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Windows 10 1809Operating system · Microsoft

CVE-2023-35644

HIGH · 7.8 CVSS v3.1 Published 2023-12-12
Fix available
A fix is available. Upgrade to 10.0.17763.5206 / 10.0.19041.3803 or later.
See remediation →
80/100
Remediation priority · High
Zero-click Patch available

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
Windows Sysmain Service Elevation of Privilege 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 analysis
How this class of weakness works · CWE-190

An arithmetic operation produces a value too large for its type and wraps around to an unexpected — often tiny or negative — number. That miscalculated value then drives a memory allocation or a bounds check, opening the door to corruption. The fix is checked arithmetic and validating sizes before they're used.

General guidance for the integer 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
Windows 10 1809Operating system
Affected:< 10.0.17763.5206
Windows 10 21h2Operating system
Affected:< 10.0.19041.3803
Windows 10 22h2Operating system
Affected:< 10.0.19045.3803
Windows 11 21h2Operating system
Affected:< 10.0.22000.2652
Windows 11 22h2Operating system
Affected:< 10.0.22621.2861
Windows 11 23h2Operating system
Affected:< 10.0.22631.2861
Windows Server 2019Operating system
Affected:all versions
Windows Server 2022Operating system
Affected:all versions

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
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/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 · scoped
Upgrade available Upgrade to 10.0.17763.5206 / 10.0.19041.3803 / 10.0.19045.3803 or later
Fixed in 10.0.17763.520610.0.19041.380310.0.19045.3803
Vendor patch msrc.microsoft.com →
Recommended fix High confidence

Apply December 2023 Security Updates: Windows 10 1809 -> 10.0.17763.5206, Windows 10 21h2 -> 10.0.19041.3803, Windows 10 22h2 -> 10.0.19045.3803, Windows 11 21h2 -> 10.0.22000.2652, Windows 11 22h2 -> 10.0.22621.2861, Windows 11 23h2 -> 10.0.22631.2861, Windows Server 2019/2022 -> latest available s

  1. Open Windows Settings and navigate to Update & Security > Windows Update
  2. Click 'Check for updates' to ensure you have the latest updates available
  3. Look for the security update containing CVE-2023-35644 (December 2023 Security Updates)
  4. Install the update and restart the system if required
  5. Alternatively, manually download the update from Microsoft Catalog: https://catalog.update.microsoft.com/ and search for CVE-2023-35644
  6. Verify the installation by checking the installed updates in Control Panel > Programs > Programs and Features > View installed updates
  7. Confirm the Sysmain service vulnerability is addressed by verifying the system build matches the fixed version for your Windows edition
Caveat Standard Windows security update - no expected breaking changes; as with any system update, test in staging environment before broad deployment

Generated from the published advisory — verify against the referenced sources before acting.

We can perform the upgrade in your staging environment and verify nothing breaks — typical engagement from $3,200. Get the upgrade done

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2023-35644 in production — separate from our analysis above.

No notes yet

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What this is

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.

What belongs here
  • 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
  • No spam, self-promotion, credentials, or personal data