CVE-2021-40836 Denial-of-Service (DoS) Vulnerability
Remote attackers can cause denial-of-service in F-Secure antivirus engines by sending malicious Microsoft Outlook PST files for scanning.
- 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-2021-40836?
CVE-2021-40836 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 Internet Gatekeeper, published on 22 Dec 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 vulnerability affecting F-Secure antivirus engine was discovered whereby scanning MS outlook .pst files can lead to denial-of-service. The vulnerability can be exploited remotely by an attacker. A successful attack will result in denial-of-service of the antivirus engine.
Which versions are affected by CVE-2021-40836?
It affects 6 products.
Products include F-Secure Atlant, F-Secure Elements Endpoint Detection and Response, F-Secure Elements Endpoint Protection, F-Secure Internet Gatekeeper, F-Secure Linux Security, F-Secure Linux Security 64.
How do I fix CVE-2021-40836?
No fix has been published for CVE-2021-40836 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-2021-40836 being exploited?
There is no known exploitation of CVE-2021-40836 in the wild and no public exploit code.
Other vulnerabilities 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 Internet Gatekeeper
Sources
Also known as GHSA-mvh9-66vv-hxxf.