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CVE-2025-62839

Hard-coded Cryptographic Key #1

Products / packages QNAP Systems Inc. HBS 3 Hybrid Backup Sync · QNAP Systems Inc. Hybrid Backup Sync

Published

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Severity and exploitation

Not in CISA KEV

KEV coverage does not rule out exploitation.

KEV checked 14/11/2026, 21:30:34 UTC
qnap · CVSS:4.0 · 8.7
Assessment vectorCVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Severity

high8.7

CVSS measures technical severity, not the likelihood of an attack.

Known exploitation

Not listed in the checked CISA KEV catalog

Absence from CISA KEV does not rule out attacks.

Public exploit

Not established by this record

Missing evidence does not mean no public exploit exists.

Remediation

Source guidance available

Review the recorded instructions. Guidance may be a workaround rather than a fixed version.

What this means

HBS 3 Hybrid Backup Sync and Hybrid Backup Sync have a hard-coded cryptographic key vulnerability, potentially allowing remote attackers to compromise system security, affecting versions before 26.4.0.521 and 26.4.1.563.

Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.

Attack conditions

No attack-condition excerpt has been identified here. Review the full source description and references for authentication, network access, and configuration requirements.

Review supporting sources →

Affected versions

Check the exact model, release, and any platform requirements against your installation.

QNAP Systems Inc. · qnap

HBS 3 Hybrid Backup Sync

1 range
qnap version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

26.4.x → before 26.4.0.521

custom versions

unaffected

unknown

Other versions: unaffected

QNAP Systems Inc. · qnap

Hybrid Backup Sync

2 ranges
qnap version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

26.4.x → before 26.4.0.521

custom versions

26.4.x → before 26.4.1.563

custom versions

unaffected

unknown

Other versions: unaffected

Automatic dependency matching is unavailable for this record. Use the product evidence and publisher’s instructions to check your installation.

What to do

Compare your installed product and version with the affected versions above. A matching product name alone does not confirm exposure.

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

qnap guidance ↗

cve.new guidance unless attributed to a publisher. This page does not inspect your installation.

Public exploit evidence

No public exploit reference is identified in the imported evidence. This is not a claim that no exploit exists.

Original source description

Read the full publisher description

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

References

2 sources
www.qnap.com/en/app-release-notes
Release notesqnap
www.qnap.com/en/app-release-notes
Release notesqnap

Inside the record

Evidence available

Package identity · not supplied
Version evidence
Remediation guidance
Weakness classification
Additional publishers

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2025-62839

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-321 ↗

CWE-321

qnap

Related →
Contributing organizations · 2
qnap

Assigning organization

2026-10-29
CISA-ADP

Additional data publisher

2026-10-29

Timeline

All times UTC

  1. Advisory published

    Publication date supplied by the source.

  2. Source updated

    Latest modification date supplied by the source.

  3. Last imported by cve.new

    Latest catalog import, not the date we first saw this advisory.

What changed

Follow changes
  1. CVE · CVE-2025-62839

    Observed 2026-10-29T14:27:52.450Z · upstream updated 2026-10-29T14:17:58.115Z

    Prioritization updated

    before

    []

    after

    [
  {
    "source": "CISA-ADP",
    "type": "SSVC",
    "role": "CISA Coordinator",
    "timestamp": "2026-10-29T14:17:33.034037Z",
    "decisions": [
      {
        "name": "Exploitation",
        "value": "none"
      },
      {
        "name": "Automatable",
        "value": "no"
      },
      {
        "name": "Technical Impact",
        "value": "total"
      }
    ]
  }
]

Large field values are marked as truncated previews. Original source snapshots remain retained.

Showing up to 50 most recent observed changes.