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Vulnerability record · CVE-1999-1129 · published 1 September 1999

CVE-1999-1129: Cisco ios vulnerability

Cisco · Ios

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.

7.5 CVSS 2.0 High EPSS 1.6% · top 25.2%
7.5CVSS 2.0 base score
1.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
8References
16 Jun 2026Last modified by NVD

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.

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

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.cisco.com/univercd/cc/td/doc/product/lan/28201900/1928v8x/eescg8x/aleakyv.htm Vendor Advisory
http://www.securityfocus.com/archive/1/26008 PatchVendor Advisory
http://www.securityfocus.com/bid/615 PatchVendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/3294
http://www.cisco.com/univercd/cc/td/doc/product/lan/28201900/1928v8x/eescg8x/aleakyv.htm Vendor Advisory
http://www.securityfocus.com/archive/1/26008 PatchVendor Advisory
http://www.securityfocus.com/bid/615 PatchVendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/3294

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-1999-1129), CISA KEV, FIRST EPSS (scores of 2026-10-05). This page is refreshed as NVD updates the record.