CVE-2023-21687
HTTP.sys Information Disclosure Vulnerability
MEDIUM
5.5
CVSS Score
Published: February 14, 2023 at 07:33 PM UTC
Updated: August 19, 2026 at 05:18 PM UTC
3 products affected across 1 vendorWindows Server 2022Windows 11 22H2Windows 11 21H2
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Severity
MEDIUM5.5
Exploit prediction
EPSS 0.5%
SSVC
No known exploit
Description
HTTP.sys Information Disclosure Vulnerability
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
Affected range stops below 10.0.22000.1574, so it looks safe — our inference, not a vendor statement
Affected range stops below 10.0.22621.1574, so it looks safe — our inference, not a vendor statement
Affected range stops below 10.0.22621.1265, so it looks safe — our inference, not a vendor statement
10.0.20348.0 ≤ v < 10.0.20348.154710.0.20348.0
Affected range stops below 10.0.20348.1547, so it looks safe — our inference, not a vendor statement
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
References (1)
Vendor AdvisoryPatch
Source: [email protected]
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21687SSVC — Action Prioritization
SSVCNo known exploitNot automatablePartial impact
SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.
CVSS
5.5MEDIUMmicrosoft
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-125CWE-668
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