Security Advisories

CVE-2021-33597: Denial-of-Service (DoS) Vulnerability


Crash while scanning fuzzed files can cause denial-of-service (DoS) of the antivirus engine.



FIX: No user action is required. The required fix has been published through automatic update channel with Capricorn update 2021-07-26_07.

Affected Products

Corporate Products:

  • All F-Secure endpoint protection products on Windows and Mac
  • All F-Secure endpoint protection products on Linux
  • F-Secure Security Cloud


  • All supported platforms for the affected products

More Information

A denial-of-service (DoS) vulnerability was discovered in F-Secure Atlant whereby the SAVAPI 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.


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

Advisory changes

Date Changes
2021-08-09 First advisory published.
2021-09-07 Changed an entry under Affected Products from 'F-Secure Linux Security' to 'All F-Secure endpoint protection products on Linux'. 

Date Issued: 2021-08-09

Date Updated: 2021-09-07