---
cve: "CVE-2021-31207"
severity: "MEDIUM"
cvss: 6.6
epss: "99.8%"
vendor: "Microsoft"
kev: true
exploited: true
published: "2021-05-11 19:11:41"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-03T21:52:54+02:00"
---

# CVE-2021-31207

> 6.6 MEDIUM · ⚠️ CISA KEV (1765 Tage) · 🔓 Exploited · 🧪 PoC

## Beschreibung

Microsoft Exchange Server Security Feature Bypass Vulnerability

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Hoch | good |
| PR Privilegien | Hoch | good |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Hoch | bad |

## Referenzen

- <https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31207>
- <https://www.zerodayinitiative.com/advisories/ZDI-21-819/>
- <http://packetstormsecurity.com/files/163895/Microsoft-Exchange-ProxyShell-Remote-Code-Execution.html>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2021-31207) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_