Skip to content
Noroxi
NVD / CVE Program· CNA microsoft

CVE-2026-20929: Windows HTTP.sys Elevation of Privilege Vulnerability

Noroxi assessment

Priority: Plan (action score 40/100)

  • A ready-made attack module is public (Metasploit); exploiting it takes no special expertise.
  • Because a ready-made attack tool exists, priority is at least “Plan”.
  • Probability of exploitation in the next 30 days: 2.8% (FIRST EPSS); higher than 86.8% of all records.
  • Anyone who can reach it over the internet can trigger it. A low-privileged account is enough. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: Windows 10 Version 1607 for 32-bit Systems 10.0.14393.8783; Windows 10 Version 1607 for x64-based Systems 10.0.14393.8783; Windows 10 Version 1809 for 32-bit Systems 10.0.17763.8276.

Add it to your regular patch cycle. Upgrade to Windows 10 Version 1607 for 32-bit Systems 10.0.14393.8783; Windows 10 Version 1607 for x64-based Systems 10.0.14393.8783; Windows 10 Version 1809 for 32-bit Systems 10.0.17763.8276 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Improper access control in Windows HTTP.sys allows an authorized attacker to elevate privileges over a network.

HighCVSS 7.5 · v3.1—Weaponized Fix available
Published
Jan 13, 2026
Updated
Jul 30, 2026
EPSS
2.8% · 86th percentile

Report tools

JSON

Action score

40

Plan

Add it to your regular patch cycle.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 2.8%
Ready-made attack tool
9 / 40 · floor: at least 40

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · microsoft
7.5
NVD has not scored this yet; the score shown is the CNA’s.

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • Weaponized exploit exists
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-20929

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits instantly.

Your free account also gets you

Running WordPress? Scan your site free with WP Lens

  • Stack alerts: add the products and versions you run, get the new CVEs that affect them
  • Uptime monitoring: 1 site, instant email when it goes down
  • Add your domain: subdomains and takeover risk scanned every week (1 domain)
  • 10 scans an hour on the security tools (3 a day without an account), an API key and MCP
  • All your scans in one panel: findings, what changed in the last scan, a report per domain or per client (PDF, share link)
All free tools

Sign up with email · Have an account? Sign in

Free account, no card. Unfollow any time.

Don't want an account? Get "Exploited this week" by email every MondayDon't want an account? RSS feed for microsoft records

Running WordPress? Scan your site free with WP Lens

Is your version affected? Check it

Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

We use this product, ask for help

Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
microsoftwindows 10 1607
microsoftwindows 10 1809
microsoftwindows 10 21h2
microsoftwindows 10 22h2
microsoftwindows 11 23h2
microsoftwindows server 2008
microsoftwindows server 2012
microsoftwindows server 2016
microsoftwindows server 2019
microsoftwindows server 2022
microsoftwindows server 2022 23h2

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • microsoft windows server 2008all versions
  • microsoft windows server 2008r2
  • microsoft windows server 2012all versions
  • microsoft windows server 2012r2
  • microsoft windows server 2016before 10.0.14393.8783
  • microsoft windows server 2019before 10.0.17763.8276
  • microsoft windows server 2022before 10.0.20348.4648
  • microsoft windows server 2022 23h2before 10.0.25398.2092

Versions reported by the vendor

Affected version ranges reported by the assigning authority (microsoft). Independent of NVD's CPE analysis and usually ahead of it.

  • Microsoft Windows 10 Version 1607

    • 10.0.14393.0 and later · before 10.0.14393.8783affected

  • Microsoft Windows 10 Version 1809

    • 10.0.17763.0 and later · before 10.0.17763.8276affected

  • Microsoft Windows 10 Version 21H2

    • 10.0.19044.0 and later · before 10.0.19044.6809affected

  • Microsoft Windows 10 Version 22H2

    • 10.0.19045.0 and later · before 10.0.19045.6809affected

  • Microsoft Windows 11 version 23H2

    • 10.0.22631.0 and later · before 10.0.22631.6491affected

  • Microsoft Windows 11 Version 23H2

    • 10.0.22631.0 and later · before 10.0.22631.6491affected

  • Microsoft Windows Server 2008 R2 Service Pack 1

    • 6.1.7601.0 and later · before 6.1.7601.28117affected

  • Microsoft Windows Server 2008 R2 Service Pack 1 (Server Core installation)

    • 6.1.7601.0 and later · before 6.1.7601.28117affected

  • Microsoft Windows Server 2008 Service Pack 2

    • 6.0.6003.0 and later · before 6.0.6003.23717affected

  • Microsoft Windows Server 2008 Service Pack 2 (Server Core installation)

    • 6.0.6003.0 and later · before 6.0.6003.23717affected

  • Microsoft Windows Server 2012

    • 6.2.9200.0 and later · before 6.2.9200.25868affected

  • Microsoft Windows Server 2012 (Server Core installation)

