CVE-2026-33096: HTTP.sys Denial of Service Vulnerability
Advisory generated from the CVE record, CISA, Exploit Observer and VEDAS: what it is, whether it is exploited, who is affected, and how to fix and detect it.
Generated by VEDAS. Scores as of 2026-11-04 15:41 UTC. Rebuilt every few hours from cve-scores, CISA KEV and vedas-signatures. How this works and its limits.
What it is
Out-of-bounds read in Windows HTTP.sys allows an unauthorized attacker to deny service over a network.
Description quoted from the CVE record (assigned by microsoft, published 2026-04-14).
Weakness: CWE-125: Out-of-bounds Read
How it can be exploited
Exploitable over the network with low attack complexity needing no privileges and no user interaction. Impact: confidentiality none, integrity none, availability high. CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C
CISA assessment (SSVC): CISA has no evidence of exploitation. Automatable: yes. Technical impact: partial.
Public exploit evidence (Exploit Observer)
Exploit Observer has no public exploit code naming this CVE. Check Exploit Observer for anything new.
Live scores
- EPSS
- 0.012
some chance of attack soon - VEDAS
- 0.049
little exploit evidence - On CISA KEV
- Not listed
- Detection rule
- None yet
Who is affected
| Product | Affected | Not affected |
|---|---|---|
| Microsoft Windows 11 version 23H2 | from 10.0.22631.0 before 10.0.22631.6936 | Not stated |
| Microsoft Windows 11 Version 23H2 | from 10.0.22631.0 before 10.0.22631.6936 | Not stated |
| Microsoft Windows 11 Version 24H2 | from 10.0.26100.0 before 10.0.26100.8246 | Not stated |
| Microsoft Windows 11 Version 25H2 | from 10.0.26200.0 before 10.0.26200.8246 | Not stated |
| Microsoft Windows 11 version 26H1 | from 10.0.28000.0 before 10.0.28000.1836 | Not stated |
| Microsoft Windows Server 2022 | from 10.0.20348.0 before 10.0.20348.5020 | Not stated |
| Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) | from 10.0.25398.0 before 10.0.25398.2274 | Not stated |
| Microsoft Windows Server 2025 | from 10.0.26100.0 before 10.0.26100.32690 | Not stated |
| Microsoft Windows Server 2025 (Server Core installation) | from 10.0.26100.0 before 10.0.26100.32690 | Not stated |
Version ranges exactly as the CVE record states them. “Before X” means X is the first fixed version.
How to fix it
Fixed versions stated in the CVE record: 10.0.22631.6936, 10.0.26100.8246, 10.0.26200.8246, 10.0.28000.1836, 10.0.20348.5020, 10.0.25398.2274, 10.0.26100.32690.
Vendor guidance:
- HTTP.sys Denial of Service Vulnerability (vendor-advisory, patch)
How to detect it
There is no open VEDAS detection rule for this bug yet. It is listed on the detection gaps page if CISA has confirmed attacks.
Advisories on this CVE
- Anthropic AI model chained flaws into Chrome, Safari, Android, Windows and Linux exploits (full advisory)
References
Vendor advisories and patches
- HTTP.sys Denial of Service Vulnerability (vendor-advisory, patch)
Other databases
Where this comes from
This advisory is generated automatically by VEDAS from: CVE.org record, cve-scores (EPSS and VEDAS), Exploit Observer. Text in quotes is reproduced from the source; everything else is a fixed template filled with source fields. Nothing here is written by a language model. Check the vendor advisory before acting, and read how VEDAS and Exploit Observer work, and their limits.
Supporting partners
