Linux Kernel 2.6.20.1 TCP Port authentication spoofing

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.2$0-$5k0.00

Summaryinfo

A vulnerability has been found in Linux Kernel 2.6.20.1 and classified as critical. This issue affects some unknown processing of the component TCP Port Handler. The manipulation leads to authentication spoofing. This vulnerability is traded as CVE-1999-0074. There is no exploit available. Due to its background and reception, this vulnerability has an historic impact. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Linux Kernel 2.6.20.1 (Operating System) and classified as critical. This issue affects an unknown part of the component TCP Port Handler. The manipulation with an unknown input leads to a authentication spoofing vulnerability. Using CWE to declare the problem leads to CWE-290. This attack-focused weakness is caused by incorrectly implemented authentication schemes that are subject to spoofing attacks. Impacted is confidentiality, and integrity. The summary by CVE is:

Listening TCP ports are sequentially allocated, allowing spoofing attacks.

The issue has been introduced in 02/05/2007. The weakness was shared 07/01/1997. The identification of this vulnerability is CVE-1999-0074. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 04/16/2026). Due to its background and reception, this vulnerability has a historic impact.

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the databases at X-Force (209), SecurityFocus (BID 77880†) and Vulnerability Center (SBV-580†). Be aware that VulDB is the high quality source for vulnerability data.

Affected

  • FreeBSD
  • Linux Kernel 2.6.20.1
  • Microsoft Windows NT 4.0
  • NetBSD 2.0.4

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.2

VulDB Base Score: 6.5
VulDB Temp Score: 6.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Authentication spoofing
CWE: CWE-290 / CWE-287
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

07/01/1997 🔍
07/01/1997 +0 days 🔍
07/01/1997 +0 days 🔍
07/01/1997 +0 days 🔍
12/30/2002 +2008 days 🔍
02/05/2007 +1498 days 🔍
06/18/2014 +2690 days 🔍
04/16/2026 +4320 days 🔍

Sourcesinfo

Vendor: kernel.org

Status: Confirmed

CVE: CVE-1999-0074 (🔍)
GCVE (CVE): GCVE-0-1999-0074
GCVE (VulDB): GCVE-100-13919
X-Force: 209
SecurityFocus: 77880 - Linux kernel CVE-1999-0074 Remote Security Vulnerability
Vulnerability Center: 580 - CVE Id, Medium

Entryinfo

Created: 06/18/2014 11:56
Updated: 04/16/2026 20:17
Changes: 06/18/2014 11:56 (57), 05/07/2019 15:36 (2), 04/16/2026 20:17 (19)
Complete: 🔍
Cache ID: 216::103

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

Discussion

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