---
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: "2026-11-09T14:48:37+01:00"
---

# CVE-2025-53770

> 9.8 CRITICAL · ⚠️ CISA KEV (477 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.

## CNA-Record (Kanon, cvelistV5)

- CNA: **microsoft**
- State: PUBLISHED
- Stand: 2026-08-04 03:55:52
- CNA-CVSS: **9.8** (`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`)

## CISA-Anreicherung (vulnrichment/ADP)

- CISA KEV seit: **20.07.2025**
- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **active**
  - 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: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 |

## Schwachstellen-Klasse

- **CWE-502** — Deserialization of Untrusted Data
  The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.

## Angriffsmuster (CAPEC)

- [CAPEC-586 — Object Injection](https://capec.mitre.org/data/definitions/586.html) _(Severity: High)_

## Exploit-Evidenz

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

## BSI-Hinweise (deutsch)

- [Microsoft SharePoint (On-premises): Mehrere Schwachstellen](https://wid.cert-bund.de/portal/wid/sicherheitshinweis/WID-SEC-W-2025-1598) — _BSI-Einstufung: kritisch_
  Ein entfernter anonymer oder authentifizierter Angreifer kann mehrere Schwachstellen in Microsoft SharePoint Server 2019, Microsoft SharePoint Subscription Edition und Microsoft SharePoint Server 2016 ausnutzen, um beliebigen Code auszuführen und Spoofing-Angriffe durchzuführen.

## 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/sicherheitsluecken/cve-2025-53770/) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_