HOMEVULNERABILITIESCVE-2026-40414
HIGH

CVE-2026-40414

CWE-476Published: May 12, 2026· Updated: May 15, 2026

7.4
CVSS v3.1
EPSS:0.14%probability of exploitation in 30 daysPercentile:33.7th

Official Description

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

NVD Source

Technical Analysis

CVE-2026-40414 requires adjacent network access, limiting remote exploitation but still posing risk in shared or local network environments.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.4.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorAdjacent
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeChanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Affected Vendors & Products

Microsoft14 products
windows 10 1607windows 10 1809windows 10 21h2windows 10 22h2windows 11 23h2windows 11 24h2windows 11 25h2windows 11 26h1windows server 2012windows server 2016windows server 2019windows server 2022+2 more
Source: NVD CPE · 15 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40414

All References (1)

→
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40414Vendor Advisory

Quick Facts

CVE IDCVE-2026-40414
CVSS Score7.4 / 10
SeverityHIGH
WeaknessCWE-476
CISA KEVNo
EPSS (30d)0.14%
Affected1 vendor
PublishedMay 12, 2026

Related CVEs (CWE-476)

CVE-2026-33063
8.7
CVE-2026-13084
8.7
CVE-2026-28224
8.2
CVE-2026-25165
7.8
CVE-2026-31792
7.8
CVE-2025-59606
7.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-40414 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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