How severe is CVE-2025-62840?

CVE-2025-62840 has a CVSS 3.x base score of 3.3, rated low severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2025-62840 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-62840?

CVE-2025-62840 affects Qnap Hybrid Backup Sync. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-62840?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-62840 have an EU (EUVD) identifier?

Yes. CVE-2025-62840 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-0663.

When was CVE-2025-62840 published?

CVE-2025-62840 was published on 2026-01-02 and last updated on 2026-06-17.

CVE-2025-62840

CVE-2025-62840 is a low-severity vulnerability in Qnap Hybrid Backup Sync with a CVSS 3.x base score of 3.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-209.

Key facts

Severity: Low (CVSS 3.x base score 3.3)
CVSS v4: 7.0
EPSS exploit prediction: 0% (10th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-0663
Weakness: CWE-209
Affected product: Qnap Hybrid Backup Sync
Published: 2026-01-02
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is 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
How severe is CVE-2025-62840?: CVE-2025-62840 has a CVSS 3.x base score of 3.3, rated low severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2025-62840 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-62840?: CVE-2025-62840 affects Qnap Hybrid Backup Sync. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-62840?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-62840 have an EU (EUVD) identifier?: Yes. CVE-2025-62840 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-0663.
When was CVE-2025-62840 published?: CVE-2025-62840 was published on 2026-01-02 and last updated on 2026-06-17.

References

https://www.qnap.com/en/security-advisory/qsa-25-46

Affected products (1)

cpe:2.3:a:qnap:hybrid_backup_sync:*:*:*:*:*:*:*:*

More vulnerabilities in Qnap Hybrid Backup Sync

CVE-2021-28799 — Critical (CVSS 10.0): An improper authorization vulnerability has been reported to affect QNAP NAS running HBS 3 (Hybrid Backup Sync. ) If…
CVE-2024-50388 — Critical (CVSS 9.8): An OS command injection vulnerability has been reported to affect HBS 3 Hybrid Backup Sync. If exploited, the…
CVE-2021-28809 — Critical (CVSS 9.8): An improper access control vulnerability has been reported to affect certain legacy versions of HBS 3. If exploited,…
CVE-2024-53695 — Critical (CVSS 9.1): A buffer overflow vulnerability has been reported to affect HBS 3 Hybrid Backup Sync. If exploited, the vulnerability…
CVE-2025-62842 — High (CVSS 7.8): An external control of file name or path vulnerability has been reported to affect HBS 3 Hybrid Backup Sync. If an…

All CVEs affecting Qnap Hybrid Backup Sync →

Other CWE-209 (Generation of Error Message Containing Sensitive Information) vulnerabilities

CVE-2025-62168 — Critical (CVSS 10.0): Squid is a caching proxy for the Web. In Squid versions prior to 7.2, a failure to redact HTTP authentication…
CVE-2025-68110 — Critical (CVSS 9.9): ChurchCRM is an open-source church management system. Versions prior to 6.5.3 may disclose database information in an…
CVE-2025-46658 — Critical (CVSS 9.8): An issue was discovered in ExonautWeb in 4C Strategies Exonaut 21.6. There are verbose error messages.
CVE-2024-28285 — Critical (CVSS 9.8): A Fault Injection vulnerability in the SymmetricDecrypt function in cryptopp/elgamal.h of Cryptopp Crypto++ 8.9, allows…
CVE-2023-40767 — Critical (CVSS 9.8): User enumeration is found in in PHPJabbers Make an Offer Widget v1.0. This issue occurs during password recovery, where…
CVE-2023-40766 — Critical (CVSS 9.8): User enumeration is found in in PHPJabbers Ticket Support Script v3.2. This issue occurs during password recovery,…

Browse all CWE-209 (Generation of Error Message Containing Sensitive Information) vulnerabilities →