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Fencer Vulns
high 7.5

CVE-2025-53805 json

HTTP.sys Denial of Service Vulnerability

published 2025-09-09 13 mo ago modified 2026-06-17 4 mo ago also EUVD-2025-27325

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.5%
EPSS 1.5% chance of exploitation in 30 days, percentile 74%
public exploits
0
none known

Summary

Out-of-bounds read in Windows Internet Information Services allows an unauthorized attacker to deny service over a network.

Patch / fix

  • Microsoft Windows 11 version 22H2 10.0.22621.5909
  • Microsoft Windows 11 version 22H3 10.0.22631.5909
  • Microsoft Windows 11 Version 23H2 10.0.22631.5909
  • Microsoft Windows 11 Version 24H2 10.0.26100.6584
  • Microsoft Windows Server 2022 10.0.20348.4171
  • Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.1849
  • Microsoft Windows Server 2025 10.0.26100.6584
  • Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.6584

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
13 mo ago

Exploit prediction

1.51% chance of exploitation in the next 30 days, higher than 74% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 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
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Microsoft Windows 11 version 22H2
  • Microsoft Windows 11 version 22H3
  • Microsoft Windows 11 Version 23H2
  • Microsoft Windows 11 Version 24H2
  • Microsoft Windows Server 2022
  • Microsoft Windows Server 2022, 23H2 Edition (Server Core installation)
  • Microsoft Windows Server 2025
  • Microsoft Windows Server 2025 (Server Core installation)

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.