VDB-308580 · CVE-2025-47712 · EUVD-2025-17436

nbd nbdkit Blocksize Filter denial of service

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.5	$0-$5k	0.00

Summaryinfo

A vulnerability was found in nbd nbdkit. It has been declared as problematic. This affects an unknown function of the component Blocksize Filter. The manipulation results in denial of service. This vulnerability is known as CVE-2025-47712. No exploit is available.

Detailsinfo

A vulnerability was found in nbd nbdkit (version now known). It has been classified as problematic. Affected is some unknown processing of the component Blocksize Filter. The manipulation with an unknown input leads to a denial of service vulnerability. CWE is classifying the issue as CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. This is going to have an impact on availability. CVE summarizes:

A flaw exists in the nbdkit "blocksize" filter that can be triggered by a specific type of client request. When a client requests block status information for a very large data range, exceeding a certain limit, it causes an internal error in the nbdkit, leading to a denial of service.

The advisory is shared for download at bugzilla.redhat.com. This vulnerability is traded as CVE-2025-47712 since 05/07/2025. There are neither technical details nor an exploit publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 240796 (SUSE SLES15 / openSUSE 15 Security Update : nbdkit (SUSE-SU-2025:01889-1)), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Tenable (240796) and EUVD (EUVD-2025-17436). Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

Name

nbdkit

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 5.5

VulDB Base Score: 3.5
VulDB Temp Score: 3.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.5
NVD Vector: 🔍

CNA Base Score: 6.5
CNA Vector: 🔍

CVSSv2info

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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Denial of service
CWE: CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 240796
Nessus Name: SUSE SLES15 / openSUSE 15 Security Update : nbdkit (SUSE-SU-2025:01889-1)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

05/07/2025 🔍
05/13/2025 +6 days 🔍
05/13/2025 +0 days 🔍
01/08/2026 +240 days 🔍

Sourcesinfo

Advisory: bugzilla.redhat.com
Status: Not defined

CVE: CVE-2025-47712 (🔍)
GCVE (CVE): GCVE-0-2025-47712
GCVE (VulDB): GCVE-100-308580
EUVD: 🔍

Entryinfo

Created: 05/13/2025 08:04
Updated: 01/08/2026 05:38
Changes: 05/13/2025 08:04 (50), 06/09/2025 09:07 (12), 06/09/2025 10:54 (1), 06/28/2025 02:29 (2), 07/29/2025 21:24 (1), 08/21/2025 04:47 (11), 01/08/2026 05:38 (4)
Complete: 🔍
Cache ID: 216::103