Search/CVE-1999-1129
● CVE

CVE-1999-1129

VendorciscoProductios, catalyst 2900 vlanDiscoveredSep 1, 1999UpdatedApr 16, 2026

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.

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CVSS v3.1
—
EPSS
1.59%
probability of exploitation in 30 days
CISA KEV
Not listed
no confirmed exploitation reported
News coverage
0
sources referencing this CVE
Related IOCs
0
seen in the same coverage
EPSS Trend
Aug 16, 2026 → Sep 16, 2026
▼ 0.01pp
1.60% → 1.59% over 2 tracked changes
Connections
2 relationships
Timeline
disclosure → media coverage
Sep 1, 1999
Disclosure — published as a CVE record. · last revised by NVD Apr 16, 2026