CVE-2025-29973: Improper access control in Azure File Sync allows an authorized attacker to elevate privileges locally.

Routine

HIGH 7.0WATCHLISTDOWNGRADE

CVE-2025-29973 is a high-severity flaw (CVSS 7.0) affecting azure file sync. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

High severity
On your watchlist

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.0 (High)
Attack vector	Local
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 76%)
CISA exploited list	No
Weakness	CWE-284
Published	2025-05-13
Last modified	2026-06-17

Publisher (CNA): Microsoft Corporation · Vendor: microsoft

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-05-13 17:15 UTCPublished CVE record published
2026-06-17 09:06 UTCUpdated Record last modified

microsoft azure file sync DOWNGRADE

Affected: 19.0.0.0 · 20.0.0.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 19.0.0.0

1. Check installed version

apt-cache policy azure-file-sync || rpm -q azure-file-sync || azure-file-sync --version

2. No fixed release: DOWNGRADE to a release before 19.0.0.0 (Debian / Ubuntu)

apt-cache madison azure-file-sync sudo apt install azure-file-sync=<VERSION_BEFORE_19.0.0.0> sudo apt-mark hold azure-file-sync

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list azure-file-sync sudo dnf downgrade azure-file-sync-<VERSION_BEFORE_19.0.0.0> sudo dnf versionlock add azure-file-sync

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-29973?

azure file sync: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-29973 being exploited?

CVE-2025-29973 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-29973 affect?

CVE-2025-29973 affects azure file sync. Severity is high (CVSS 7.0). Improper access control in Azure File Sync allows an authorized attacker to elevate privileges locally.

How urgent is CVE-2025-29973?

Priority 36/100. High severity; On your watchlist

Software pages

Azure vulnerabilities

Related CVEs

CVE-2024-35253 MEDIUM 4.4 UPGRADE Microsoft Azure File Sync Elevation of Privilege Vulnerability
CVE-2025-53729 HIGH 7.8 UPGRADE Improper access control in Azure File Sync allows an authorized attacker to elevate privileges locally.

References

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