CVE-1999-1129

High CVSS 7.5

Published 1999-09-01 · last changed 2026-06-16

The fix

We hold no Microsoft remediation data for CVE-1999-1129, which normally means it is not a Windows CVE. For non-Microsoft software the fix is the vendor's own updated release, and the affected versions are listed below.

What it is

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.

Sources

NVD record for CVE-1999-1129

CVSS vector: AV:N/AC:L/Au:N/C:P/I:P/A:P