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CVE-2026-40405Patch(microsoft / windows_11_24h2)

LOWCVSS 7.5 · 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

Null pointer dereference in Windows TCP/IP allows an unauthorized attacker to deny service over a network.

microsoft CVEsBack to dashboard
1.0/ 10 priority

Sources & remediation

Vendor / third-party advisories
Weakness type (CWE)
CWE-476

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

NONE

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_11_26h1
  • windows_server_2025

Threat summary

  • Patch or workaround signal is available
  • 1 mentions across 1 observed day

What's happening

  • Patch or workaround mentioned in 1 signal
  • Technical details provided in 1 signal
  • 1 total mentions across 1 day

Affected systems

Vendors
microsoft
Products
windows_11_24h2windows_11_25h2windows_11_26h1windows_server_2025

Deep dive

Activity timeline1 mentions / 1d
00111Mentions · 2026-05-12: 1Patch / Workaround · 2026-05-12: 1Technical Details · 2026-05-12: 105-12
Signal classification1 categories
Patch
1100.0%
Referenced assets1 URL
Full discourse1 post
  • WindowsForum@windowsforum
    Patch

    🛑 CVE-2026-40405 is a Null Pointer DoS: not glamorous RCE, but your TCP/IP stack still faceplants on network traffic. Translation: patch fast or your uptime takes the hit. #Windows #Security https://windowsforum.com/threads/cve-2026-40405-important-windows-tcp-ip-dos-null-pointer-fix-for-windows-11-server-2025.417843/?utm_source=x&utm_medium=social&utm_campaign=news_node84 #DenialOfService #PatchTuesday #WindowsTcpIp #Cve202640405 https://t.co/B2dkP5oYmN

    Post summary

    The tweet highlights a CVE-2026-40405 Null Pointer DoS in Windows’ TCP/IP stack, urges rapid patching, and links to a fix article, but provides no evidence of active exploitation or a PoC.

    0000041
    1.1K followersView on X
CPE platform detail7 entries

7 of 7 entries

PartVendorProductVersionTarget SWTarget HW
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_2025---

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