CVE-2023-36603Network attack vector

Remote crash via TCP/IP null pointer dereference

Published Oct 10, 2023 · Updated Apr 14, 2025

A null pointer dereference in Windows TCP/IP allows remote attackers to crash affected Windows 10, Windows 11, and Windows Server systems. Microsoft identifies the TCP/IP stack as the locus but has not disclosed the packet field or code path that dereferences the null pointer. No privileges or user interaction are required; successful exploitation interrupts only availability, with no reported data exposure or modification.

CVSS severity7.5
High
EPSS probability2.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

A null pointer dereference in Windows TCP/IP allows remote attackers to crash affected Windows 10, Windows 11, and Windows Server systems. Microsoft identifies the TCP/IP stack as the locus but has not disclosed the packet field or code path that dereferences the null pointer. No privileges or user interaction are required; successful exploitation interrupts only availability, with no reported data exposure or modification.

The record

CVE
CVE-2023-36603
Published
Oct 10, 2023
Updated
Apr 14, 2025
Vendor
Microsoft
Product
Windows Server 2019
Classifications
CWE-476, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 10, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 14, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.0.17763.0 <10.0.17763.4974

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · Windows Server 2019version=10.0.17763.0 <10.0.17763.4974
Microsoft · Windows 11 version 21H2version=10.0.0 <10.0.22000.2538
Microsoft · Windows 10 Version 21H2version=10.0.19043.0 <10.0.19041.3570
Microsoft · Windows 10 Version 22H2version=10.0.19045.0 <10.0.19045.3570
Microsoft · Windows Server 2019 (Server Core installation)version=10.0.17763.0 <10.0.17763.4974
Microsoft · Windows 11, version 22H2version=10.0.22621.0 <10.0.22621.2428
Microsoft · Windows Server 2022version=10.0.20348.0 <10.0.20348.2031
Microsoft · Windows 10 Version 1809version=10.0.0 <10.0.17763.4974; version=10.0.17763.0 <10.0.17763.4974

Published CVSS scores

7.5Microsoft CorporationCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo