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TI-2025-21349 Aliases CVE-2025-29973GHSA-2c3j-mwh6-x6f2

Microsoft Azure File Sync Elevation of Privilege Vulnerability

Priority LOW 33CWE-284Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
High
Impact type
Privilege escalation
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from Microsoft.

Summary

Improper access control in Azure File Sync allows an authorized attacker to elevate privileges locally.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00312 24th percentileScored 2026-11-07
Fix Fixed Azure File Sync (Microsoft): 26100

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
MicrosoftAzure File Sync1.0.0 to before 2610026100Patch availableCNA
  • Azure File Sync VendorMicrosoft Affected 1.0.0 to before 26100 Fixed in 26100 Patch available CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:microsoft:azure_file_sync:19.0.0.0:*:*:*:*:*:*:*19.0.0.0VulnerableMicrosoft
cpe:2.3:a:microsoft:azure_file_sync:20.0.0.0:*:*:*:*:*:*:*20.0.0.0VulnerableMicrosoft
  • cpe:2.3:a:microsoft:azure_file_sync:19.0.0.0:*:*:*:*:*:*:* Versions 19.0.0.0 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:azure_file_sync:20.0.0.0:*:*:*:*:*:*:* Versions 20.0.0.0 Vulnerable ·Microsoft

Remediation

  • Fix · CNA Azure File Sync (Microsoft) Fixed in 26100

Vendor assessments

Microsoft

Microsoft's page for this CVE →

Impact
Elevation of Privilege
Exploited
No
Publicly disclosed
No
Exploitability
Exploitation Unlikely
ProductStatusPlan or fix
Azure File Sync v19Fixed 26100 · N/A
Azure File Sync v20Fixed 5041884 · N/A

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-29973
  2. 2026-10-03 Alias added: GHSA-2c3j-mwh6-x6f2

References

Patch 1

  • TI-2025-33640 Microsoft Azure File Sync Elevation of Privilege Vulnerability CVSS 3.1HIGH 7.8
  • TI-2024-14157 Microsoft Azure File Sync Elevation of Privilege Vulnerability CVSS 3.1MEDIUM 5.3
  • TI-2024-23320 Microsoft Azure File Sync Elevation of Privilege Vulnerability CVSS 3.1MEDIUM 4.4

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences