CVE-2026-40413
published 2026-05-12CVE-2026-40413: Null pointer dereference in Windows TCP/IP allows an unauthorized attacker to deny service over an adjacent network.
PriorityP337high7.4CVSS 3.1
AVAACLPRNUINSCCNINAH
EPSS
0.40%
32.4th percentile
Null pointer dereference in Windows TCP/IP allows an unauthorized attacker to deny service over an adjacent network.
Affected
31 ranges· showing 25
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| microsoft | windows_10_1607 | < 10.0.14393.9140 | 10.0.14393.9140 |
| microsoft | windows_10_1809 | < 10.0.17763.8755 | 10.0.17763.8755 |
| microsoft | windows_10_21h2 | < 10.0.19044.7291 | 10.0.19044.7291 |
| microsoft | windows_10_22h2 | < 10.0.19045.7291 | 10.0.19045.7291 |
| microsoft | windows_10_version_1607 | >= 10.0.14393.0 < 10.0.14393.9140 | 10.0.14393.9140 |
| microsoft | windows_10_version_1809 | >= 10.0.17763.0 < 10.0.17763.8755 | 10.0.17763.8755 |
| microsoft | windows_10_version_21h2 | >= 10.0.19044.0 < 10.0.19044.7291 | 10.0.19044.7291 |
| microsoft | windows_10_version_22h2 | >= 10.0.19045.0 < 10.0.19045.7417 | 10.0.19045.7417 |
| microsoft | windows_10_version_22h2 | >= 10.0.19045.0 < 10.0.19045.7291 | 10.0.19045.7291 |
| microsoft | windows_11_23h2 | < 10.0.22631.7079 | 10.0.22631.7079 |
| microsoft | windows_11_24h2 | < 10.0.26100.8390 | 10.0.26100.8390 |
| microsoft | windows_11_25h2 | < 10.0.26200.8390 | 10.0.26200.8390 |
| microsoft | windows_11_26h1 | < 10.0.28000.2113 | 10.0.28000.2113 |
| microsoft | windows_11_version_22h3 | >= 10.0.22631.0 < 10.0.22631.7079 | 10.0.22631.7079 |
| microsoft | windows_11_version_23h2 | >= 10.0.22631.0 < 10.0.22631.7079 | 10.0.22631.7079 |
| microsoft | windows_11_version_23h2 | >= 10.0.22631.0 < 10.0.22631.7219 | 10.0.22631.7219 |
| microsoft | windows_11_version_24h2 | >= 10.0.26100.0 < 10.0.26100.8457 | 10.0.26100.8457 |
| microsoft | windows_11_version_25h2 | >= 10.0.26200.0 < 10.0.26200.8457 | 10.0.26200.8457 |
| microsoft | windows_11_version_26h1 | >= 10.0.28000.0 < 10.0.28000.2113 | 10.0.28000.2113 |
| microsoft | windows_server_2012 | — | — |
| microsoft | windows_server_2012 | >= 6.2.9200.0 < 6.2.9200.26079 | 6.2.9200.26079 |
| microsoft | windows_server_2012_r2 | >= 6.3.9600.0 < 6.3.9600.23181 | 6.3.9600.23181 |
| microsoft | windows_server_2016 | < 10.0.14393.9140 | 10.0.14393.9140 |
| microsoft | windows_server_2016 | >= 10.0.14393.0 < 10.0.14393.9140 | 10.0.14393.9140 |
| microsoft | windows_server_2019 | < 10.0.17763.8755 | 10.0.17763.8755 |
CVSS provenance
nvdv3.17.4HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
cvelistv5v3.17.4HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C
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VulDB
Microsoft Windows up to Server 2025 TCP/IP null pointer dereference
vuldb·2026-05-12
CVE-2026-40413 [CRITICAL] Microsoft Windows up to Server 2025 TCP/IP null pointer dereference
A vulnerability described as critical has been identified in Microsoft Windows. This affects an unknown part of the component TCPIP. Such manipulation leads to null pointer dereference.
This vulnerability is referenced as CVE-2026-40413. The attack needs to be initiated within the local network. No exploit is available.
Upgrading the affected component is recommended.
CVEList
Windows TCP/IP Denial of Service Vulnerability
cvelistv5·2026-05-12·CVSS 7.4
CVE-2026-40413 [HIGH] CWE-476 Windows TCP/IP Denial of Service Vulnerability
Windows TCP/IP Denial of Service Vulnerability
Windows TCP/IP Denial of Service Vulnerability
GHSA
GHSA-jf9h-cjw5-p35f: Null pointer dereference in Windows TCP/IP allows an unauthorized attacker to deny service over an adjacent network
ghsa_unreviewed·2026-05-12
CVE-2026-40413 [HIGH] CWE-476 GHSA-jf9h-cjw5-p35f: Null pointer dereference in Windows TCP/IP allows an unauthorized attacker to deny service over an adjacent network
Null pointer dereference in Windows TCP/IP allows an unauthorized attacker to deny service over an adjacent network.
No detection rules found.
No public exploits indexed.
Rapid7
Patch Tuesday - May 2026
blogs_rapid7·2026-05-13·CVSS 10.0
CVE-2026-41089 [CRITICAL] Patch Tuesday - May 2026
Microsoft is publishing 137 vulnerabilities on May 2026 Patch Tuesday . Microsoft is not aware of exploitation in the wild or public disclosure for any of these vulnerabilities. So far this month, Microsoft has provided patches to address 133 browser vulnerabilities, which are not included in the Patch Tuesday count above.
## Windows Netlogon: critical RCE
Anyone responsible for securing a domain controller should prioritize remediation of CVE-2026-41089 , which is a critical stack-based buffer overflow in Windows Netlogon with a CVSS v3 base score of 9.8. Exploitation leads to execution in the context of the Netlogon service, so that’s SYSTEM privileges on the domain controller. For most pentesters, that’s the point at which the customer report more or less writes itself. No privileges
Sans Isc
Microsoft May 2026 Patch Tuesday, (Tue, May 12th)
blogs_sans_isc·2026-05-12·CVSS 4.3
CVE-2026-41103 [MEDIUM] Microsoft May 2026 Patch Tuesday, (Tue, May 12th)
Microsoft May 2026 Patch Tuesday
Published: 2026-05-12. Last Updated: 2026-05-12 18:29:36 UTC
by Johannes Ullrich (Version: 1)
0 comment(s)
Today's Microsoft patch Tuesday fixes 137 different vulnerabilities. In addition, the update addresses 137 Chromium-related issues affecting Microsoft Edge.
There are no already disclosed or already exploited vulnerabilities included in today's patches. I removed the Chromium issues from the table below and included only the 137 Microsoft issues to make it more readable.
Note that issues related to Microsoft Azure are labeled as "no customer action required.
Significant Vulnerabilities of interest:
CVE-2026-41103: This vulnerability affects the Microsoft SSO Plugin for Jira & Confluence. Exploitation could lead to an elevation of privileges. Wit
2026-05-12
Published