QNAP HBS 3 Hybrid Backup Sync 25.1.1.673/25.1.4.952 information exposure

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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2.8$0-$5k0.00

Summaryinfo

A vulnerability categorized as problematic has been discovered in QNAP HBS 3 Hybrid Backup Sync. This affects an unknown function. Executing a manipulation can lead to information exposure. The identification of this vulnerability is CVE-2025-62840. The physical device can be targeted for the attack. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in QNAP HBS 3 Hybrid Backup Sync. It has been declared as problematic. This vulnerability affects an unknown functionality. The manipulation with an unknown input leads to a information exposure vulnerability. The CWE definition for the vulnerability is CWE-209. The product generates an error message that includes sensitive information about its environment, users, or associated data. As an impact it is known to affect confidentiality. CVE summarizes:

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

The weakness was shared with Pwn2Own 2025 as qsa-25-46. The advisory is shared for download at qnap.com. This vulnerability was named CVE-2025-62840 since 10/24/2025. The exploitation appears to be easy. The attack needs to be approached locally. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1592.

Upgrading to version 26.2.0.938 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-0663). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 2.8
VulDB Meta Temp Score: 2.8

VulDB Base Score: 2.4
VulDB Temp Score: 2.3
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 3.3
NVD Vector: 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Information exposure
CWE: CWE-209 / CWE-200 / CWE-284
CAPEC: 🔒
ATT&CK: 🔒

Physical: Yes
Local: Yes
Remote: No

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: HBS 3 Hybrid Backup Sync 26.2.0.938

Timelineinfo

10/24/2025 CVE reserved
01/02/2026 +70 days Advisory disclosed
01/02/2026 +0 days VulDB entry created
02/06/2026 +35 days VulDB entry last update

Sourcesinfo

Vendor: qnap.com

Advisory: qsa-25-46
Organization: Pwn2Own 2025
Status: Confirmed

CVE: CVE-2025-62840 (🔒)
GCVE (CVE): GCVE-0-2025-62840
GCVE (VulDB): GCVE-100-339424
EUVD: 🔒

Entryinfo

Created: 01/02/2026 17:19
Updated: 02/06/2026 08:12
Changes: 01/02/2026 17:19 (68), 02/05/2026 20:56 (11), 02/06/2026 08:12 (1)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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