Microsoft Windows 95/NT 4.0 TCP SYN Country denial of service

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.1$0-$5k0.00

Summaryinfo

A vulnerability has been found in Microsoft Windows 95/NT 4.0 and classified as critical. The affected element is an unknown function of the component TCP SYN Handler. Performing a manipulation results in denial of service (Country). This vulnerability is identified as CVE-1999-0016. Additionally, an exploit exists. Due to its background and reception, this vulnerability has an historic impact. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as critical has been found in Microsoft Windows 95/NT 4.0 (Operating System). This affects an unknown part of the component TCP SYN Handler. The manipulation with an unknown input leads to a denial of service vulnerability (Land). CWE is classifying the issue as CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. This is going to have an impact on availability.

The issue has been introduced in 08/24/1995. The weakness was released 12/01/1997 (Website). It is possible to read the advisory at www1.itrc.hp.com. This vulnerability is uniquely identified as CVE-1999-0016. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are unknown but a public exploit is available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 04/17/2026). Due to its background and reception, this vulnerability has a historic impact.

A public exploit has been developed in ANSI C. The exploit is shared for download at securityfocus.com. It is declared as highly functional. The vulnerability was handled as a non-public zero-day exploit for at least 830 days. During that time the estimated underground price was around $25k-$100k. The vulnerability scanner Nessus provides a plugin with the ID 16850 (HP-UX PHNE_14017 : s700_800 11.00 cumulative ARPA Transport patch), which helps to determine the existence of the flaw in a target environment. It is assigned to the family HP-UX Local Security Checks and running in the context l.

Upgrading to version 98 or 2000 eliminates this vulnerability. A possible mitigation has been published 3 months after the disclosure of the vulnerability. Furthermore it is possible to detect and prevent this kind of attack with TippingPoint and the filter 51.

The vulnerability is also documented in the databases at X-Force (912), Exploit-DB (20810), Tenable (16850), SecurityFocus (BID 2666†) and Vulnerability Center (SBV-189†). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.1

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Name: Land
Class: Denial of service / Land
CWE: CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Highly functional
Programming Language: 🔍
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 16850
Nessus Name: HP-UX PHNE_14017 : s700_800 11.00 cumulative ARPA Transport patch
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍
Nessus Port: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Upgrade: Windows 98/2000
Suricata ID: 2100527
Suricata Class: 🔍
Suricata Message: 🔍

TippingPoint: 🔍

McAfee IPS: 🔍
McAfee IPS Version: 🔍

SourceFire IPS: 🔍
ISS Proventia IPS: 🔍

Timelineinfo

08/24/1995 🔍
11/20/1997 +819 days 🔍
11/20/1997 +0 days 🔍
12/01/1997 +11 days 🔍
12/01/1997 +0 days 🔍
02/11/1998 +72 days 🔍
10/22/2002 +1714 days 🔍
02/16/2005 +848 days 🔍
06/18/2014 +3409 days 🔍
04/17/2026 +4321 days 🔍

Sourcesinfo

Vendor: microsoft.com
Product: microsoft.com

Advisory: www1.itrc.hp.com
Status: Confirmed

CVE: CVE-1999-0016 (🔍)
GCVE (CVE): GCVE-0-1999-0016
GCVE (VulDB): GCVE-100-14031

OVAL: 🔍

X-Force: 912
SecurityFocus: 2666 - Multiple Vendor loopback (land.c) Denial of Service Vulnerability
Vulnerability Center: 189 - [cisco-sa-19971121-land] Host is Vulnerable to Land IP DoS Attack, High

scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 06/18/2014 17:33
Updated: 04/17/2026 04:20
Changes: 06/18/2014 17:33 (84), 05/05/2019 12:51 (4), 11/29/2024 18:47 (19), 04/17/2026 04:20 (1)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Are you interested in using VulDB?

Download the whitepaper to learn more about our service!