CVE-2026-33841Patch(microsoft / windows_10_21h2)

LOWCVSS 7.8 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Patch microsoft windows_10_21h2 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.

1.0/ 10 priority

Sources & remediation

Weakness type (CWE)
CWE-122

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_10_21h2
  • windows_10_22h2
  • windows_11_23h2
  • windows_11_24h2

Threat summary

  • Patch or workaround signal is available
  • 3 mentions across 3 observed days
  • Momentum state: stable

What's happening

  • Patch or workaround mentioned in 1 signal
  • Technical details provided in 3 signals
  • General: 1 classified signal
  • Disclosure: 1 classified signal
  • Peaked 2d ago at 1 mentions (2026-05-12); latest day: 1
  • 3 total mentions across 3 days

Affected systems

Vendors
Products
windows_10_21h2windows_10_22h2windows_11_23h2windows_11_24h2windows_11_25h2windows_11_26h1windows_server_2022windows_server_2022_23h2windows_server_2025

Deep dive

Activity timeline3 mentions / 3d
00111Mentions · 2026-05-12: 1Mentions · 2026-05-13: 1Mentions · 2026-05-15: 1Patch / Workaround · 2026-05-12: 1Technical Details · 2026-05-12: 1Technical Details · 2026-05-13: 1Technical Details · 2026-05-15: 105-1205-1305-15
Signal classification3 categories
Patch
133.3%
General
133.3%
Disclosure
133.3%
Referenced assets2 URLs
Classification over time
DateTotalLabels
2026-05-121
Patch1
2026-05-131
General1
2026-05-151
Disclosure1
Full discourse3 posts
  • kawn@kawn2020
    General

    #windowsupdate #microsoft つづき ・CVE-2026-33841 7.8 Windows カーネル ・CVE-2026-35416 7  WinSock 用 Windows Ancillary Function Driver ・CVE-2026-35417 7.8 Windows Win32K: ICOMP ・CVE-2026-35435 8.6 Azure AI Foundry M365 公開済みエージェント つづく…

    Post summary

    The post lists several new CVEs with their severity scores and affected components but provides no evidence of exploit availability, active use, or mitigation guidance.

    10000109
    85 followersView on X
  • Israel@f1tym1
    Disclosure

    CVE-2026-33841 | Microsoft Windows up to Server 2025 Kernel heap-based overflow (WID-SEC-2026-1489) https://ift.tt/lfyCYLE A vulnerability has been found in Microsoft Windows up to Server 2025 and classified as critical. This vulnerability affects unknown code of the component…

    Post summary

    A critical kernel heap‑based overflow (CVE‑2026‑33841) affecting Microsoft Windows Server up to 2025 has been reported, with no PoC, patch, or active exploitation details disclosed.

    0000069
    974 followersView on X
  • WindowsForum@windowsforum
    Patch

    🚨 CVE-2026-33841 kernel EoP again: heap overflow + “authorized local attacker” is Windows’ way of saying insider/low-priv access can turn into admin. May 2026 patch time. https://windowsforum.com/threads/cve-2026-33841-windows-kernel-eop-may-2026-patch-you-shouldn-t-ignore.417720/?utm_source=x&utm_medium=social&utm_campaign=news_node84 #WindowsKernel #PatchTuesday #LocalPrivilegeEscalation #Cve202633841 https://t.co/dfBXsfpJDP

    Post summary

    The message highlights CVE‑2026‑33841 as a kernel privilege‑escalation flaw via a heap overflow, noting that a patch will be released in May 2026.

    0000062
    1.1K followersView on X
CPE platform detail17 entries

17 of 17 entries

PartVendorProductVersionTarget SWTarget HW
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_2022---
OSmicrosoftwindows_server_2022_23h2---
OSmicrosoftwindows_server_2025---

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