Read the docs
TI-2025-43984 Aliases CVE-2025-62841GHSA-rv3x-2h7v-368w

Hard-coded cryptographic key in QNAP Hybrid Backup Sync

Priority LOW 39CWE-321Published · Updated

Key facts

Attack vector
Adjacent network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-321.

Summary

QNAP HBS 3 Hybrid Backup Sync from 26.4.x before 26.4.0.521 and Hybrid Backup Sync from 26.4.x before 26.4.0.521 or before 26.4.1.563 are affected. The product uses a hard-coded cryptographic key (CWE-321). An attacker on an adjacent network, without privileges or user interaction, can compromise the security of the system, with high impact to confidentiality, integrity and availability.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

An use of hard-coded cryptographic key vulnerability has been reported to affect HBS 3 Hybrid Backup Sync and Hybrid Backup Sync. If exploited, the vulnerability could allow remote attackers to compromise the security of the system. We have already fixed the vulnerability in the following version: HBS 3 Hybrid Backup Sync 26.4.0.521 and later Hybrid Backup Sync 26.4.0.521 and later Hybrid Backup Sync 26.4.1.563 and later

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00245 15th percentileScored 2026-11-07
Fix Fixed HBS 3 Hybrid Backup Sync (QNAP Systems Inc.): 26.4.0.521Hybrid Backup Sync (QNAP Systems Inc.): 26.4.0.521, 26.4.1.563

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
QNAPHBS 3 Hybrid Backup Sync26.4.x to before 26.4.0.52126.4.0.521Patch availableCNA
QNAPHybrid Backup Sync26.4.x to before 26.4.0.521; 26.4.x to before 26.4.1.56326.4.0.521, 26.4.1.563Patch availableCNA
  • HBS 3 Hybrid Backup Sync VendorQNAP Affected 26.4.x to before 26.4.0.521 Fixed in 26.4.0.521 Patch available CNA
  • Hybrid Backup Sync VendorQNAP Affected 26.4.x to before 26.4.0.521; 26.4.x to before 26.4.1.563 Fixed in 26.4.0.521, 26.4.1.563 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:qnap:hybrid_backup_sync:*:*:*:*:*:*:*:*——QNAP
  • cpe:2.3:a:qnap:hybrid_backup_sync:*:*:*:*:*:*:*:* Versions — — ·QNAP

Remediation

Update HBS 3 Hybrid Backup Sync to 26.4.0.521 or later. Update Hybrid Backup Sync to 26.4.0.521 or later, or to 26.4.1.563 or later.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

  • Fix · CNA HBS 3 Hybrid Backup Sync (QNAP Systems Inc.) Fixed in 26.4.0.521
  • Fix · CNA Hybrid Backup Sync (QNAP Systems Inc.) Fixed in 26.4.0.521, 26.4.1.563

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    QNAP Systems HBS 3 Hybrid Backup Sync, Hybrid Backup Sync 26.4.0.521, 26.4.1.563

    2 records Highest priority Priority LOW 2 LOW

    Other records, highest priority first

    • TI-2025-43983 Hard-coded cryptographic key in QNAP Hybrid Backup SyncPriority LOW 39
    Show all 2 records →

Timeline

  1. 2026-10-29 Threatist record created from CVE-2025-62841
  2. 2026-10-29 Alias added: GHSA-rv3x-2h7v-368w
  3. 2026-10-29 CISA SSVC decision points changed
  4. 2026-10-29 Priority changed: MEDIUM → LOW

References

Other 2

  • TI-2022-10581 DeadBolt Ransomware KEVCVSS 3.1CRITICAL 10.0
  • TI-2021-09791 Improper Authorization Vulnerability in HBS 3 (Hybrid Backup Sync) KEVCVSS 3.1CRITICAL 10.0
  • TI-2020-02221 Command Injection Vulnerability in QTS and QuTS hero KEVCVSS 3.1CRITICAL 9.8
  • TI-2019-05103 Path traversal in QNAP NAS devices running Photo Station KEVCVSS 3.1CRITICAL 9.8
  • TI-2019-05102 Path traversal in QNAP NAS devices running Photo Station KEVCVSS 3.1CRITICAL 9.8
  • TI-2019-05101 Improper input validation in QNAP NAS devices KEVCVSS 3.1CRITICAL 9.8
See all 681 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences