---
cve: "CVE-2026-21671"
severity: "CRITICAL"
cvss: 9.1
epss: "1.3%"
vendor: "Veeam"
kev: false
exploited: false
published: "2026-03-12 15:16:13"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-08T21:36:57+02:00"
---

# CVE-2026-21671

> 9.1 CRITICAL

## Beschreibung

A vulnerability allowing an authenticated user with the Backup Administrator role to perform remote code execution (RCE) in high availability (HA) deployments of Veeam Backup & Replication.

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
```

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

## Referenzen

- <https://www.veeam.com/kb4831>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-21671) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_