---
cve: "CVE-2021-26893"
severity: "CRITICAL"
cvss: 9.8
epss: "7%"
vendor: "Microsoft"
kev: false
exploited: false
published: "2021-03-11 15:42:59"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-10-22T21:22:28+02:00"
---

# CVE-2021-26893

> 9.8 CRITICAL

## Beschreibung

Windows DNS Server Remote Code Execution Vulnerability

## CNA-Record (Kanon, cvelistV5)

- CNA: **microsoft**
- State: PUBLISHED
- Stand: 2026-08-19 16:30:34
- CNA-CVSS: **9.8** (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C`)

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **none**
  - Automatable: **yes**
  - Technical Impact: **total**

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:N/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 | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Hoch | bad |

## Referenzen

- <https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-26893>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/sicherheitsluecken/cve-2021-26893/) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_