{"id":"CVE-2003-0795","aliases":["EUVD-2003-0786","GHSA-77hp-5q78-94cv"],"status":"published","title":"The vty layer in Quagga before 0.96.4, and Zebra 0.93b and earlier, does not verify that sub...","description":"The vty layer in Quagga before 0.96.4, and Zebra 0.93b and earlier, does not verify that sub-negotiation is taking place when processing the SE marker, which allows remote attackers to cause a denial of service (crash) via a malformed telnet command to the telnet CLI port, which may trigger a null dereference.","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":0.08431,"percentile":0.95033,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":false},"cwes":["CWE-20"],"published":"2003-11-18T05:00:00Z","modified":"2026-06-16T22:02:51Z","exploits":[{"source":"exploitdb","id":"EDB-23375","title":"GNU Zebra 0.9x / Quagga 0.96 - Remote Denial of Service","type":"dos","platform":"linux","date":"2003-11-12","verified":true,"url":"https://www.exploit-db.com/exploits/23375"}],"products":[{"vendor":"gnu","product":"zebra"},{"vendor":"quagga","product":"quagga"},{"vendor":"sgi","product":"propack"}],"references":[{"url":"http://www.redhat.com/support/errata/RHSA-2003-305.html","tags":["vendor-advisory","x_refsource_REDHAT","x_transferred","Patch","Vendor Advisory"]},{"url":"http://marc.info/?l=bugtraq\u0026m=106883387304266\u0026w=2","tags":["mailing-list","x_refsource_BUGTRAQ","x_transferred"]},{"url":"http://www.debian.org/security/2004/dsa-415","tags":["vendor-advisory","x_refsource_DEBIAN","x_transferred","Patch","Vendor Advisory"]},{"url":"http://secunia.com/advisories/10563","tags":["third-party-advisory","x_refsource_SECUNIA","x_transferred","Vendor Advisory"]},{"url":"http://www.redhat.com/support/errata/RHSA-2003-307.html","tags":["vendor-advisory","x_refsource_REDHAT","x_transferred","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2003-0795"},{"url":"https://github.com/advisories/GHSA-77hp-5q78-94cv"}],"sources":{"cve":[{"id":"CVE-2003-0795","description":"The vty layer in Quagga before 0.96.4, and Zebra 0.93b and earlier, does not verify that sub-negotiation is taking place when processing the SE marker, which allows remote attackers to cause a denial of service (crash) via a malformed telnet command to the telnet CLI port, which may trigger a null dereference.","status":"published","published":"2003-11-18T05:00:00Z","modified":"2024-08-08T02:05:12.613Z","updated_at":"2026-11-02T14:20:16.757505Z"}],"euvd":[{"id":"EUVD-2003-0786","description":"The vty layer in Quagga before 0.96.4, and Zebra 0.93b and earlier, does not verify that sub-negotiation is taking place when processing the SE marker, which allows remote attackers to cause a denial of service (crash) via a malformed telnet command to the telnet CLI port, which may trigger a null dereference.","status":"published","published":"2003-11-18T05:00:00Z","modified":"2024-08-08T02:05:12Z","updated_at":"2026-11-03T01:15:06.016782Z"}],"ghsa":[{"id":"GHSA-77hp-5q78-94cv","title":"The vty layer in Quagga before 0.96.4, and Zebra 0.93b and earlier, does not verify that sub...","description":"The vty layer in Quagga before 0.96.4, and Zebra 0.93b and earlier, does not verify that sub-negotiation is taking place when processing the SE marker, which allows remote attackers to cause a denial of service (crash) via a malformed telnet command to the telnet CLI port, which may trigger a null dereference.","status":"published","published":"2022-04-29T01:27:00Z","modified":"2023-01-30T05:01:42Z","cwes":["CWE-20"],"updated_at":"2026-11-02T14:46:27.869667Z"}],"nvd":[{"id":"CVE-2003-0795","description":"The vty layer in Quagga before 0.96.4, and Zebra 0.93b and earlier, does not verify that sub-negotiation is taking place when processing the SE marker, which allows remote attackers to cause a denial of service (crash) via a malformed telnet command to the telnet CLI port, which may trigger a null dereference.","status":"published","published":"2003-12-15T05:00:00Z","modified":"2026-06-16T22:02:51.25Z","cvss":[{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:00:47.41445Z"}]}}