CVE-2021-40832 Denial-of-Service (DoS) Vulnerability

Medium 5.5 Published 8 Oct 2021 Updated 4 Aug 2024

Remote attackers can crash the F-Secure Anti-Virus engine by sending specially crafted files, causing a denial of service.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2021-40832?

CVE-2021-40832 is a medium-severity denial of service vulnerability in F-Secure endpoint protection products on Windows and Mac. F-Secure Linux Security (32-bit) F-Secure Linux Security 64 F-Secure Atlant F-Secure Cloud Protection for Salesforce and Cloud Protection for Microsoft Office 365, published on 8 Oct 2021. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

Official description

A Denial-of-Service (DoS) vulnerability was discovered in F-Secure Atlant whereby the AVRDL unpacking module component used in certain F-Secure products can crash while scanning a fuzzed files. The exploit can be triggered remotely by an attacker. A successful attack will result in Denial-of-Service (DoS) of the Anti-Virus engine.

Which versions are affected by CVE-2021-40832?

It affects 7 products.

Products include F-Secure Atlant, F-Secure Cloud Protection for Salesforce, F-Secure Elements Endpoint Detection and Response, F-Secure Elements Endpoint Protection, F-Secure Elements for Microsoft 365, F-Secure Internet Gatekeeper and 1 more.

How do I fix CVE-2021-40832?

No fix has been published for CVE-2021-40832 yet. Limit exposure of the affected software until one is available.

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-2021-40832 being exploited?

There is no known exploitation of CVE-2021-40832 in the wild and no public exploit code.

Sources

Also known as GHSA-52rq-v884-rfrr.