# CVE-2021-31207

> Microsoft Exchange Server Security Feature Bypass Vulnerability

- **CVSS:** 6.6 (MEDIUM)
- **EPSS:** 93.8%
- **CISA KEV:** yes (known ransomware use)
- **CWE:** CWE-434

Canonical: https://intel.threadlinqs.com/cve/CVE-2021-31207
Full threat coverage + IOCs via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp