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CVE-2025-47711— Nbdkit: nbdkit-server: off-by-one error when processing block status may lead to a denial of service

Quick assessment

Affected
CVE-2025-47711
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Libguestfs nbdkit是Libguestfs社区的一个用于创建NBD（访问网络块设备的协议）服务端的应用软件。 Libguestfs nbdkit存在安全漏洞，该漏洞源于处理插件响应时存在内部错误，可能导致拒绝服务攻击。

CVSS 6.5 · Medium EPSS 0.40% · P33

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 9

VendorProduct Version RangeStatus
None None 1.11.10< 1.38.6 affected
1.40.0< 1.40.6 affected
1.42.0< 1.42.3 affected
Red Hat Red Hat Enterprise Linux 10 any affected
Red Hat Red Hat Enterprise Linux 7 any unknown
Red Hat Red Hat Enterprise Linux 8 any unknown
Red Hat Red Hat Enterprise Linux 8 Advanced Virtualization any unknown
any unknown
Red Hat Red Hat Enterprise Linux 9 any affected

I. Basic Information for CVE-2025-47711

Vulnerability Information
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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Nbdkit: nbdkit-server: off-by-one error when processing block status may lead to a denial of service
Source: CVE Program / CVE List V5
Vulnerability Description
There's a flaw in the nbdkit server when handling responses from its plugins regarding the status of data blocks. If a client makes a specific request for a very large data range, and a plugin responds with an even larger single block, the nbdkit server can encounter a critical internal error, leading to a denial-of-service.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
Off-by-one错误
Source: CVE Program / CVE List V5
Vulnerability Title
Libguestfs nbdkit 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Libguestfs nbdkit是Libguestfs社区的一个用于创建NBD（访问网络块设备的协议）服务端的应用软件。 Libguestfs nbdkit存在安全漏洞，该漏洞源于处理插件响应时存在内部错误，可能导致拒绝服务攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
- - 1.11.10 ~ 1.38.6 -
Red Hat Red Hat Enterprise Linux 10 - cpe:/o:redhat:enterprise_linux:10
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 8 Advanced Virtualization - cpe:/a:redhat:advanced_virtualization:8::el8
Red Hat Red Hat Enterprise Linux 8 Advanced Virtualization - cpe:/a:redhat:advanced_virtualization:8::el8
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9

II. Public POCs for CVE-2025-47711

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III. Intelligence Information for CVE-2025-47711

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Mailing List Discussions for CVE-2025-47711 (1)

IV. Related Vulnerabilities

Same weakness: CWE-193

V. Comments for CVE-2025-47711

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