    • 6.2.9200.0 and later · before 6.2.9200.25868affected

Same product

microsoft: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-33824Windows Internet Key Exchange (IKE) Service Extensions Remote Code Execution VulnerabilityKEV
    92Now
  • CVE-2018-8174A remote code execution vulnerability exists in the way that the VBScript engine handles objects in memory, aka "Windows VBScript Engine RemKEV
    86Now
  • CVE-2026-21510Windows Shell Security Feature Bypass VulnerabilityKEV
    83Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-20926Jan 13, 2026 · Windows SMB Server Elevation of Privilege Vulnerability
    30Monitor
  • ← EarlierCVE-2026-20927Jan 13, 2026 · Windows SMB Server Denial of Service Vulnerability
    21Monitor
  • Later →CVE-2026-20931Jan 13, 2026 · Windows Telephony Service Elevation of Privilege Vulnerability
    32Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Windows 10 Version 1607 for 32-bit Systems10.0.14393.8783 · KB5073722Microsoft (MSRC)
Windows 10 Version 1607 for x64-based Systems10.0.14393.8783 · KB5073722Microsoft (MSRC)
Windows 10 Version 1809 for 32-bit Systems10.0.17763.8276 · KB5073723Microsoft (MSRC)
Windows 10 Version 1809 for x64-based Systems10.0.17763.8276 · KB5073723Microsoft (MSRC)
Windows 10 Version 21H2 for 32-bit Systems10.0.19044.6809 · KB5073724Microsoft (MSRC)
Windows 10 Version 21H2 for ARM64-based Systems10.0.19044.6809 · KB5073724Microsoft (MSRC)
Windows 10 Version 21H2 for x64-based Systems10.0.19044.6809 · KB5073724Microsoft (MSRC)
Windows 10 Version 22H2 for 32-bit Systems10.0.19045.6809 · KB5073724Microsoft (MSRC)
Windows 10 Version 22H2 for ARM64-based Systems10.0.19045.6809 · KB5073724Microsoft (MSRC)
Windows 10 Version 22H2 for x64-based Systems10.0.19045.6809 · KB5073724Microsoft (MSRC)
Windows 11 Version 23H2 for ARM64-based Systems10.0.22631.6491 · KB5073455Microsoft (MSRC)
Windows 11 Version 23H2 for x64-based Systems10.0.22631.6491 · KB5073455Microsoft (MSRC)
Windows Server 2008 for 32-bit Systems Service Pack 26.0.6003.23717 · KB5073697Microsoft (MSRC)
Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation)6.0.6003.23717 · KB5073697Microsoft (MSRC)
Windows Server 2008 for x64-based Systems Service Pack 26.0.6003.23717 · KB5073697Microsoft (MSRC)
Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation)6.0.6003.23717 · KB5073697Microsoft (MSRC)
Windows Server 2008 R2 for x64-based Systems Service Pack 16.1.7601.28117 · KB5073695Microsoft (MSRC)
Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)6.1.7601.28117 · KB5073695Microsoft (MSRC)
Windows Server 20126.2.9200.25868 · KB5073698Microsoft (MSRC)
Windows Server 2012 (Server Core installation)6.2.9200.25868 · KB5073698Microsoft (MSRC)
Windows Server 2012 R26.3.9600.22968 · KB5073696Microsoft (MSRC)
Windows Server 2012 R2 (Server Core installation)6.3.9600.22968 · KB5073696Microsoft (MSRC)
Windows Server 201610.0.14393.8783 · KB5073722Microsoft (MSRC)
Windows Server 2016 (Server Core installation)10.0.14393.8783 · KB5073722Microsoft (MSRC)
Windows Server 201910.0.17763.8276 · KB5073723Microsoft (MSRC)
Windows Server 2019 (Server Core installation)10.0.17763.8276 · KB5073723Microsoft (MSRC)
Windows Server 202210.0.20348.4648 · KB5073457Microsoft (MSRC)
Windows Server 2022 (Server Core installation)10.0.20348.4648 · KB5073457Microsoft (MSRC)
Windows Server 2022, 23H2 Edition (Server Core installation)10.0.25398.2092 · KB5073450Microsoft (MSRC)

Exploit status

Weaponized

A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.

Evidence

  • Metasploit module ×3

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Metasploit moduleauxiliary/server/relay/esc8_kerberosESC8 Relay: SMB to HTTP(S) via Kerberosauxiliary—
Metasploit moduleauxiliary/spoof/dhcp/dhcpv6_dns_takeoverDHCPv6 DNS Takeover (mitm6-style IPv6 DNS coercion)auxiliary—
Metasploit moduleauxiliary/spoof/ipv6/ipv6_ra_dns_takeoverIPv6 Router Advertisement DNS Takeover (RDNSS IPv6 DNS coercion)auxiliary—

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-2125528 days apartWindows Hyper-V Security Feature Bypass Vulnerability
    35Monitor
  • CVE-2026-208430 days apartWindows Routing and Remote Access Service (RRAS) Elevation of Privilege Vulnerability
    32Monitor
  • CVE-2026-2123828 days apartWindows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability
    32Monitor
  • CVE-2025-5951735 days apartWindows Storage VSP Driver Elevation of Privilege Vulnerability
    32Monitor
  • CVE-2025-5951263 days apartCustomer Experience Improvement Program (CEIP) Elevation of Privilege Vulnerability
    32Monitor
  • CVE-2025-6070563 days apartWindows Client-Side Caching Elevation of Privilege Vulnerability
    32Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
High
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-284 · Improper Access Control

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records