CVE-2025-27463
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · unedited[This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] The Windows PV drivers expose various facilities to userspace. Several of these have no security descriptor, and are therefore fully accessible to unprivileged users. These are: 1. XenCons, CVE-2025-27462 2. XenIface, CVE-2025-27463 3. XenBus, CVE-2025-27464
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceWindows PV (paravirtualization) drivers expose the XenIface facility to userspace without a security descriptor, making it fully accessible to unprivileged users. This allows any local user to interact with the paravirtualization interface that should be restricted to privileged operations.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Local
- Complexity
- Low
- Privileges
- None
- Authentication
- X
- User interaction
- None
- Scope
- X
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Check if Xen PV drivers are installedLook for Xen-related drivers or services on the system. Check Device Manager for drivers with 'xen' prefix, or run 'sc query' to list services and search for Xen-related entries.Affected if Xen paravirtualization drivers (xen*) are present on the system
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Verify XenIface driver presenceCheck for the presence of the XenIface driver. This can be done by checking for 'XenIface' in the list of loaded drivers or by checking the Windows registry under HKLM\SYSTEM\CurrentControlSet\Services\XenIface.Affected if The XenIface driver service exists on the system
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Inspect XenIface device object securityUse the Windows security descriptor checker (sdcheck) or icacls on the XenIface device path (typically \\??\XenIface or \Device\XenIface) to view the security descriptor. Run 'icacls \\??\XenIface' or use a tool like WinObj to examine the device object's permissions.Affected if The security descriptor allows unrestricted access to unprivileged users (SIDs like Everyone, Users, or Authenticated Users have excessive permissions)
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Test unprivileged access to XenIfaceAttempt to open or communicate with the XenIface facility from an unprivileged user account or process. This can be done by running a command or script under a standard user context that tries to access the XenIface interface.Affected if Unprivileged (non-admin) users can successfully open handles or send IOCTLs to the XenIface interface
A system is affected if Xen PV drivers with the XenIface facility are installed and the interface grants unprivileged users access to paravirtualization operations that should be restricted.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataApply the vendor patch when available to add proper security descriptors to the XenIface facility, restricting access to privileged users/processes only.
- Consultation2.0 h
- Implementation8.0 h
- Testing4.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $4,480.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-27463 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2025-27463 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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