Denial-of-Service (DoS) Vulnerability

More information

A Denial-of-Service (DoS) vulnerability was discovered in F-Secure Linux Security whereby the FSAVD component used in certain F-Secure products can crash while scanning larger packages/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.


F-Secure Corporation would like to thank Antti Levomäki and Christian Jalio from Forcepoint for bringing this issue to our attention. 

Antti Levomäki



Christian Jalio




  • Crash while scanning fuzzed files can cause Denial-of-Service of antivirus engine.
  • Status

  • Resolved
  • Risk level

  • Medium
  • Fix

  • No user action is required. The required fix has been published through automatic update channel with Capricorn update 2021-04-29_07.
  • Affected products

  • Corporate Products: All F-Secure endpoint protection products on Windows, Mac and Linux F-Secure Security Cloud F-Secure Elements for Microsoft 365 F-Secure Cloud Protection for Salesforce
  • Platforms

  • All supported platforms for the affected products
  • Date issues

  • 3/6/2021
  • Security advisories
  • 2021
  • Medium