CVE-2021-32593

Name: CVE-2021-32593
Creator: NVD / NIST
Published: 2022-04-06T10:15:07.983+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.55%

Last modified Jun 17, 2026

CVE-2021-32593 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. A use of a broken or risky cryptographic algorithm vulnerability [CWE-327] in the Dynamic Tunnel Protocol of FortiWAN before 4.5.9 may allow an unauthenticated remote attacker to decrypt and forge protocol communication messages.. EPSS estimates a 0.55% chance of exploitation in the next 30 days.

Description

A use of a broken or risky cryptographic algorithm vulnerability [CWE-327] in the Dynamic Tunnel Protocol of FortiWAN before 4.5.9 may allow an unauthenticated remote attacker to decrypt and forge protocol communication messages.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

0.55%

41.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-327

Affected Software

Vendor	Product	Versions
Fortinet	Fortiwan	<= 4.5.8

References

https://fortiguard.com/psirt/FG-IR-21-070Patch, Vendor Advisory
https://fortiguard.com/psirt/FG-IR-21-070Patch, Vendor Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2021-32593?

How severe is CVE-2021-32593?

CVE-2021-32593 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.55% probability of exploitation in the next 30 days.

How do I fix CVE-2021-32593?

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-2021-32593?

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

Scan your code now

Source: NVD / NIST