What’s Vulnerable › Vulnerabilities

CVE-2021-43225: Bot Framework SDK Remote Code Execution Vulnerability

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-12-15 · updated 2026-06-17

Description

Bot Framework SDK Remote Code Execution Vulnerability

Affected products

• Microsoft Bot Framework SDK for .NET Framework: all versions
• Microsoft Bot Framework SDK for .NET Framework: from 4.0.0 before 4.15.0 — fixed in 4.15.0

How to fix

Upgrade to a fixed version: Microsoft Bot Framework SDK for .NET Framework 4.15.0. Check the vendor advisory for mitigations.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-43225
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-43225

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