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CVE-2021-47807

8.5
High
EPSS 0.23%Jan 16, 2026

LPE via unquoted Windows service path in Sync Breeze 13.6.18

common questions

Is CVE-2021-47807 being exploited?

Not confirmed. CVE-2021-47807 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.23% probability of exploitation in the next 30 days.

How severe is CVE-2021-47807?

CVE-2021-47807 is rated High with a CVSS score of 8.5. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.

Is there a patch for CVE-2021-47807?

Not known from our data. No patch reference has been recorded for CVE-2021-47807, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.

What does CVE-2021-47807 affect?

CVE-2021-47807 affects Sync Breeze 13.6.18 on Windows. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.

What should I do about CVE-2021-47807?

Upgrade to fixed version when available; monitor vendor advisories

Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.

executive summary
technical analysis
affected
Sync Breeze 13.6.18 on Windows
impact

Local code execution and privilege escalation via unquoted service path in Program Files.

action required

Patch when possible

affected versions
Syncbreeze Sync Breeze
  • affected13.6.18

As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.

how to fix
Remediation steps are tailored for users whose stack is affected. Add this technology to your stack to see the fix checklist.
references
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