{"id":"CVE-2012-4435","aliases":["DEBIAN-CVE-2012-4435","EUVD-2012-4369","GHSA-jvjc-qf53-pgj7"],"status":"published","title":"fwknop before 2.0.3 does not properly validate IP addresses, which allows remote authenticated...","description":"fwknop before 2.0.3 does not properly validate IP addresses, which allows remote authenticated users to cause a denial of service (server crash) via a long IP address.","severity":{"version":"2.0","score":4,"vector":"AV:N/AC:L/Au:S/C:N/I:N/A:P","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-07","score":0.02329,"percentile":0.83622,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-20"],"published":"2012-10-22T23:00:00Z","modified":"2026-10-23T17:47:40Z","fixes":[{"ecosystem":"Debian:12","package":"fwknop","fixed_in":["2.0.3-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"fwknop","fixed_in":["2.0.3-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"fwknop","fixed_in":["2.0.3-1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"fwknop","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.3-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"fwknop","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.3-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"fwknop","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.3-1"}]}]}],"products":[{"vendor":"cipherdyne","product":"fwknop"}],"references":[{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/79568","tags":["vdb-entry","x_refsource_XF","x_transferred","web"]},{"url":"http://www.openwall.com/lists/oss-security/2012/09/19/2","tags":["mailing-list","x_refsource_MLIST","x_transferred","web"]},{"url":"http://www.openwall.com/lists/oss-security/2012/09/20/4","tags":["mailing-list","x_refsource_MLIST","x_transferred","web"]},{"url":"http://www.cipherdyne.org/blog/2012/09/software-release-fwknop-2.0.3.html","tags":["x_refsource_CONFIRM","x_transferred","Vendor Advisory","advisory"]},{"url":"http://www.cipherdyne.org/cgi-bin/gitweb.cgi?p=fwknop.git%3Ba=commitdiff%3Bh=263fa01f2af1d336961df320f1c7a9ea84ddac9a","tags":["x_refsource_CONFIRM","x_transferred","web"]},{"url":"http://www.cipherdyne.org/cgi-bin/gitweb.cgi?p=fwknop.git%3Ba=commitdiff%3Bh=f4c16bc47fc24a96b63105556b62d61c1ba7d799","tags":["x_refsource_CONFIRM","x_transferred","web"]},{"url":"http://www.openwall.com/lists/oss-security/2012/09/20/2","tags":["mailing-list","x_refsource_MLIST","x_transferred","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2012-4435"},{"url":"http://www.cipherdyne.org/cgi-bin/gitweb.cgi?p=fwknop.git;a=commitdiff;h=263fa01f2af1d336961df320f1c7a9ea84ddac9a"},{"url":"http://www.cipherdyne.org/cgi-bin/gitweb.cgi?p=fwknop.git;a=commitdiff;h=f4c16bc47fc24a96b63105556b62d61c1ba7d799"},{"url":"https://github.com/advisories/GHSA-jvjc-qf53-pgj7"},{"url":"https://security-tracker.debian.org/tracker/CVE-2012-4435","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2012-4435","description":"fwknop before 2.0.3 does not properly validate IP addresses, which allows remote authenticated users to cause a denial of service (server crash) via a long IP address.","status":"published","published":"2012-10-22T23:00:00Z","modified":"2024-08-06T20:35:09.649Z","updated_at":"2026-11-02T14:34:51.937988Z"}],"euvd":[{"id":"EUVD-2012-4369","description":"fwknop before 2.0.3 does not properly validate IP addresses, which allows remote authenticated users to cause a denial of service (server crash) via a long IP address.","status":"published","published":"2012-10-22T23:00:00Z","modified":"2024-08-06T20:35:09Z","updated_at":"2026-11-03T01:56:07.912368Z"}],"ghsa":[{"id":"GHSA-jvjc-qf53-pgj7","title":"fwknop before 2.0.3 does not properly validate IP addresses, which allows remote authenticated...","description":"fwknop before 2.0.3 does not properly validate IP addresses, which allows remote authenticated users to cause a denial of service (server crash) via a long IP address.","status":"published","published":"2022-05-17T01:41:59Z","modified":"2025-04-11T04:05:18Z","cwes":["CWE-20"],"updated_at":"2026-11-02T15:01:12.54248Z"}],"nvd":[{"id":"CVE-2012-4435","description":"fwknop before 2.0.3 does not properly validate IP addresses, which allows remote authenticated users to cause a denial of service (server crash) via a long IP address.","status":"published","published":"2012-10-22T23:55:07.07Z","modified":"2026-06-16T23:45:05.32Z","cvss":[{"version":"2.0","score":4,"vector":"AV:N/AC:L/Au:S/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:02:16.536025Z"}],"osv":[{"id":"CVE-2012-4435","description":"fwknop before 2.0.3 does not properly validate IP addresses, which allows remote authenticated users to cause a denial of service (server crash) via a long IP address.","status":"published","published":"2012-10-22T23:55:07Z","modified":"2026-04-10T03:42:28.557918Z","updated_at":"2026-11-02T15:43:58.537032Z"},{"id":"DEBIAN-CVE-2012-4435","description":"fwknop before 2.0.3 does not properly validate IP addresses, which allows remote authenticated users to cause a denial of service (server crash) via a long IP address.","status":"published","published":"2012-10-22T23:55:07.07Z","modified":"2026-10-23T17:47:40.570274932Z","updated_at":"2026-11-02T15:45:25.218101Z"}]}}