---
cve: "CVE-2021-27646"
severity: "CRITICAL"
cvss: 9.8
epss: "3.8%"
vendor: "Synology"
kev: false
exploited: false
published: "2021-03-12 07:15:13"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-08T12:17:04+02:00"
---

# CVE-2021-27646

> 9.8 CRITICAL

## Beschreibung

Use After Free vulnerability in iscsi_snapshot_comm_core in Synology DiskStation Manager (DSM) before 6.2.3-25426-3 allows remote attackers to execute arbitrary code via crafted web requests.

## CVSS-Vektor

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

| 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://www.synology.com/security/advisory/Synology_SA_20_26>
- <https://www.zerodayinitiative.com/advisories/ZDI-21-340/>
- <https://www.zerodayinitiative.com/advisories/ZDI-21-339/>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2021-27646) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_