CVE-2025-29973 | Microsoft Azure File Sync Elevation of Privilege Vulnerability

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

Published: 2025-05-13 Last update: 2025-05-19 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2025-29973 is rated Moderate Risk (42.9/100): CVSS High severity, with low exploitation likelihood (EPSS 0.21%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2025-29973

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-04-26 0.28% 0.21% -0.07%
2 2026-04-12 0.22% 0.28% +0.06%
3 2026-03-09 — 0.22% —

Full EPSS history (9 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2025-29973

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.0 3.1 HIGH
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.0 5.9 [email protected]

Weakness enumeration for CVE-2025-29973

Affected software / configurations for CVE-2025-29973

Vendor Product Version Raw CPE
microsoft azure_file_sync 19.0.0.0 cpe:2.3:a:microsoft:azure_file_sync:19.0.0.0:*:*:*:*:*:*:*
microsoft azure_file_sync 20.0.0.0 cpe:2.3:a:microsoft:azure_file_sync:20.0.0.0:*:*:*:*:*:*:*

References for CVE-2025-29973

cvelogic Threat Intelligence