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## https://sploitus.com/exploit?id=8795BCFC-C1D9-5B5B-ABAA-E36EC7BCEA9A
# CVE-2025-53770 Security Advisory
## Microsoft SharePoint Server Remote Code Execution Vulnerability
---
### ๐จ Executive Summary
**CVE-2025-53770** is a **critical remote code execution vulnerability** in on-premises Microsoft SharePoint Server, with a CVSS score of **9.8/10**. This **zero-day vulnerability is actively being exploited in the wild**, allowing unauthenticated attackers to execute arbitrary code remotely.
**Key Facts:**
- **Attack Vector:** Network (Internet-facing)
- **Authentication:** None required
- **User Interaction:** None required
- **Impact:** Full system compromise possible
- **Affected:** On-premises SharePoint Server installations
- **Not Affected:** SharePoint Online / Microsoft 365
---
### ๐ Vulnerability Details
**Type:** Deserialization of Untrusted Data ([CWE-502](http://cwe.mitre.org/data/definitions/502.html))
**Attack Scenario:**
```
Attacker โ Internet โ SharePoint Server โ Remote Code Execution โ System Compromise
```
**CVSS v3.1 Vector:** `AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
| Metric | Value | Impact |
|--------|-------|--------|
| Attack Vector | Network | Remotely exploitable |
| Attack Complexity | Low | Easy to exploit |
| Privileges Required | None | No authentication needed |
| User Interaction | None | Fully automated attack |
| Confidentiality | High | Complete data access |
| Integrity | High | Full system modification |
| Availability | High | Complete system denial |
---
### ๐ฅ Impact
- โ
**Remote Code Execution** - Attackers can run arbitrary code
- โ
**Data Breach** - Access to all SharePoint documents and data
- โ
**Lateral Movement** - Pivot to other systems in the network
- โ
**Ransomware Risk** - Potential for ransomware deployment
- โ
**Business Disruption** - Service availability impact
---
### ๐ฏ Affected Systems
#### โ ๏ธ Vulnerable
- Microsoft SharePoint Server (On-Premises)
- All unpatched versions
#### โ
Not Vulnerable
- SharePoint Online (Cloud)
- Microsoft 365 SharePoint
---
### ๐ก๏ธ Mitigation
#### Immediate Actions Required
1. **Apply Microsoft's Interim Mitigation**
- Follow official guidance: [MSRC Blog](https://msrc.microsoft.com/blog/2025/07/customer-guidance-for-sharepoint-vulnerability-cve-2025-53770/)
- Review: [Microsoft Update Guide](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53770)
2. **Reduce Attack Surface**
- Restrict internet access to SharePoint servers
- Implement firewall rules
- Require VPN for remote access
3. **Monitor for Exploitation**
- Review server logs for suspicious activity
- Deploy intrusion detection signatures
- Monitor network traffic patterns
4. **Prepare for Patching**
- Microsoft is developing a comprehensive patch
- Test mitigation in non-production first
- Plan maintenance window for patch deployment
---
### ๐ Quick Checklist
#### Security Team
- [ ] Inventory all SharePoint Server instances
- [ ] Apply Microsoft's interim mitigation
- [ ] Configure network-level controls
- [ ] Review logs for indicators of compromise
- [ ] Scan for vulnerabilities
- [ ] Prepare incident response plan
#### IT Operations
- [ ] Document all SharePoint servers
- [ ] Test mitigation procedures
- [ ] Schedule emergency maintenance window
- [ ] Ensure backup integrity
- [ ] Prepare rollback procedures
#### Management
- [ ] Understand business risk exposure
- [ ] Allocate resources for remediation
- [ ] Review business continuity plans
- [ ] Prepare stakeholder communications
---
### ๐จ CISA Alert
This CVE is listed in **CISA's Known Exploited Vulnerabilities (KEV) Catalog**.
- **Federal agencies** must comply with [BOD 22-01](https://www.cisa.gov/binding-operational-directive-22-01)
- **All organizations** should treat as high-priority
- **Reference:** [CISA KEV Catalog](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-53770)
---
### ๐ Official Resources
#### Microsoft
- [MSRC Customer Guidance](https://msrc.microsoft.com/blog/2025/07/customer-guidance-for-sharepoint-vulnerability-cve-2025-53770/)
- [Microsoft Security Update Guide](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53770)
#### Government & Security Organizations
- [CISA Alert](https://www.cisa.gov/news-events/alerts/2025/07/20/microsoft-releases-guidance-exploitation-sharepoint-vulnerability-cve-2025-53770)
- [NVD Database](https://nvd.nist.gov/vuln/detail/CVE-2025-53770)
#### Security Research
- [Eye Security - SharePoint Under Siege](https://research.eye.security/sharepoint-under-siege/)
- [Kaizen Security - Technical Details](https://github.com/kaizensecurity/CVE-2025-53770)
#### News Coverage
- [Ars Technica](https://arstechnica.com/security/2025/07/sharepoint-vulnerability-with-9-8-severity-rating-is-under-exploit-across-the-globe/)
- [BleepingComputer](https://www.bleepingcomputer.com/news/microsoft/microsoft-sharepoint-zero-day-exploited-in-rce-attacks-no-patch-available/)
- [The Record](https://therecord.media/microsoft-sharepoint-zero-day-vulnerability-exploited-globally)
---
### ๐
Timeline
| Date | Event |
|------|-------|
| July 2025 | Vulnerability discovered in active exploitation |
| July 20, 2025 | Microsoft releases initial advisory |
| July 20, 2025 | Added to CISA KEV Catalog |
| Present | Microsoft developing comprehensive patch |
---
### ๐ Support
**Report Security Incidents:**
- Microsoft Support: [https://support.microsoft.com](https://support.microsoft.com)
- MSRC: [https://msrc.microsoft.com](https://msrc.microsoft.com)
---
### โก Quick Reference
```
โโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโ
โ CVE-2025-53770 QUICK FACTS โ
โ โโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโฃ
โ Severity: CRITICAL (9.8/10) โ
โ Status: Actively Exploited in the Wild โ
โ Affected: SharePoint Server (On-Premises) โ
โ Not Affected: SharePoint Online / M365 โ
โ Auth Required: NO - Unauthenticated RCE โ
โ Patch: In Development (Mitigation Available)โ
โ CISA KEV: YES โ
โ โ
โ IMMEDIATE ACTIONS: โ
โ โ Apply Microsoft's interim mitigation NOW โ
โ โ Restrict network access to SharePoint โ
โ โ Monitor for exploitation attempts โ
โ โ Prepare for emergency patching โ
โโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโ
```
---
**Document Version:** 2.0 (Condensed)
**Last Updated:** January 16, 2026
**Classification:** Public
---
### โ ๏ธ Disclaimer
This document is provided for informational purposes only. Information is based on publicly available sources and may not be complete or current. Organizations should refer to official Microsoft guidance and consult their security teams before implementing changes.
---
**For detailed technical analysis and comprehensive guidance, refer to the official Microsoft and CISA advisories linked above.**