CVE-2025-53729: Improper access control in Azure File Sync allows an authorized attacker to elevate privileges locally.

Routine

HIGH 7.8WATCHLISTUPGRADE

CVE-2025-53729 is a high-severity flaw (CVSS 7.8) 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

A fixed release or distro patch exists.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 78%)
CISA exploited list	No
Weakness	CWE-284
Published	2025-08-12
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

2025-08-12 18:15 UTCPublished CVE record published
2026-06-17 09:38 UTCUpdated Record last modified

microsoft azure file sync UPGRADE

Affected: >= 18.0.0.0 and < 18.3.0.0 · >= 19.0.0.0 and < 19.2.0.0 · >= 20.0.0.0 and < 20.1.0.0 · >= 21.0.0.0 and <= 21.1.0.0

Fixed in: 18.3.0.0, 19.2.0.0, 20.1.0.0

Safe to downgrade to: a release before 18.0.0.0

1. Check installed version

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

2. UPGRADE to 18.3.0.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade azure-file-sync

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade azure-file-sync

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 18.0.0.0 (Debian / Ubuntu)

apt-cache madison azure-file-sync sudo apt install azure-file-sync=<VERSION_BEFORE_18.0.0.0> sudo apt-mark hold azure-file-sync

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list azure-file-sync sudo dnf downgrade azure-file-sync-<VERSION_BEFORE_18.0.0.0> 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-2025-53729?

azure file sync: upgrade to 18.3.0.0, 19.2.0.0, 20.1.0.0. Exact commands for each OS are on this page.

Is CVE-2025-53729 being exploited?

CVE-2025-53729 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-2025-53729 affect?

CVE-2025-53729 affects azure file sync. Severity is high (CVSS 7.8). Improper access control in Azure File Sync allows an authorized attacker to elevate privileges locally.

How urgent is CVE-2025-53729?

Priority 38/100. 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-2025-29973 HIGH 7.0 DOWNGRADE Improper access control in Azure File Sync allows an authorized attacker to elevate privileges locally.

References

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