CVE-2023-21554
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 · uneditedMicrosoft Message Queuing (MSMQ) Remote Code Execution Vulnerability
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 analysisThe application accepts input without confirming it is well-formed or within expected bounds, so malformed data can push the program into states its author never anticipated. Attackers probe these gaps to trigger crashes, bypass logic, or feed tainted values into more dangerous operations downstream. Remediating it well means validating and normalising every input at the boundary against a strict allow-list — not merely filtering known-bad values.
General guidance for the improper input validation class — the official description and references above are authoritative for this specific CVE. Want a bespoke review and a reviewed fix? Ask our team →
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 data< 10.0.14393.5850< 10.0.17763.4252< 10.0.19042.2846< 10.0.19044.2846< 10.0.19045.2846< 10.0.22000.1817< 10.0.22621.1555all versions= r2CVSS 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
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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.
dbcve · scoped10.0.14393.585010.0.17763.425210.0.19042.2846
Windows 10 1607: 10.0.14393.5850 or later | Windows 10 1809: 10.0.17763.4252 or later | Windows 10 20h2: 10.0.19042.2846 or later | Windows 10 21h2: 10.0.19044.2846 or later | Windows 10 22h2: 10.0.19045.2846 or later | Windows 11 21h2: 10.0.22000.1817 or later | Windows 11 22h2: 10.0.22621.1555 or
- Check current Windows version by running 'winver' or 'systeminfo' in Command Prompt
- Identify if MSMQ (Microsoft Message Queuing) component is installed by checking 'Programs and Features' > 'Turn Windows features on or off' for 'Microsoft Message Queue (MSMQ) Server'
- Apply the appropriate Microsoft security update from https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21554 based on your Windows version
- Restart the system after applying the security update
- Verify the patch was applied by checking Windows Update history for the KB corresponding to CVE-2023-21554
Generated from the published advisory — verify against the referenced sources before acting.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-21554 — 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-2023-21554 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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