CVE-2021-43080

Name: CVE-2021-43080
Creator: NVD / NIST
Published: 2022-09-06T16:15:08.407+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10EPSS 0.36%

Last modified Jun 17, 2026

CVE-2021-43080 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. An improper neutralization of input during web page generation vulnerability [CWE-79] in FortiOS version 7.2.0, version 6.4.0 through 6.4.9, version 7.0.0 through 7.0.5 may allow an authenticated attacker to perform a stored cross site scripting (XSS) attack through the URI parameter via the Threat Feed IP address section of the Security Fabric External connectors.. EPSS estimates a 0.36% chance of exploitation in the next 30 days.

Description

An improper neutralization of input during web page generation vulnerability [CWE-79] in FortiOS version 7.2.0, version 6.4.0 through 6.4.9, version 7.0.0 through 7.0.5 may allow an authenticated attacker to perform a stored cross site scripting (XSS) attack through the URI parameter via the Threat Feed IP address section of the Security Fabric External connectors.

Metrics

CVSS 3.1

5.4/10

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

EPSS Probability

0.36%

27.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Fortinet	Fortios	>= 6.4.0, < 6.4.10
Fortinet	Fortios	>= 7.0.0, < 7.0.6
Fortinet	Fortios	7.2.0

References

https://fortiguard.com/psirt/FG-IR-21-222Vendor Advisory
https://fortiguard.com/psirt/FG-IR-21-222Vendor Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2021-43080?

How severe is CVE-2021-43080?

CVE-2021-43080 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 0.36% probability of exploitation in the next 30 days.

How do I fix CVE-2021-43080?

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-2021-43080?

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

Scan your code now

Source: NVD / NIST