Integer overflow in Nbdkit Project
CVE-2025-47712
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.
Vulnerability class: Integer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.005 (38.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 39th percentile — 38.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.005 · change: +0.000
Affected products
- Nbdkit Project
- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 8 Advanced Virtualization
- Red Hat Enterprise Linux 9
- Red Hat In-Vehicle Operating System 1
- Red Hat Enterprise Linux — versions 7.0, 8.0, 9.0
- Red Hat Enterprise Linux Advanced Virtualization — versions 8.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- access.redhat.com/security/cve/CVE-2025-47712 (Third Party Advisory, vdb-entry)
- bugzilla.redhat.com/show_bug.cgi (issue-tracking, Third Party Advisory, Issue Tracking)
- lists.libguestfs.org/archives/list/guestfs@lists.libguestfs.org/thread/67E7AASH… (Third Party Advisory)
Frequently asked questions
- What is CVE-2025-47712?
- CVE-2025-47712 is a medium-severity vulnerability in Nbdkit Project, classified under Integer Overflow or Wraparound. CVSS score: 6.5/10. Published 2025-06-09.
- How severe is CVE-2025-47712?
- Medium severity. CVSS v3 base score is 6.5 out of 10.
- Is CVE-2025-47712 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.