What is the severity of CVE-1999-1129?

CVE-1999-1129 is considered a high severity vulnerability due to the potential for VLAN hopping and unauthorized access to different network segments.

How do I fix CVE-1999-1129?

To fix CVE-1999-1129, ensure that proper VLAN configurations are in place and disable trunking on ports where it is not required.

Which systems are affected by CVE-1999-1129?

CVE-1999-1129 affects Cisco Catalyst 2900 VLAN switches and specific versions of Cisco IOS.

What are the potential impacts of CVE-1999-1129?

The potential impacts of CVE-1999-1129 include unauthorized access, data interception, and compromised network integrity.

Is there a workaround for CVE-1999-1129?

A potential workaround for CVE-1999-1129 includes implementing port security features and monitoring VLAN configurations to prevent unauthorized frame injection.

Vulnerability/
CVE-1999-1129

high

7.5

CWE

NVD-CWE-Other

1/9/1999

12/9/2001

3/4/2025

CVE-1999-1129

First published: Wed Sep 01 1999(Updated: )

Cisco Catalyst 2900 Virtual LAN (VLAN) switches allow remote attackers to inject 802.1q frames into another VLAN by forging the VLAN identifier in the trunking tag.

Credit: cve@mitre.org cve@mitre.org

Affected Software	Affected Version	How to fix
Puppet Cisco IOS	=11.2\(8\)sa5
Cisco Catalyst 2900
Cisco IOS	=11.2\(8\)sa5

Remedy

http://www.securityfocus.com/archive/1/26008

Remedy

http://www.securityfocus.com/bid/615

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Reference Links

Frequently Asked Questions

What is the severity of CVE-1999-1129?
CVE-1999-1129 is considered a high severity vulnerability due to the potential for VLAN hopping and unauthorized access to different network segments.
How do I fix CVE-1999-1129?
To fix CVE-1999-1129, ensure that proper VLAN configurations are in place and disable trunking on ports where it is not required.
Which systems are affected by CVE-1999-1129?
CVE-1999-1129 affects Cisco Catalyst 2900 VLAN switches and specific versions of Cisco IOS.
What are the potential impacts of CVE-1999-1129?
The potential impacts of CVE-1999-1129 include unauthorized access, data interception, and compromised network integrity.
Is there a workaround for CVE-1999-1129?
A potential workaround for CVE-1999-1129 includes implementing port security features and monitoring VLAN configurations to prevent unauthorized frame injection.

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agent/last-modified-date
agent/softwarecombine
agent/tags
collector/nvd-api
source/NVD
agent/software-canonical-lookup
vendor/cisco
canonical/puppet cisco ios
version/puppet cisco ios/11.2\(8\)sa5
canonical/cisco catalyst 2900
canonical/cisco ios
version/cisco ios/11.2\(8\)sa5

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