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Vulnerabilities

Vulnerability · CVE-2025-47712

A flaw exists in the nbdkit "blocksize" filter that can be triggered by a specific type of client request.

Published Jun 9, 2025 · catalog updated Jun 30, 2026 · A flaw exists in

Check if you run it

No confirmed exploitation is on record for CVE-2025-47712. EPSS is 0.49%. Act only if a listed version of A flaw exists in is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (A flaw exists in).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium6.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.49%
Remediation
Advisory link
Affected products
vendor redhat

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor redhatversion unspecified

How to fix CVE-2025-47712

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-47712. EPSS is 0.49%. Act only if a listed version of A flaw exists in is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.49%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Jun 9, 2025 · EUVD

    Detected

    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.

  2. Jun 30, 2026 · EUVD

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2025-47712

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-47712

    30-day exploitation probability 0.5%

    first.org
  • EUVDVulnerability recordEUVD-2025-17436

    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 ser

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.