{"id":"CVE-1999-0063","aliases":["EUVD-1999-0063","GHSA-h9f6-v64j-cw96"],"status":"published","title":"Cisco IOS 12.0 and other versions can be crashed by malicious UDP packets to the syslog port.","description":"Cisco IOS 12.0 and other versions can be crashed by malicious UDP packets to the syslog port.","severity":{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.08247,"percentile":0.94936,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":false},"published":"1999-01-11T05:00:00Z","modified":"2026-06-16T21:47:29Z","exploits":[{"source":"exploitdb","id":"EDB-19531","title":"Cisco IOS 12.0.2 - Syslog Crash","type":"dos","platform":"hardware","date":"1999-01-11","verified":true,"url":"https://www.exploit-db.com/exploits/19531"}],"products":[{"vendor":"cisco","product":"ios"}],"references":[{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/CVE-1999-0063","tags":["x_refsource_MISC","x_transferred"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-1999-0063"},{"url":"https://github.com/advisories/GHSA-h9f6-v64j-cw96"}],"sources":{"cve":[{"id":"CVE-1999-0063","description":"Cisco IOS 12.0 and other versions can be crashed by malicious UDP packets to the syslog port.","status":"published","published":"1999-09-29T04:00:00Z","modified":"2024-08-01T16:27:57.325Z","updated_at":"2026-11-02T14:33:53.60785Z"}],"euvd":[{"id":"EUVD-1999-0063","description":"Cisco IOS 12.0 and other versions can be crashed by malicious UDP packets to the syslog port.","status":"published","published":"1999-09-29T04:00:00Z","modified":"2024-08-01T16:27:57Z","updated_at":"2026-11-03T03:50:48.358727Z"}],"ghsa":[{"id":"GHSA-h9f6-v64j-cw96","title":"Cisco IOS 12.0 and other versions can be crashed by malicious UDP packets to the syslog port.","description":"Cisco IOS 12.0 and other versions can be crashed by malicious UDP packets to the syslog port.","status":"published","published":"2022-04-30T18:09:54Z","modified":"2023-01-29T05:00:52Z","updated_at":"2026-11-02T14:44:41.183486Z"}],"nvd":[{"id":"CVE-1999-0063","description":"Cisco IOS 12.0 and other versions can be crashed by malicious UDP packets to the syslog port.","status":"published","published":"1999-01-11T05:00:00Z","modified":"2026-06-16T21:47:29.447Z","cvss":[{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"updated_at":"2026-11-02T13:58:30.236077Z"}]}}