Denial-of-Service (DoS) Vulnerability

More information

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 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 following person for bringing this issue to our attention.



  • Denial-of-Service of the antivirus engine when unpacking UPX file.
  • Status

  • Fixed
  • Risk level

  • Medium
  • Fix

  • No User action is required. The required fix has been published through automatic update channel with Capricorn update 2021-11-22_03
  • Affected products

  • F-Secure All 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
  • Platforms

  • All supported platforms for the affected products
  • Date issued

  • 26/11/2021
  • Security advisories
  • 2021
  • Medium