Denial-of-Service (DoS) Vulnerability

More information

A denial-of-service (DoS) vulnerability was discovered in F-Secure Linux Security whereby the Fmlib component used in certain F-Secure products can crash while scanning fuzzed files. The exploit can be triggered remotely by an attacker. A successful attack will result in denial-of-service (DoS) of the antivirus engine.

This issue was reported to F-Secure through the Vulnerability Reward Program. No known exploit or attack has been seen in the wild.


WithSecure Corporation would like to thank following person for bringing this issue to our attention.

Antti Levomäki


Christian Jalio



  • Crash while scanning fuzzed files can cause denial-of-service of the antivirus engine.
  • Status

  • Fixed
  • Risk level

  • Medium
  • Fix

  • No user action is required. The required fix has been published through automatic update channel with Pisces release 2022-02-23_01.
  • Affected products

  • All F-Secure endpoint protection products for Mac F-Secure Linux Security (32-bit) F-Secure Linux Security 64 F-Secure Atlant F-Secure Internet Gatekeeper F-Secure Security Cloud
  • Platforms

  • Affected platforms all supported platforms for the affected products
  • Date issued

  • 3/1/2022
  • Security advisories
  • 2021
  • Medium