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CVE-2025-66592An origin validation error vulnerability in Synology Active Backup for Business Agent before 3.1.0-4967 allows local users to write…
- 6.1MediumCVSS base score
- 0.09%Exploitation in 30 daysEPSS · top 100% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By synology
- 6 months later
· 6 months later
Published
- 6 days later
· 6 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| synologyCNA (assigner) | 3.1 | Medium6.1 | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H |
| NVDNVD · Analyzed | 3.1 | Medium5.6 | CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:H |
- EPSS (exploitation in 30 days)
- 0.09% · top 100% of all CVEs (15 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.1.
Affected products
Synology · Synology Active Backup for Business Agent
- affected < 3.1.0-4967
References
References1
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2025-209962 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2025-66592)Record last updated .