CVE-2021-27506 Denial of service in n/a
Attackers can cause a denial of service in Storsmshield Network Security devices by submitting malformed PNG files to the embedded ClamAV engine.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2021-27506?
CVE-2021-27506 is a medium-severity denial of service vulnerability in Clamav Clamav, published on 19 Mar 2021. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official 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.
Which versions are affected by CVE-2021-27506?
It affects 3 products.
Products include Clamav Clamav, Netasq Project Netasq, Stormshield Stormshield Network Security.
How do I fix CVE-2021-27506?
Upgrade to a fixed version.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2021-27506 being exploited?
There is no known exploitation of CVE-2021-27506 in the wild and no public exploit code.
Other vulnerabilities in Clamav Clamav
Sources
Also known as GHSA-rfvf-cm38-cvx4, OESA-2021-1187.