# CVE-2021-26857

> Microsoft Exchange Server Remote Code Execution Vulnerability

- **CVSS:** 7.8 (HIGH)
- **EPSS:** 44.8%
- **CISA KEV:** yes (known ransomware use)
- **CWE:** CWE-502

Canonical: https://intel.threadlinqs.com/cve/CVE-2021-26857
Full threat coverage + IOCs via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp