{"id":"CVE-1999-1129","aliases":["EUVD-1999-1110","GHSA-29q9-4h2h-9p7g"],"status":"published","title":"Cisco Catalyst 2900 Virtual LAN (VLAN) switches allow remote attackers to inject 802.1q frames...","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.","severity":{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.01588,"percentile":0.75787,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"published":"1999-09-01T04:00:00Z","modified":"2026-06-16T21:49:46Z","products":[{"vendor":"cisco","product":"catalyst_2900_vlan"},{"vendor":"cisco","product":"ios"}],"references":[{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/3294","tags":["vdb-entry","x_refsource_XF","x_transferred"]},{"url":"http://www.cisco.com/univercd/cc/td/doc/product/lan/28201900/1928v8x/eescg8x/aleakyv.htm","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]},{"url":"http://www.securityfocus.com/archive/1/26008","tags":["mailing-list","x_refsource_BUGTRAQ","x_transferred","Patch","Vendor Advisory"]},{"url":"http://www.securityfocus.com/bid/615","tags":["vdb-entry","x_refsource_BID","x_transferred","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-1999-1129"},{"url":"https://github.com/advisories/GHSA-29q9-4h2h-9p7g"}],"sources":{"cve":[{"id":"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.","status":"published","published":"2001-09-12T04:00:00Z","modified":"2024-08-01T17:02:53.702Z","updated_at":"2026-11-02T14:33:53.295018Z"}],"euvd":[{"id":"EUVD-1999-1110","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.","status":"published","published":"2001-09-12T04:00:00Z","modified":"2024-08-01T17:02:53Z","updated_at":"2026-11-03T03:50:43.777799Z"}],"ghsa":[{"id":"GHSA-29q9-4h2h-9p7g","title":"Cisco Catalyst 2900 Virtual LAN (VLAN) switches allow remote attackers to inject 802.1q frames...","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.","status":"published","published":"2022-04-30T18:11:52Z","modified":"2023-01-30T05:04:41Z","updated_at":"2026-11-02T14:47:05.929455Z"}],"nvd":[{"id":"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.","status":"published","published":"1999-09-01T04:00:00Z","modified":"2026-06-16T21:49:46.94Z","cvss":[{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary"}],"updated_at":"2026-11-02T13:58:40.923898Z"}]}}