CVE-2021-47807: Sync Breeze 13.6.18 contains an unquoted service path vulnerability in its Windows service configuration that

Routine

HIGH 7.8DOWNGRADE

CVE-2021-47807 is a high-severity flaw (CVSS 7.8) affecting sync breeze. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Sync Breeze 13.6.18 contains an unquoted service path vulnerability in its Windows service configuration that allows local attackers to potentially execute arbitrary code. Attackers can exploit the unquoted path in service binaries located in 'Program Files' directories to inject malicious executables and escalate privileges.

Why this priority

High severity
Public exploit reference

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

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 87%)
CISA exploited list	No
Weakness	CWE-428
Published	2026-01-16
Last modified	2026-06-17

Publisher (CNA): VulnCheck · Vendor: flexense

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

Am I affected?

Timeline

2026-01-16 00:16 UTCPublished CVE record published
2026-06-17 04:18 UTCUpdated Record last modified

flexense sync breeze DOWNGRADE

Affected: 13.6.18

Fixed in: no fixed release known

Safe to downgrade to: a release before 13.6.18

1. Check installed version

apt-cache policy sync-breeze || rpm -q sync-breeze || sync-breeze --version

2. No fixed release: DOWNGRADE to a release before 13.6.18 (Debian / Ubuntu)

apt-cache madison sync-breeze sudo apt install sync-breeze=<VERSION_BEFORE_13.6.18> sudo apt-mark hold sync-breeze

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

dnf --showduplicates list sync-breeze sudo dnf downgrade sync-breeze-<VERSION_BEFORE_13.6.18> sudo dnf versionlock add sync-breeze

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-2021-47807?

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

Is CVE-2021-47807 being exploited?

CVE-2021-47807 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-2021-47807 affect?

CVE-2021-47807 affects sync breeze. Severity is high (CVSS 7.8). Sync Breeze 13.6.18 contains an unquoted service path vulnerability in its Windows service configuration that allows local attackers to potentially execute arbitrary code. Attackers can exploit the unquoted path in service binaries located

How urgent is CVE-2021-47807?

Priority 36/100. High severity; Public exploit reference

Software pages

Windows vulnerabilities

References

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