VulnSocial

CVE-2026-21245Disclosure(microsoft / windows_11_24h2)

LOWCVSS 7.8 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Patch microsoft windows_11_24h2 systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

Heap-based buffer overflow in Windows Kernel 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-122CWE-787

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

STABLE

Are you affected?

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

  • windows_11_24h2
  • windows_11_25h2
  • windows_server_2025

Threat summary

  • Patch or workaround signal is available
  • 2 mentions across 2 observed days
  • Momentum state: stable

What's happening

  • Patch or workaround mentioned in 1 signal
  • Technical details provided in 1 signal
  • Disclosure: 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_11_24h2windows_11_25h2windows_server_2025

Deep dive

Activity timeline2 mentions / 2d
00111Mentions · 2026-02-10: 1Mentions · 2026-03-12: 1Patch / Workaround · 2026-03-12: 1Technical Details · 2026-02-10: 102-1003-12
Signal classification2 categories
Disclosure
150.0%
Patch
150.0%
Referenced assets2 URLs
Classification over time
DateTotalLabels
2026-02-101
Disclosure1
2026-03-121
Patch1
Full discourse2 posts
  • Doctor Kloud@doctorkloud
    Patch

    Noyau Windows compromis : élévation de privilèges silencieuse, l'attaquant devient SYSTEM sans bruit. Patch immédiat. Pas de workaround fiable. Exposer un poste non patché, c'est offrir les clés de l'AD. #CVE-2026-21245 https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21245

    Post summary

    The tweet warns of a silent kernel privilege‑escalation flaw (CVE‑2026‑21245) and stresses that a vendor patch is available immediately, urging timely remediation.

    0000053
    13 followersView on X
  • CVE@CVEnew
    Disclosure

    CVE-2026-21245 Heap-based buffer overflow in Windows Kernel allows an authorized attacker to elevate privileges locally. https://www.cve.org/CVERecord?id=CVE-2026-21245

    Post summary

    The text provides a brief disclosure of a heap-based buffer overflow in the Windows Kernel that allows local privilege escalation.

    00000133
    56.5K followersView on X
CPE platform detail5 entries

5 of 5 entries

PartVendorProductVersionTarget SWTarget HW
OSmicrosoftwindows_11_24h2--arm64
OSmicrosoftwindows_11_24h2--x64
OSmicrosoftwindows_11_25h2--arm64
OSmicrosoftwindows_11_25h2--x64
OSmicrosoftwindows_server_2025---

Explore more

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