CVE-2018-0956
A denial of service vulnerability exists in the HTTP 2.0 protocol stack (HTTP.sys) when HTTP.sys improperly parses specially crafted HTTP 2.0 requests, aka "HTTP.sys Denial of Service Vulnerability." This affects Windows Server 2016, Windows 10, Windows…
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 13.7%, higher than 96% of all known CVEs. Patch or mitigate before the next change window.
Description
A denial of service vulnerability exists in the HTTP 2.0 protocol stack (HTTP.sys) when HTTP.sys improperly parses specially crafted HTTP 2.0 requests, aka "HTTP.sys Denial of Service Vulnerability." This affects Windows Server 2016, Windows 10, Windows 10 Servers.
- CVSS 3.0
- 7.5 HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 13.69% probability · 96th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Affected
- microsoft/windows 10 · microsoft/windows server 2016
- Source
- secure@microsoft.com
EPSS moved from 12.4% on 21 September 2026 to 13.7% on 27 October 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.
References
- http://www.securityfocus.com/bid/103650Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1040661Third Party Advisory, VDB Entry
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-0956Patch, Vendor Advisory
- http://www.securityfocus.com/bid/103650Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1040661Third Party Advisory, VDB Entry
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-0956Patch, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.