CVE-2021-41030

Name: CVE-2021-41030
Creator: NVD / NIST
Published: 2021-12-08T18:15:18.613+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.1/10EPSS 0.95%

Last modified Jun 17, 2026

CVE-2021-41030 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. An authentication bypass by capture-replay vulnerability [CWE-294] in FortiClient EMS versions 7.0.1 and below and 6.4.4 and below may allow an unauthenticated attacker to impersonate an existing user by intercepting and re-using valid SAML authentication messages.. EPSS estimates a 0.95% chance of exploitation in the next 30 days.

Description

An authentication bypass by capture-replay vulnerability [CWE-294] in FortiClient EMS versions 7.0.1 and below and 6.4.4 and below may allow an unauthenticated attacker to impersonate an existing user by intercepting and re-using valid SAML authentication messages.

Metrics

CVSS 3.1

9.1/10

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

EPSS Probability

0.95%

56.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-294

Affected Software

Vendor	Product	Versions
Fortinet	Forticlient Enterprise Management Server	>= 6.2.0, <= 6.2.9
Fortinet	Forticlient Enterprise Management Server	>= 6.4.0, <= 6.4.4
Fortinet	Forticlient Enterprise Management Server	7.0.0
Fortinet	Forticlient Enterprise Management Server	7.0.1

References

https://fortiguard.com/advisory/FG-IR-21-192Patch, Vendor Advisory
https://fortiguard.com/advisory/FG-IR-21-192Patch, Vendor Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2021-41030?

How severe is CVE-2021-41030?

CVE-2021-41030 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 0.95% probability of exploitation in the next 30 days.

How do I fix CVE-2021-41030?

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-2021-41030?

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

Scan your code now

Source: NVD / NIST