What is CVE-2025-62842?

CVE-2025-62842 is a high-severity vulnerability in QNAP Hybrid Backup Sync, classified under External Control of File Name or Path. CVSS score: 7.8/10. Published 2026-01-02.

How severe is CVE-2025-62842?

High severity. CVSS v3 base score is 7.8 out of 10.

Vulnerability in QNAP Hybrid Backup Sync

CVE-2025-62842

An external control of file name or path 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 or modify files or directories. We have already fixed the vulnerability in the following version: HBS 3 Hybrid Backup Sync 26.2.0.938 and later

EPSS: 0.003 (17.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Qnap Hybrid_backup_sync
Qnap Systems Inc. Hbs 3 Hybrid Backup Sync — versions 26.1.x

Weakness classification (CWE)

CWE-73 — External Control of File Name or Path

References

security@qnapsecurity.com.tw (Vendor Advisory)

Frequently asked questions

What is CVE-2025-62842?: CVE-2025-62842 is a high-severity vulnerability in QNAP Hybrid Backup Sync, classified under External Control of File Name or Path. CVSS score: 7.8/10. Published 2026-01-02.
How severe is CVE-2025-62842?: High severity. CVSS v3 base score is 7.8 out of 10.