# CVE-2026-33827: Microsoft Windows TCP/IP race condition remote code execution

Source: https://junglewise.ai/threats/cve-2026-33827-microsoft-windows-tcp-ip-race-condition-remote-code-execution  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-04-14. Updated: 2026-07-25  
License: CC BY 4.0 with a link back

CVE-2026-33827 · Severity: high · CVSS 8.1 · Published 2026-04-14

A critical vulnerability exists in the Windows networking component (TCP/IP) that handles how computers communicate over a network. An attacker could exploit this flaw to remotely run unauthorized code on a target system without any user interaction. This could lead to a complete system takeover, data theft, or significant operational disruption across affected Windows and Windows Server versions.

Technologies: [Microsoft Windows 11](https://junglewise.ai/threats/technologies/windows-11), [Microsoft Windows 10](https://junglewise.ai/threats/technologies/windows-10), [Microsoft Windows Server 2012](https://junglewise.ai/threats/technologies/windows-server-2012). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-33827 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-33827 being exploited in the wild.

**How severe is CVE-2026-33827?** High severity, with a CVSS score of 8.1, published 14 April 2026.

**Which products and versions are affected?** Microsoft Windows 11 22H3, 23H2, 24H2, 25H2, 26H1; Microsoft Windows 10 1607, 1809, 21H2, 22H2; Microsoft Windows Server 2012 R2 and Gold.

**Is there a fix for CVE-2026-33827?** A patch was published on 2026-04-14: Security updates made available by Microsoft Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-33827 attacked?** It is attacked over the network, in an operating system.

**Am I affected by CVE-2026-33827?** Check whether you run Microsoft Windows 11, Microsoft Windows 10 or Microsoft Windows Server 2012 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A race condition (CWE-362) exists in the Windows TCP/IP stack due to improper synchronization when concurrent executions access a shared resource. The vulnerability is reachable over the network and does not require user interaction or elevated privileges, though the attack complexity is rated as high, likely due to the precise timing required to win the race condition. Successful exploitation allows for remote code execution (RCE) in the context of the system. Microsoft has released security updates to address this issue across supported versions of Windows 10, Windows 11, and Windows Server 2012.

## Affected products

- Microsoft Windows 10 1607, 1809, 21H2, 22H2
- Microsoft Windows 11 22H3, 23H2, 24H2, 25H2, 26H1
- Microsoft Windows Server 2012 R2 and Gold

## Timeline

- 2026-04-14: advisory: Initial disclosure by Microsoft and NVD
- 2026-04-14: patched: Security updates made available by Microsoft

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33827](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33827)

## Related threats

- [Microsoft Windows Recovery Environment UEFI/BIOS password bypass](https://junglewise.ai/threats/cve-2026-116638-the-windows-recovery-environment-winre-in-windows-10-and-11-may)
- [Windows DNS Server out-of-bounds read](https://junglewise.ai/threats/cve-2026-97844-out-of-bounds-read-in-dns-server-allows-an-authorized-attacker-to)
- [Windows DNS Server out-of-bounds read information disclosure](https://junglewise.ai/threats/cve-2026-97843-out-of-bounds-read-in-dns-server-allows-an-authorized-attacker-to)
- [Windows DNS Server out-of-bounds read information disclosure](https://junglewise.ai/threats/cve-2026-97842-out-of-bounds-read-in-dns-server-allows-an-authorized-attacker-to)
- [Windows DNS Server out-of-bounds read](https://junglewise.ai/threats/cve-2026-97841-out-of-bounds-read-in-dns-server-allows-an-authorized-attacker-to)