 Fortinet FortiMail Path Traversal Exploited Critical 9.8
• CVE-2021-36166 Auth bypass in Fortinet FortiMail Critical 9.8
• CVE-2021-24007 SQL injection in Fortinet FortiMail Critical 9.8
• CVE-2020-9294 Auth bypass in FortiMail Critical 9.8
• CVE-2023-47539 Auth bypass in FortiMail Critical 9.0

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-j84j-6h2f-jqj3.