CVE-2021-27506

Name: CVE-2021-27506
Creator: NVD / NIST
Published: 2021-03-19T15:15:12.65+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 1.31%

Last modified Jun 17, 2026

CVE-2021-27506 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. The ClamAV Engine (version 0.103.1 and below) component embedded in Storsmshield Network Security (SNS) is subject to DoS in case of parsing of malformed png files. This affect Netasq versions 9.1.0 to 9.1.11 and SNS versions 1.0.0 to 4.2.0. EPSS estimates a 1.31% chance of exploitation in the next 30 days.

Description

The ClamAV Engine (version 0.103.1 and below) component embedded in Storsmshield Network Security (SNS) is subject to DoS in case of parsing of malformed png files. This affect Netasq versions 9.1.0 to 9.1.11 and SNS versions 1.0.0 to 4.2.0. This issue is fixed in SNS 3.7.19, 3.11.7 and 4.2.1.

Metrics

CVSS 3.1

5.5/10

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

EPSS Probability

1.31%

67.0th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Netasq Project	Netasq	>= 9.1.0, <= 9.1.11
Stormshield	Stormshield Network Security	>= 1.0, <= 4.2.0
Clamav	Clamav	<= 0.103.1

References

https://advisories.stormshield.eu/2021-003/Broken Link, Vendor Advisory
https://blog.clamav.net/2021/02/clamav-01031-patch-release.htmlVendor Advisory
https://advisories.stormshield.eu/2021-003/Broken Link, Vendor Advisory
https://blog.clamav.net/2021/02/clamav-01031-patch-release.htmlVendor Advisory

Timeline

Published: Mar 19, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-27506?

How severe is CVE-2021-27506?

CVE-2021-27506 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 1.31% probability of exploitation in the next 30 days.

How do I fix CVE-2021-27506?

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-2021-27506?

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

Scan your code now

Source: NVD / NIST