AI description
CVE-2026-100222 is a heap-based buffer overflow vulnerability, also associated with an integer underflow, affecting the Network Policy Server (NPS) component in Microsoft Windows. NPS serves as Microsoft's RADIUS server and proxy, which centralizes authentication, authorization, and accounting for enterprise Wi-Fi, VPNs, and remote-access systems. The flaw allows an unauthenticated, unauthorized attacker to execute arbitrary code over a network by sending a specially crafted packet to the affected service. Because the vulnerability stems from incorrect buffer size calculations when handling malformed network input, exploitation requires no user interaction or existing account credentials. The vulnerability affects various versions of Microsoft Windows and Windows Server, including Windows Server 2016, 2019, 2022, and 2025. Microsoft addressed the issue in its October 2026 Patch Tuesday updates. To mitigate exposure, security teams are advised to apply the official security updates and restrict network access to NPS instances, ensuring only authorized RADIUS clients can communicate with the service.
- Description
- Heap-based buffer overflow in Network Policy Server (NPS) allows an unauthorized attacker to execute code over a network.
- Source
- secure@microsoft.com
- NVD status
- Analyzed
- Products
- windows_10_1607, windows_10_1809, windows_10_21h2, windows_10_22h2, windows_11_23h2, windows_11_24h2, windows_11_25h2, windows_11_26h1, windows_11_26h2, windows_server_2012, windows_server_2016, windows_server_2019, windows_server_2022, windows_server_2025
CVSS 3.1
- Type
- Secondary
- Base score
- 9.8
- Impact score
- 5.9
- Exploitability score
- 3.9
- Vector string
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Severity
- CRITICAL
- secure@microsoft.com
- CWE-122
Hype score is a measure of social media activity compared against trending CVEs from the past 12 months. Max score 100.
- Hype score
14
🚨 Critical Windows + High Linux alerts CVE-2026-100222 (CVSS 9.8): unauthenticated RCE in Windows Server NPS/RADIUS. Install the Oct 2026 cumulative update; restrict UDP 1812/1813/1645/1646 until then. CVE-2026-92162 (CVSS 7.2): Flatpak path traversal that can lead to root. ht
@thenovacyberXBT
20 Oct 2026
9622 Impressions
9 Retweets
8 Likes
8 Bookmarks
0 Replies
0 Quotes
CVE advisory: CVE-2026-100222 - microsoft: Network Policy Server (NPS) Remote Code Execution Vulnerability. https://t.co/BAGT0rRy84 #CVE #CyberSecurity #Microsoft #WindowsServer
@vulnipulse
19 Oct 2026
22 Impressions
0 Retweets
0 Likes
0 Bookmarks
1 Reply
0 Quotes
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