{"id":"CVE-2009-0021","aliases":["DEBIAN-CVE-2009-0021","DSA-1702-1","EUVD-2009-0034","GHSA-4q4m-qx69-vcgq","RHSA-2009:0046"],"status":"published","title":"NTP 4.2.4 before 4.2.4p5 and 4.2.5 before 4.2.5p150 does not properly check the return value from...","description":"NTP 4.2.4 before 4.2.4p5 and 4.2.5 before 4.2.5p150 does not properly check the return value from the OpenSSL EVP_VerifyFinal function, which allows remote attackers to bypass validation of the certificate chain via a malformed SSL/TLS signature for DSA and ECDSA keys, a similar vulnerability to CVE-2008-5077.","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":0.03218,"percentile":0.88302,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-287"],"published":"2009-01-07T17:00:00Z","modified":"2026-08-31T06:47:35Z","fixes":[{"ecosystem":"Debian:11","package":"ntp","fixed_in":["1:4.2.4p4+dfsg-8"],"sources":["osv"]},{"ecosystem":"Debian:4.0","package":"ntp","fixed_in":["1:4.2.2.p4+dfsg-2etch1"],"sources":["osv"]},{"ecosystem":"Red Hat:enterprise_linux:4::as","package":"ntp","fixed_in":["0:4.2.0.a.20040617-8.el4_7.1"],"sources":["osv"]},{"ecosystem":"Red Hat:enterprise_linux:4::as","package":"ntp-debuginfo","fixed_in":["0:4.2.0.a.20040617-8.el4_7.1"],"sources":["osv"]},{"ecosystem":"Red Hat:enterprise_linux:4::desktop","package":"ntp","fixed_in":["0:4.2.0.a.20040617-8.el4_7.1"],"sources":["osv"]},{"ecosystem":"Red Hat:enterprise_linux:4::desktop","package":"ntp-debuginfo","fixed_in":["0:4.2.0.a.20040617-8.el4_7.1"],"sources":["osv"]},{"ecosystem":"Red Hat:enterprise_linux:4::es","package":"ntp","fixed_in":["0:4.2.0.a.20040617-8.el4_7.1"],"sources":["osv"]},{"ecosystem":"Red Hat:enterprise_linux:4::es","package":"ntp-debuginfo","fixed_in":["0:4.2.0.a.20040617-8.el4_7.1"],"sources":["osv"]},{"ecosystem":"Red Hat:enterprise_linux:4::ws","package":"ntp","fixed_in":["0:4.2.0.a.20040617-8.el4_7.1"],"sources":["osv"]},{"ecosystem":"Red Hat:enterprise_linux:4::ws","package":"ntp-debuginfo","fixed_in":["0:4.2.0.a.20040617-8.el4_7.1"],"sources":["osv"]},{"ecosystem":"Red Hat:enterprise_linux:5::client","package":"ntp","fixed_in":["0:4.2.2p1-9.el5_3.1"],"sources":["osv"]},{"ecosystem":"Red Hat:enterprise_linux:5::client","package":"ntp-debuginfo","fixed_in":["0:4.2.2p1-9.el5_3.1"],"sources":["osv"]},{"ecosystem":"Red Hat:enterprise_linux:5::server","package":"ntp","fixed_in":["0:4.2.2p1-9.el5_3.1"],"sources":["osv"]},{"ecosystem":"Red Hat:enterprise_linux:5::server","package":"ntp-debuginfo","fixed_in":["0:4.2.2p1-9.el5_3.1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:11","package":"ntp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:4.2.4p4+dfsg-8"}]}]},{"source":"osv","ecosystem":"Debian:4.0","package":"ntp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:4.2.2.p4+dfsg-2etch1"}]}],"versions":["1:4.2.2.p4+dfsg-2"]},{"source":"osv","ecosystem":"Red Hat:enterprise_linux:4::as","package":"ntp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:4.2.0.a.20040617-8.el4_7.1"}]}]},{"source":"osv","ecosystem":"Red Hat:enterprise_linux:4::as","package":"ntp-debuginfo","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:4.2.0.a.20040617-8.el4_7.1"}]}]},{"source":"osv","ecosystem":"Red Hat:enterprise_linux:4::desktop","package":"ntp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:4.2.0.a.20040617-8.el4_7.1"}]}]},{"source":"osv","ecosystem":"Red Hat:enterprise_linux:4::desktop","package":"ntp-debuginfo","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:4.2.0.a.20040617-8.el4_7.1"}]}]},{"source":"osv","ecosystem":"Red Hat:enterprise_linux:4::es","package":"ntp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:4.2.0.a.20040617-8.el4_7.1"}]}]},{"source":"osv","ecosystem":"Red Hat:enterprise_linux:4::es","package":"ntp-debuginfo","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:4.2.0.a.20040617-8.el4_7.1"}]}]},{"source":"osv","ecosystem":"Red Hat:enterprise_linux:4::ws","package":"ntp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:4.2.0.a.20040617-8.el4_7.1"}]}]},{"source":"osv","ecosystem":"Red