Unrated severityNVD Advisory· Published Sep 1, 1999· Updated Jun 16, 2026
CVE-1999-1129
CVE-1999-1129
Description
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.
Affected products
3cpe:2.3:h:cisco:catalyst_2900_vlan:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:h:cisco:catalyst_2900_vlan:*:*:*:*:*:*:*:*
- (no CPE)
- cpe:2.3:o:cisco:ios:11.2\(8\)sa5:*:*:*:*:*:*:*
Patches
Vulnerability mechanics
References
4- www.securityfocus.com/archive/1/26008nvdPatchVendor Advisory
- www.securityfocus.com/bid/615nvdPatchVendor Advisory
- www.cisco.com/univercd/cc/td/doc/product/lan/28201900/1928v8x/eescg8x/aleakyv.htmnvdVendor Advisory
- exchange.xforce.ibmcloud.com/vulnerabilities/3294nvd
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