Is CVE-2021-26091 actively exploited?

CVE-2021-26091 has no public evidence of in-the-wild exploitation as of 2025-07-23.

What is the CVSS score for CVE-2021-26091?

CVE-2021-26091 has a CVSS score of 7.5 (HIGH severity). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

How do I patch CVE-2021-26091?

Patch guidance is available from fortinet security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2021-26091.

Fix CVE-2021-26091 - HIGH fortinet fortimail

Description

A use of a cryptographically weak pseudo-random number generator vulnerability in the authenticator of the Identity Based Encryption service of FortiMail 6.4.0 through 6.4.4, and 6.2.0 through 6.2.7 may allow an unauthenticated attacker to infer parts of users authentication tokens and reset their credentials.

CVSS Metrics

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack Vector: network
Complexity: low
Privileges: none
User Action: none
Scope: unchanged
Confidentiality: high
Integrity: none
Availability: none
Weaknesses: CWE-338

Metadata

Primary Vendor: FORTINET
Published: 3/24/2025
Last Modified: 7/23/2025
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

CVE-2021-26091

Description

CVSS Metrics

Metadata

Affected Products

Remediation Guidance

Executive Summary