What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-12-15 · updated 2026-06-17

Description

Microsoft BizTalk ESB Toolkit Spoofing Vulnerability

Affected products

• Microsoft Biztalk Esb Toolkit: 2.2, 2.3, 2.4
• Microsoft BizTalk ESB Toolkit 2.2: from 2.0 before 2.2 — fixed in 2.2
• Microsoft BizTalk ESB Toolkit 2.3: from 2.0 before 2.3 — fixed in 2.3
• Microsoft BizTalk ESB Toolkit 2.4: from 2.4 before 2.4 — fixed in 2.4

How to fix

Upgrade to a fixed version: Microsoft BizTalk ESB Toolkit 2.2 2.2; Microsoft BizTalk ESB Toolkit 2.3 2.3; Microsoft BizTalk ESB Toolkit 2.4 2.4. Check the vendor advisory for mitigations.

References

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

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