CVE-2021-41018

Name: CVE-2021-41018
Creator: NVD / NIST
Published: 2022-02-02T12:15:08.197+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 3.32%

Last modified Jun 17, 2026

CVE-2021-41018 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. A improper neutralization of special elements used in an os command ('os command injection') in Fortinet FortiWeb version 6.4.1 and below, 6.3.15 and below allows attacker to execute unauthorized code or commands via crafted HTTP requests.. EPSS estimates a 3.32% chance of exploitation in the next 30 days.

Description

A improper neutralization of special elements used in an os command ('os command injection') in Fortinet FortiWeb version 6.4.1 and below, 6.3.15 and below allows attacker to execute unauthorized code or commands via crafted HTTP requests.

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

3.32%

87.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-78

Affected Software

Vendor	Product	Versions
Fortinet	Fortiweb	>= 6.2.0, < 6.2.7
Fortinet	Fortiweb	>= 6.3.0, < 6.3.16
Fortinet	Fortiweb	>= 6.4.0, < 6.4.2

References

https://fortiguard.com/advisory/FG-IR-21-166Vendor Advisory
https://fortiguard.com/advisory/FG-IR-21-166Vendor Advisory

Timeline

Published: Feb 2, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-41018?

How severe is CVE-2021-41018?

CVE-2021-41018 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 3.32% probability of exploitation in the next 30 days.

How do I fix CVE-2021-41018?

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-2021-41018?

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

Scan your code now

Source: NVD / NIST