Information disclosure in QNAP Hybrid Backup Sync
CVE-2025-62840
A generation of error message containing sensitive information vulnerability has been reported to affect HBS 3 Hybrid Backup Sync. If an attacker gains local network access, they can then exploit the vulnerability to read application data. We have already fixed the vulnerability in the following version: HBS 3 Hybrid Backup Sync 26.2.0.938 and later
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.3 (Low). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.002 (15.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 15th percentile — 15.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
- QNAP Hybrid Backup Sync
- QNAP Systems Inc. Hbs 3 Hybrid Backup Sync — versions 26.1.x
Weakness classification (CWE)
References
- www.qnap.com/en/security-advisory/qsa-25-46 (Vendor Advisory)
Frequently asked questions
- What is CVE-2025-62840?
- CVE-2025-62840 is a low-severity vulnerability in QNAP Hybrid Backup Sync, classified under Generation of Error Message Containing Sensitive Information. CVSS score: 3.3/10. Published 2026-01-02.
- How severe is CVE-2025-62840?
- Low severity. CVSS v3 base score is 3.3 out of 10.