---
cve: "CVE-2025-53770"
severity: "CRITICAL"
cvss: 9.8
epss: "100%"
vendor: "Microsoft"
kev: true
exploited: true
published: "2025-07-20 01:15:30"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-21T18:40:42+02:00"
---

# CVE-2025-53770

> 9.8 CRITICAL · ⚠️ CISA KEV (428 Tage) · 🔓 Exploited

## Beschreibung

Deserialization of untrusted data in on-premises Microsoft SharePoint Server allows an unauthorized attacker to execute code over a network.
Microsoft is aware that an exploit for CVE-2025-53770 exists in the wild.
Microsoft is preparing and fully testing a comprehensive update to address this vulnerability.  In the meantime, please make sure that the mitigation provided in this CVE documentation is in place so that you are protected from exploitation.

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:W/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 |

## Exploit-Evidenz

- [EDB-52405 — Microsoft SharePoint Server 2019 (16.0.10383.20020) - Remote Code Execution (RCE)](https://www.exploit-db.com/exploits/52405)

## Referenzen

- <https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53770>
- <https://arstechnica.com/security/2025/07/sharepoint-vulnerability-with-9-8-severity-rating-is-under-exploit-across-the-globe/>
- <https://github.com/kaizensecurity/CVE-2025-53770>
- <https://msrc.microsoft.com/blog/2025/07/customer-guidance-for-sharepoint-vulnerability-cve-2025-53770/>
- <https://news.ycombinator.com/item?id=44629710>
- <https://research.eye.security/sharepoint-under-siege/>
- <https://therecord.media/microsoft-sharepoint-zero-day-vulnerability-exploited-globally>
- <https://www.bleepingcomputer.com/news/microsoft/microsoft-sharepoint-zero-day-exploited-in-rce-attacks-no-patch-available/>
- <https://www.cisa.gov/news-events/alerts/2025/07/20/microsoft-releases-guidance-exploitation-sharepoint-vulnerability-cve-2025-53770>
- <https://www.darkreading.com/remote-workforce/microsoft-rushes-emergency-fix-exploited-sharepoint-toolshell-flaw>
- <https://www.forbes.com/sites/daveywinder/2025/07/20/microsoft-confirms-ongoing-mass-sharepoint-attack---no-patch-available/>
- <https://x.com/Shadowserver/status/1946900837306868163>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2025-53770) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_