CVE-2023-29363
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 · uneditedWindows Pragmatic General Multicast (PGM) 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 analysisData overflows a buffer allocated on the heap, corrupting neighbouring heap structures and allocator metadata that a patient attacker can groom into control of execution. It is subtler than a stack overflow but just as dangerous. The fix is validating lengths before every write and using safe allocators and bounded operations.
General guidance for the heap-based buffer overflow 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< 10.0.10240.19983< 10.0.14393.5989< 10.0.17763.4499< 10.0.19044.3086< 10.0.19045.3087< 10.0.22000.2057< 10.0.22621.1848all 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 · scoped10.0.10240.1998310.0.14393.598910.0.17763.4499
Minimum fixed builds: Windows 10 1507 (10.0.10240.19983), 1607 (10.0.14393.5989), 1809 (10.0.17763.4499), 21h2 (10.0.19044.3086), 22h2 (10.0.19045.3087); Windows 11 21h2 (10.0.22000.2057), 22h2 (10.0.22621.1848)
- Identify the current Windows version by running 'winver' or checking System Information
- Determine which Windows version branch you're on from the affected versions list
- Apply the appropriate Windows security update (KB502895-KB5028963 or later) from Windows Update, or manually download from Microsoft Update Catalog
- For Windows 10 1507: Upgrade to build 10.0.10240.19983 or later
- For Windows 10 1607: Upgrade to build 10.0.14393.5989 or later
- For Windows 10 1809: Upgrade to build 10.0.17763.4499 or later
- For Windows 10 21h2: Upgrade to build 10.0.19044.3086 or later
- For Windows 10 22h2: Upgrade to build 10.0.19045.3087 or later
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-2023-29363 — 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-2023-29363 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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