CVE-2021-26116

Name: CVE-2021-26116
Creator: NVD / NIST
Published: 2022-04-06T16:15:07.967+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 0.60%

Last modified Jun 17, 2026

CVE-2021-26116 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. An improper neutralization of special elements used in an OS command vulnerability in the command line interpreter of FortiAuthenticator before 6.3.1 may allow an authenticated attacker to execute unauthorized commands via specifically crafted arguments to existing commands.. EPSS estimates a 0.60% chance of exploitation in the next 30 days.

Description

An improper neutralization of special elements used in an OS command vulnerability in the command line interpreter of FortiAuthenticator before 6.3.1 may allow an authenticated attacker to execute unauthorized commands via specifically crafted arguments to existing commands.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

0.60%

44.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-78

Affected Software

Vendor	Product	Versions
Fortinet	Fortiauthenticator	>= 5.0.0, < 6.3.1

References

https://fortiguard.com/advisory/FG-IR-21-068Vendor Advisory
https://fortiguard.com/advisory/FG-IR-21-068Vendor Advisory

Timeline

Published: Apr 6, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-26116?

How severe is CVE-2021-26116?

CVE-2021-26116 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.60% probability of exploitation in the next 30 days.

How do I fix CVE-2021-26116?

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-2021-26116?

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

Scan your code now

Source: NVD / NIST