{"id":"CVE-1999-0453","aliases":["EUVD-1999-0453","GHSA-x3m2-cfrc-7vhc"],"status":"published","title":"An attacker can identify a CISCO device by sending a SYN packet to port 1999, which is for the...","description":"An attacker can identify a CISCO device by sending a SYN packet to port 1999, which is for the Cisco Discovery Protocol (CDP).","severity":{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:P/I:N/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.01415,"percentile":0.72946,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-200"],"published":"1999-01-01T05:00:00Z","modified":"2026-06-16T21:48:25Z","products":[{"vendor":"cisco","product":"router"}],"references":[{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/CVE-1999-0453","tags":["x_refsource_MISC","x_transferred"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-1999-0453"},{"url":"https://github.com/advisories/GHSA-x3m2-cfrc-7vhc"}],"sources":{"cve":[{"id":"CVE-1999-0453","description":"An attacker can identify a CISCO device by sending a SYN packet to port 1999, which is for the Cisco Discovery Protocol (CDP).","status":"published","published":"2000-02-04T05:00:00Z","modified":"2024-08-01T16:41:45.387Z","updated_at":"2026-11-02T14:33:53.911988Z"}],"euvd":[{"id":"EUVD-1999-0453","description":"An attacker can identify a CISCO device by sending a SYN packet to port 1999, which is for the Cisco Discovery Protocol (CDP).","status":"published","published":"2000-02-04T05:00:00Z","modified":"2024-08-01T16:41:45Z","updated_at":"2026-11-03T03:50:47.002367Z"}],"ghsa":[{"id":"GHSA-x3m2-cfrc-7vhc","title":"An attacker can identify a CISCO device by sending a SYN packet to port 1999, which is for the...","description":"An attacker can identify a CISCO device by sending a SYN packet to port 1999, which is for the Cisco Discovery Protocol (CDP).","status":"published","published":"2022-04-30T18:10:38Z","modified":"2023-01-29T05:01:26Z","cwes":["CWE-200"],"updated_at":"2026-11-02T14:44:49.414884Z"}],"nvd":[{"id":"CVE-1999-0453","description":"An attacker can identify a CISCO device by sending a SYN packet to port 1999, which is for the Cisco Discovery Protocol (CDP).","status":"published","published":"1999-01-01T05:00:00Z","modified":"2026-06-16T21:48:25.71Z","cvss":[{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:P/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-200"],"updated_at":"2026-11-02T13:58:30.236077Z"}]}}