# CVE-1999-0153: Microsoft Windows 95/NT denial of service in NetBIOS via OOB data

Source: https://junglewise.ai/threats/cve-1999-0153-microsoft-windows-95-nt-denial-of-service-in-netbios-via-oob-data  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 1997-07-01. Updated: 2026-05-10  
License: CC BY 4.0 with a link back

CVE-1999-0153 · Severity: medium · CVSS 5 · Published 1997-07-01

A vulnerability in older Microsoft Windows operating systems allows a remote attacker to crash a computer by sending a specifically crafted network packet. This attack, historically known as 'WinNuke', targets the system's networking components and results in a 'Blue Screen of Death,' causing immediate service disruption and potential data loss for unsaved work. It does not allow the attacker to steal data, but it can be used to repeatedly take systems offline.

Technologies: [Microsoft Windows 2000](https://junglewise.ai/threats/technologies/windows-2000), [Microsoft Windows 95](https://junglewise.ai/threats/technologies/windows-95), [Microsoft Windows Nt](https://junglewise.ai/threats/technologies/windows-nt), [Sco Openserver](https://junglewise.ai/threats/technologies/openserver). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft), [Sco](https://junglewise.ai/threats/vendors/sco).

## Quick answers

**Is CVE-1999-0153 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-1999-0153 being exploited in the wild.

**How severe is CVE-1999-0153?** Medium severity, with a CVSS score of 5, published 1 July 1997.

**Which products and versions are affected?** Microsoft Windows 95; Microsoft Windows NT.

**Is there a fix for CVE-1999-0153?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-1999-0153 attacked?** It is attacked over the network, in an operating system.

**Am I affected by CVE-1999-0153?** Check whether you run Microsoft Windows 2000, Microsoft Windows 95, Microsoft Windows Nt or one of the others listed. 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

The vulnerability is a denial of service (DoS) caused by the incorrect handling of TCP 'out-of-band' (OOB) data by the Windows networking stack. An attacker can trigger the flaw by sending a TCP packet with the URG (Urgent) flag set to port 139 (NetBIOS). When the operating system receives this unexpected OOB data on the NetBIOS session, it fails to process it correctly, leading to a kernel panic and a Blue Screen of Death (BSOD). This is a network-based attack that requires no authentication and no user interaction. Microsoft released patches for this issue shortly after its discovery in 1997.

## Affected products

- Microsoft Windows 95
- Microsoft Windows NT

## Timeline

- 1997-07-01: disclosed: Initial publication of the vulnerability.

## References

- [http://www.osvdb.org/1666](http://www.osvdb.org/1666)

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