CVE-2021-42758

Name: CVE-2021-42758
Creator: NVD / NIST
Published: 2021-12-08T11:15:11.887+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 1.95%

Last modified Jun 17, 2026

CVE-2021-42758 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. An improper access control vulnerability [CWE-284] in FortiWLC 8.6.1 and below may allow an authenticated and remote attacker with low privileges to execute any command as an admin user with full access rights via bypassing the GUI restrictions.. EPSS estimates a 1.95% chance of exploitation in the next 30 days.

Description

An improper access control vulnerability [CWE-284] in FortiWLC 8.6.1 and below may allow an authenticated and remote attacker with low privileges to execute any command as an admin user with full access rights via bypassing the GUI restrictions.

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

1.95%

77.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-863

Affected Software

Vendor	Product	Versions
Fortinet	Fortiwlc	>= 8.2.4, <= 8.2.7
Fortinet	Fortiwlc	>= 8.3.0, <= 8.3.3
Fortinet	Fortiwlc	>= 8.5.0, <= 8.5.5
Fortinet	Fortiwlc	8.0.5
Fortinet	Fortiwlc	8.0.6
Fortinet	Fortiwlc	8.1.2
Fortinet	Fortiwlc	8.1.3
Fortinet	Fortiwlc	8.4.0
Fortinet	Fortiwlc	8.4.1
Fortinet	Fortiwlc	8.4.2
Fortinet	Fortiwlc	8.4.4
Fortinet	Fortiwlc	8.4.5
Fortinet	Fortiwlc	8.4.6
Fortinet	Fortiwlc	8.4.7
Fortinet	Fortiwlc	8.4.8
Fortinet	Fortiwlc	8.6.0
Fortinet	Fortiwlc	8.6.1

References

https://fortiguard.com/advisory/FG-IR-21-200Patch, Vendor Advisory
https://fortiguard.com/advisory/FG-IR-21-200Patch, Vendor Advisory

Timeline

Published: Dec 8, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-42758?

How severe is CVE-2021-42758?

CVE-2021-42758 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 1.95% probability of exploitation in the next 30 days.

How do I fix CVE-2021-42758?

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-2021-42758?

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

Scan your code now

Source: NVD / NIST