VulnSocial

CVE-2026-21238Disclosure(microsoft / windows_10_1607)

LOWCVSS 7.8 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

Improper access control in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

microsoft CVEsBack to dashboard
0.5/ 10 priority

Sources & remediation

Vendor / third-party advisories
Weakness type (CWE)
CWE-284

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

STABLE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • windows_10_1607
  • windows_10_1809
  • windows_10_21h2
  • windows_10_22h2

Threat summary

  • 2 mentions across 2 observed days
  • Momentum state: stable

What's happening

  • Technical details provided in 1 signal
  • Disclosure: 1 classified signal
  • General: 1 classified signal
  • Peaked 1d ago at 1 mentions (2026-02-10); latest day: 1
  • 2 total mentions across 2 days

Affected systems

Vendors
microsoft
Products
windows_10_1607windows_10_1809windows_10_21h2windows_10_22h2windows_11_23h2windows_11_24h2windows_11_25h2windows_server_2012windows_server_2016windows_server_2019

2 versions affected across 13 products

Deep dive

Activity timeline2 mentions / 2d
00111Mentions · 2026-02-10: 1Mentions · 2026-02-11: 1Technical Details · 2026-02-10: 102-1002-11
Signal classification2 categories
Disclosure
150.0%
General
150.0%
Referenced assets1 URL
By indicator
Classification over time
DateTotalLabels
2026-02-101
Disclosure1
2026-02-111
General1
Full discourse2 posts
  • kawn@kawn2020
    General

    #windowsupdate #microsoft (つづき) ・CVE-2026-21238　7.8　Windows Ancillary Function Driver for WinSock ・CVE-2026-21241　7　　Windows Ancillary Function Driver for WinSock ・CVE-2026-21253　7　　メールスロット ファイル システム ・CVE-2026-21511　7.5　Microsoft Office Outlook

    Post summary

    The post merely lists a handful of CVEs with their CVSS scores and affected components, lacking any discussion of exploitation, mitigation, or technical depth.

    10000123
    89 followersView on X
  • CVE@CVEnew
    Disclosure

    CVE-2026-21238 Improper access control in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally. https://www.cve.org/CVERecord?id=CVE-2026-21238

    Post summary

    The post announces a local privilege‑elevation vulnerability in Windows Ancillary Function Driver for WinSock, providing basic technical details but no PoC, exploit, active exploitation, or patch information.

    00010137
    56.5K followersView on X
CPE platform detail23 entries

23 of 23 entries

PartVendorProductVersionTarget SWTarget HW
OSmicrosoftwindows_10_1607--x64
OSmicrosoftwindows_10_1607--x86
OSmicrosoftwindows_10_1809--x64
OSmicrosoftwindows_10_1809--x86
OSmicrosoftwindows_10_21h2--arm64
OSmicrosoftwindows_10_21h2--x64
OSmicrosoftwindows_10_21h2--x86
OSmicrosoftwindows_10_22h2--arm64
OSmicrosoftwindows_10_22h2--x64
OSmicrosoftwindows_10_22h2--x86
OSmicrosoftwindows_11_23h2--arm64
OSmicrosoftwindows_11_23h2--x64
OSmicrosoftwindows_11_24h2--arm64
OSmicrosoftwindows_11_24h2--x64
OSmicrosoftwindows_11_25h2--arm64
OSmicrosoftwindows_11_25h2--x64
OSmicrosoftwindows_server_2012---
OSmicrosoftwindows_server_2012r2--
OSmicrosoftwindows_server_2016---
OSmicrosoftwindows_server_2019---
OSmicrosoftwindows_server_2022---
OSmicrosoftwindows_server_2022_23h2---
OSmicrosoftwindows_server_2025---

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