CVE-2018-8225
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 · uneditedA remote code execution vulnerability exists in Windows Domain Name System (DNS) DNSAPI.dll when it fails to properly handle DNS responses, aka "Windows DNSAPI Remote Code Execution Vulnerability." This affects Windows 7, Windows Server 2012 R2, Windows RT 8.1, Windows Server 2008, Windows Server 2012, Windows 8.1, Windows Server 2016, Windows Server 2008 R2, Windows 10, Windows 10 Servers.
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 · high confidenceA remote code execution vulnerability exists in Windows DNSAPI.dll when it fails to properly handle DNS responses. An attacker can send specially crafted malicious DNS responses to trigger this vulnerability and execute arbitrary code on the affected system.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE dataall versions= 1607= 1703= 1709= 1803all versionsall versionsall versions= r2all versions= r2all versions= 1709= 1803CVSS 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
- Network
- Complexity
- High
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
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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Identify Windows versionRun 'winver' or 'systeminfo | findstr /B /C:"OS Name" /C:"OS Version"' to determine the installed Windows version and build numberAffected if The version matches any of: Windows 10 (all versions, 1607, 1703, 1709, 1803); Windows 7 (all versions); Windows 8.1 (all versions); Windows Server 2008 (all versions, R2); Windows Server 2012 (all versions, R2); Windows Server 2016 (all versions, 1709, 1803)
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Check DNSAPI.dll file versionNavigate to C:\Windows\System32\DNSAPI.dll, right-click and select Properties, or run 'dir C:\Windows\System32\DNSAPI.dll' to view version informationAffected if The DNSAPI.dll version is present on a system that matches the affected Windows versions listed above (specific patch KB numbers are not provided in this CVE data)
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Verify DNS Client service statusOpen Services (services.msc), locate 'DNS Client' service, or run 'sc query dnscache' from an elevated command promptAffected if The DNS Client service is running - this service processes DNS responses and is the attack vector for this vulnerability
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Determine if system is a DNS serverCheck if the DNS Server service is installed: run 'sc query DNS' or check Server Manager > Add Roles and Features > Server Roles for DNS ServerAffected if The system is configured as a DNS server - these systems are prioritized targets since they process external DNS queries directly
A system is affected if it runs any of the vulnerable Windows versions listed AND has the DNS Client service enabled, with DNS servers at highest risk due to direct exposure to external DNS responses.
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 Microsoft security updates for CVE-2018-8225 to all affected Windows systems. Prioritize DNS servers and systems with exposed DNS services.
- Consultation4.0 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 $5,120.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2018-8225 — 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-2018-8225 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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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- 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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