{"id":"CVE-2005-3774","aliases":["EUVD-2005-3769","GHSA-46r6-jr5x-j746"],"status":"published","title":"Cisco PIX 6.3 and 7.0 allows remote attackers to cause a denial of service (blocked new...","description":"Cisco PIX 6.3 and 7.0 allows remote attackers to cause a denial of service (blocked new connections) via spoofed TCP packets that cause the PIX to create embryonic connections that that would not produce a valid connection with the end system, including (1) SYN packets with invalid checksums, which do not result in a RST; or, from an external interface, (2) one byte of \"meaningless data,\" or (3) a TTL that is one less than needed to reach the internal destination.","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":0.18207,"percentile":0.97228,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":false},"published":"2005-11-23T00:00:00Z","modified":"2026-06-16T22:17:36Z","exploits":[{"source":"exploitdb","id":"EDB-1338","title":"Cisco PIX - Spoofed TCP SYN Packets Remote Denial of Service","type":"dos","platform":"hardware","date":"2005-11-23","verified":true,"url":"https://www.exploit-db.com/exploits/1338"},{"source":"exploitdb","id":"EDB-26548","title":"Cisco PIX - TCP SYN Packet Denial of Service","type":"dos","platform":"hardware","date":"2005-11-22","verified":true,"url":"https://www.exploit-db.com/exploits/26548"}],"products":[{"vendor":"cisco","product":"pix"}],"references":[{"url":"http://securitytracker.com/id?1015256","tags":["vdb-entry","x_refsource_SECTRACK","x_transferred"]},{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/25079","tags":["vdb-entry","x_refsource_XF","x_transferred"]},{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/25077","tags":["vdb-entry","x_refsource_XF","x_transferred"]},{"url":"http://www.osvdb.org/24140","tags":["vdb-entry","x_refsource_OSVDB","x_transferred"]},{"url":"http://www.securityfocus.com/bid/15525","tags":["vdb-entry","x_refsource_BID","x_transferred"]},{"url":"http://www.cisco.com/en/US/products/hw/vpndevc/ps2030/products_security_notice09186a0080624a37.html","tags":["x_refsource_CONFIRM","x_transferred"]},{"url":"http://lists.grok.org.uk/pipermail/full-disclosure/2005-November/038983.html","tags":["mailing-list","x_refsource_FULLDISC","x_transferred"]},{"url":"http://www.securityfocus.com/archive/1/426989/100/0/threaded","tags":["mailing-list","x_refsource_BUGTRAQ","x_transferred"]},{"url":"http://www.cisco.com/warp/public/707/cisco-response-20051122-pix.shtml","tags":["vendor-advisory","x_refsource_CISCO","x_transferred"]},{"url":"http://www.securityfocus.com/archive/1/426991/100/0/threaded","tags":["mailing-list","x_refsource_BUGTRAQ","x_transferred"]},{"url":"http://www.kb.cert.org/vuls/id/853540","tags":["third-party-advisory","x_refsource_CERT-VN","x_transferred","US Government Resource"]},{"url":"http://secunia.com/advisories/17670","tags":["third-party-advisory","x_refsource_SECUNIA","x_transferred"]},{"url":"http://www.securityfocus.com/archive/1/427041/100/0/threaded","tags":["mailing-list","x_refsource_BUGTRAQ","x_transferred"]},{"url":"http://www.vupen.com/english/advisories/2005/2546","tags":["vdb-entry","x_refsource_VUPEN","x_transferred"]},{"url":"http://www.securityfocus.com/archive/1/417458/30/0/threaded","tags":["mailing-list","x_refsource_BUGTRAQ","x_transferred"]},{"url":"http://lists.grok.org.uk/pipermail/full-disclosure/2005-November/038971.html","tags":["mailing-list","x_refsource_FULLDISC","x_transferred","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2005-3774"},{"url":"https://github.com/advisories/GHSA-46r6-jr5x-j746"}],"sources":{"cve":[{"id":"CVE-2005-3774","description":"Cisco PIX 6.3 and 7.0 allows remote attackers to cause a denial of service (blocked new connections) via spoofed TCP packets that cause the PIX to create embryonic connections that that would not produce a valid connection with the end system, including (1) SYN packets with invalid checksums, which do not result in a RST; or, from an external interface, (2) one byte of \"meaningless data,\" or (3) a TTL that is one less than needed to reach the internal destination.","status":"published","published":"2005-11-23T00:00:00Z","modified":"2024-08-07T23:24:36.214Z","updated_at":"2026-11-02T14:33:38.550354Z"}],"euvd":[{"id":"EUVD-2005-3769","description":"Cisco PIX 6.3 and 7.0 allows remote attackers to cause a denial of service (blocked new connections) via spoofed TCP packets that cause the PIX to create embryonic connections that that would not produce a valid connection with the end system, including (1) SYN packets with invalid checksums, which do not result in a RST; or, from an external interface, (2) one byte of \"meaningless data,\" or (3) a TTL that is one less than needed to reach the internal destination.","status":"published","published":"2005-11-23T00:00:00Z","modified":"2024-08-07T23:24:36Z","updated_at":"2026-11-03T01:15:25.261993Z"}],"ghsa":[{"id":"GHSA-46r6-jr5x-j746","title":"Cisco PIX 6.3 and 7.0 allows remote attackers to cause a denial of service (blocked new...","description":"Cisco PIX 6.3 and 7.0 allows remote attackers to cause a denial of service (blocked new connections) via spoofed TCP packets that cause the PIX to create embryonic connections that that would not produce a valid connection with the end system, including (1) SYN packets with invalid checksums, which do not result in a RST; or, from an external interface, (2) one byte of \"meaningless data,\" or (3) a TTL that is one less than needed to reach the internal destination.","status":"published","published":"2022-05-01T02:21:00Z","modified":"2023-01-30T05:07:31Z","updated_at":"2026-11-02T14:47:42.643657Z"}],"nvd":[{"id":"CVE-2005-3774","description":"Cisco PIX 6.3 and 7.0 allows remote attackers to cause a denial of service (blocked new connections) via spoofed TCP packets that cause the PIX to create embryonic connections that that would not produce a valid connection with the end system, including (1) SYN packets with invalid checksums, which do not result in a RST; or, from an external interface, (2) one byte of \"meaningless data,\" or (3) a TTL that is one less than needed to reach the internal destination.","status":"published","published":"2005-11-23T00:03:00Z","modified":"2026-06-16T22:17:36.003Z","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":"2026-11-02T14:00:57.365803Z"}]}}