CVE-2026-83862(microsoft / windows_10_1607)

LOWCVSS 8.8 · HIGH

Immediate actions

  • Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

Use after free in Windows Network Load Balancing allows an unauthorized attacker to execute code over an adjacent network.

0.5/ 10 priority

Sources & remediation

Weakness type (CWE)
CWE-416

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_10_1607
  • windows_10_1809
  • windows_server_2012
  • windows_server_2016

Affected systems

Vendors
Products
windows_10_1607windows_10_1809windows_server_2012windows_server_2016windows_server_2019windows_server_2022windows_server_2025

2 versions affected across 7 products

Deep dive

Full discourse2 posts
  • multilayer@multilayer

    Microsoftが米国時間10/23、Windowsのネットワーク負荷分散(NLB)の脆弱性CVE-2026-83862のCVSSを訂正した。 攻撃元の区分が「隣接」、つまり同じレイヤー2のネットワークからに直され、スコアは9.8から8.8に下がったとのこと。 ネットワーク越しにどこからでも狙えるわけではなく、同じネットワークセグメントにいる攻撃者が前提になる。 10月の更新プログラムを当てていれば、追加の作業はいらない。 9.8を見て急いで対応の段取りを組んでいた場合は、更新プログラムが適用済みかを確かめれば十分で、優先順位も見直せる。 #Microsoft #Windows #NLB #脆弱性 https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83862

    0000057
    820 followersView on X
  • Windows Forum@windowsforum

    🚨 An unauthenticated packet can turn Windows NLB into a server takeover buffet. CVSS 8.8 is Microsoft-speak for “patch it before your subnet becomes the attacker’s LAN party.” https://windowsforum.com/news/cve-2026-83862-windows-network-load-balancing-remote-code-execution-vulnerability.449778/?utm_source=x&utm_medium=social&utm_campaign=news_node84 #MicrosoftSecurity #Msrc #Cve202683862 https://t.co/dIQtaIedYq

    0000046
    1.4K followersView on X
CPE platform detail10 entries

10 of 10 entries

PartVendorProductVersionTarget SWTarget HW
OSmicrosoftwindows_10_1607--x64
OSmicrosoftwindows_10_1607--x86
OSmicrosoftwindows_10_1809--x64
OSmicrosoftwindows_10_1809--x86
OSmicrosoftwindows_server_2012---
OSmicrosoftwindows_server_2012r2--
OSmicrosoftwindows_server_2016---
OSmicrosoftwindows_server_2019---
OSmicrosoftwindows_server_2022---
OSmicrosoftwindows_server_2025--x64

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