Security readout for executives and security teams
Plain-English summary
CVE-2025-47711 is a medium-severity availability issue in nbdkit. A low-privileged network client can trigger a server-side internal error through a specially shaped large block-status request and plugin response. The sources report denial of service, not data theft or data modification.
Executive priority
Treat this as a targeted availability risk, not a breach indicator. Patch or mitigate exposed nbdkit services in normal vulnerability cycles, accelerating for production storage, virtualization, or tenant-facing environments where service interruption has business impact.
Technical view
The flaw is a CWE-193 off-by-one error in nbdkit server handling of plugin block-status responses. If a client requests a very large range and a plugin returns an even larger single block, nbdkit may hit a critical internal error. CVSS is 6.5: network reachable, low privileges, no user interaction, high availability impact.
Likely exposure
Most relevant exposure is Red Hat systems using nbdkit, especially RHEL 9 and RHEL 10, which the bundle marks affected. RHEL 7 and RHEL 8 entries are listed as unknown. Internet- or tenant-reachable nbdkit services carry higher operational risk.
Exploitation context
The bundle does not cite active exploitation, and KEV is false. Exploitation requires network access and low privileges. The documented impact is service disruption when specific large block-status behavior is reached; no public source here supports confidentiality or integrity compromise.
Researcher notes
Evidence supports a denial-of-service condition caused by block-status response handling. The source bundle names the vulnerability pattern and Red Hat affected products, but does not provide exploit proof, fixed versions, or complete status for RHEL 7 and RHEL 8.
Mitigation direction
- Check Red Hat advisory status for affected nbdkit packages.
- Apply vendor-provided updates when available for your platform.
- Restrict nbdkit access to trusted clients and networks.
- Prioritize exposed or multi-tenant nbdkit deployments.
- Monitor nbdkit crashes or repeated internal error events.
Validation and detection
- Inventory systems with nbdkit installed or enabled.
- Identify RHEL 9 and RHEL 10 deployments using nbdkit.
- Review nbdkit service exposure and client trust boundaries.
- Check package versions against current Red Hat guidance.
- Confirm logs show no recurring block-status related crashes.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-193: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2025-47711 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H2.83.6redhatVulnerability scoring details
Base CVSS 3.1 score
6.5MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- Source timelineredhat
Made public.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- Source timelineredhat
Reported to Red Hat.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://access.redhat.com/security/cve/CVE-2025-47711CVE reference, redhat · vdb-entry, x_refsource_REDHAT
- RHBZ#2365687CVE reference, redhat · issue-tracking, x_refsource_REDHAT
- https://lists.libguestfs.org/archives/list/guestfs@lists.libguestfs.org/thread/67E7AASHHADIY7VAD3FFW2I67LTWVWYF/CVE reference, redhat
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Off-by-one Error
Off-by-one Error represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.