CVE-2021-40833 : Security Advisory and Response

This article provides details about a Denial-of-Service (DoS) vulnerability affecting F-Secure antivirus engine.

Understanding CVE-2021-40833

This section delves into the specifics of the CVE-2021-40833 vulnerability.

What is CVE-2021-40833?

A vulnerability in F-Secure antivirus engine allows a denial-of-service attack when unpacking UPX files, exploitable remotely.

The Impact of CVE-2021-40833

The successful exploitation of this vulnerability can lead to a denial-of-service for the antivirus engine, posing a medium severity risk.

Technical Details of CVE-2021-40833

Explore the technical aspects of CVE-2021-40833.

Vulnerability Description

The flaw affects F-Secure endpoint protection products on Windows, Mac, and Linux, including versions up to the latest.

Affected Systems and Versions

Vendor: F-Secure
Affected Products: F-Secure endpoint protection products on Windows and Mac, F-Secure Linux Security, F-Secure Internet Gatekeeper, and F-Secure Atlant
Affected Versions: All Versions

Exploitation Mechanism

Attack Complexity: Low
Attack Vector: Network
Privileges Required: Low
User Interaction: Required
Confidentiality, Integrity, Availability Impact: Low
Scope: Unchanged
Vector String: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L

Mitigation and Prevention

Learn how to address CVE-2021-40833 effectively.

Immediate Steps to Take

No user action is required as the fix has been automatically distributed through the update channel.

Long-Term Security Practices

Ensure regular updates of F-Secure products for ongoing protection.

Patching and Updates

Stay vigilant for security updates, especially related to the Capricorn update released on 2021-11-22.