PatchTheCVECVE-2025-66592: An origin validation error vulnerability in Synology Active Backup for Business Agent before 3.1.0-4967 allows
CVE-2025-66592 is a medium-severity flaw (CVSS 6.1) affecting active backup for business agent. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
An origin validation error vulnerability in Synology Active Backup for Business Agent before 3.1.0-4967 allows local users to write arbitrary files with restricted content and conduct denial-of-service during installation.
Why this priority
- No elevated risk signals yet
A fixed release or distro patch exists.
Risk facts
| CVSS score | 6.1 (Medium) |
| Attack vector | Local |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | Required |
| EPSS exploit chance | 0.1% (top 100%) |
| CISA exploited list | No |
| Weakness | CWE-346 |
| Published | 2026-05-27 |
| Last modified | 2026-10-07 |
Last updated 2026-10-07 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
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-2025-66592?
active backup for business agent: upgrade to 3.1.0-4967. Exact commands for each OS are on this page.
Is CVE-2025-66592 being exploited?
CVE-2025-66592 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-2025-66592 affect?
CVE-2025-66592 affects active backup for business agent. Severity is medium (CVSS 6.1). An origin validation error vulnerability in Synology Active Backup for Business Agent before 3.1.0-4967 allows local users to write arbitrary files with restricted content and conduct denial-of-service during installation.
How urgent is CVE-2025-66592?
Priority 21/100. No elevated risk signals yet.