CVE-2026-27921Disclosure(microsoft / windows_10_1607)

LOWCVSS 7.0 · 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

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows TCP/IP allows an authorized attacker to elevate privileges locally.

0.5/ 10 priority

Sources & remediation

Weakness type (CWE)
CWE-362CWE-416

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

  • 3 mentions across 3 observed days
  • Momentum state: stable

What's happening

  • Technical details provided in 3 signals
  • Disclosure: 3 classified signals
  • Peaked 2d ago at 1 mentions (2026-04-14); latest day: 1
  • 3 total mentions across 3 days

Affected systems

Vendors
Products
windows_10_1607windows_10_1809windows_10_21h2windows_10_22h2windows_11_23h2windows_11_24h2windows_11_25h2windows_11_26h1windows_server_2012windows_server_2016

2 versions affected across 14 products

Deep dive

Activity timeline3 mentions / 3d
00111Mentions · 2026-04-14: 1Mentions · 2026-04-15: 1Mentions · 2026-04-17: 1Technical Details · 2026-04-14: 1Technical Details · 2026-04-15: 1Technical Details · 2026-04-17: 104-1404-1504-17
Signal classification1 categories
Disclosure
3100.0%
Referenced assets2 URLs
Full discourse3 posts
  • kawn@kawn2020
    Disclosure

    #windowsupdate #microsoft つづき ・CVE-2026-27914 7.8 Microsoft 管理コンソール ・CVE-2026-27921 7  Windows TCP/IP ・CVE-2026-32070 7  Windows 共通ログ ファイル システム ドライバー ・CVE-2026-32075 7  Windows ユニバーサル プラグ アンド プレイ (UPnP) デバイス ホスト …

    Post summary

    The tweet lists several new Microsoft-related CVEs along with their CVSS scores and affected components, but does not provide any proof of concept, exploit, or mitigation information.

    1000088
    85 followersView on X
  • CVE@CVEnew
    Disclosure

    CVE-2026-27921 Concurrent execution using shared resource with improper synchronization ('race condition') in Windows TCP/IP allows an authorized attacker to elevate privileges loca… https://www.cve.org/CVERecord?id=CVE-2026-27921

    Post summary

    CVE-2026-27921 is a race condition in Windows TCP/IP that can enable an authorized attacker to elevate privileges; the post provides no exploit, patch, or active exploitation details.

    00000118
    57.2K followersView on X
  • 0day Signal@0dayPublishing
    Disclosure

    ⚠️ CVE-2026-27921: Windows TDI Translation Driver ... Race condition in tdx.sys TCP/IP stack = kernel-level privilege escalation with local access - classic TOCTOU attack ve... https://zerodaysignal.com/vulnerability/CVE-2026-27921 #netsec #vulnerability #CVE #sysadmin #zeroday

    Post summary

    The post announces CVE-2026-27921, describing a race condition in tdx.sys that allows local privilege escalation via a TOCTOU attack, but does not provide PoC, exploit code, or patch information.

    0000072
    218 followersView on X
CPE platform detail25 entries

25 of 25 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_11_26h1--arm64
OSmicrosoftwindows_11_26h1--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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