CVE-1999-1129

NONECVSS 0.0

0.0

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.

CVSS v3: —
EG Score: —
EPSS: 75.6%
KEV: Not listed

Published

September 1, 1999

Last Modified

April 16, 2026

References (8)

cve@mitrehttp://www.cisco.com/univercd/cc/td/doc/product/lan/28201900/1928v8x/eescg8x/aleakyv.htm
cve@mitrehttp://www.securityfocus.com/archive/1/26008
cve@mitrehttp://www.securityfocus.com/bid/615
cve@mitrehttps://exchange.xforce.ibmcloud.com/vulnerabilities/3294
af854a3a-2127-422b-91ae-364da2661108http://www.cisco.com/univercd/cc/td/doc/product/lan/28201900/1928v8x/eescg8x/aleakyv.htm
af854a3a-2127-422b-91ae-364da2661108http://www.securityfocus.com/archive/1/26008
af854a3a-2127-422b-91ae-364da2661108http://www.securityfocus.com/bid/615
af854a3a-2127-422b-91ae-364da2661108https://exchange.xforce.ibmcloud.com/vulnerabilities/3294

Data Freshness Timeline

(refreshed 13× in last 7d / 19× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

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Frequently asked(4)

What is CVE-1999-1129?

CVE-1999-1129 is a none vulnerability published on September 1, 1999. 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.

When was CVE-1999-1129 disclosed?

CVE-1999-1129 was first published in the National Vulnerability Database on September 1, 1999, with the most recent update on April 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-1999-1129 actively exploited?

CVE-1999-1129 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 75.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

How do I remediate CVE-1999-1129?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-1999-1129, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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CVE-1999-1129

📅 Published

🔄 Last Modified

🔗 References (8)