Hat:enterprise_linux:4::ws","package":"ntp-debuginfo","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:4.2.0.a.20040617-8.el4_7.1"}]}]},{"source":"osv","ecosystem":"Red Hat:enterprise_linux:5::client","package":"ntp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:4.2.2p1-9.el5_3.1"}]}]},{"source":"osv","ecosystem":"Red Hat:enterprise_linux:5::client","package":"ntp-debuginfo","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:4.2.2p1-9.el5_3.1"}]}]},{"source":"osv","ecosystem":"Red Hat:enterprise_linux:5::server","package":"ntp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:4.2.2p1-9.el5_3.1"}]}]},{"source":"osv","ecosystem":"Red Hat:enterprise_linux:5::server","package":"ntp-debuginfo","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:4.2.2p1-9.el5_3.1"}]}]}],"products":[{"vendor":"ntp","product":"ntp"}],"references":[{"url":"http://support.apple.com/kb/HT3549","tags":["x_refsource_CONFIRM","x_transferred","web"]},{"url":"http://www.securityfocus.com/archive/1/499827/100/0/threaded","tags":["mailing-list","x_refsource_BUGTRAQ","x_transferred","web"]},{"url":"http://www.securitytracker.com/id?1021533","tags":["vdb-entry","x_refsource_SECTRACK","x_transferred","web"]},{"url":"https://lists.ntp.org/pipermail/announce/2009-January/000055.html","tags":["mailing-list","x_refsource_MLIST","x_transferred","web"]},{"url":"http://secunia.com/advisories/34642","tags":["third-party-advisory","x_refsource_SECUNIA","x_transferred","Vendor Advisory","advisory"]},{"url":"http://www.redhat.com/support/errata/RHSA-2009-0046.html","tags":["vendor-advisory","x_refsource_REDHAT","x_transferred","web"]},{"url":"http://secunia.com/advisories/35074","tags":["third-party-advisory","x_refsource_SECUNIA","x_transferred","Vendor Advisory","advisory"]},{"url":"http://lists.apple.com/archives/security-announce/2009/May/msg00002.html","tags":["vendor-advisory","x_refsource_APPLE","x_transferred","web"]},{"url":"http://secunia.com/advisories/33558","tags":["third-party-advisory","x_refsource_SECUNIA","x_transferred","Vendor Advisory","advisory"]},{"url":"http://lists.opensuse.org/opensuse-security-announce/2009-03/msg00000.html","tags":["vendor-advisory","x_refsource_SUSE","x_transferred","web"]},{"url":"http://www.ocert.org/advisories/ocert-2008-016.html","tags":["x_refsource_MISC","x_transferred","advisory"]},{"url":"http://slackware.com/security/viewer.php?l=slackware-security\u0026y=2009\u0026m=slackware-security.531177","tags":["vendor-advisory","x_refsource_SLACKWARE","x_transferred","web"]},{"url":"http://lists.opensuse.org/opensuse-security-announce/2009-04/msg00003.html","tags":["vendor-advisory","x_refsource_SUSE","x_transferred","web"]},{"url":"http://secunia.com/advisories/33648","tags":["third-party-advisory","x_refsource_SECUNIA","x_transferred","Vendor Advisory","advisory"]},{"url":"http://secunia.com/advisories/33406","tags":["third-party-advisory","x_refsource_SECUNIA","x_transferred","Vendor Advisory","advisory"]},{"url":"http://www.us-cert.gov/cas/techalerts/TA09-133A.html","tags":["third-party-advisory","x_refsource_CERT","x_transferred","US Government Resource","web"]},{"url":"https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10035","tags":["vdb-entry","signature","x_refsource_OVAL","x_transferred","web"]},{"url":"http://www.vupen.com/english/advisories/2009/1297","tags":["vdb-entry","x_refsource_VUPEN","x_transferred","Vendor Advisory","advisory"]},{"url":"http://www.vupen.com/english/advisories/2009/0042","tags":["vdb-entry","x_refsource_VUPEN","x_transferred","Vendor Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2009-0021","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-4q4m-qx69-vcgq"},{"url":"https://security-tracker.debian.org/tracker/CVE-2009-0021","tags":["advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2009:0046","tags":["advisory"]},{"url":"https://access.redhat.com/security/updates/classification/#moderate","tags":["article"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=476807","tags":["report"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2009/rhsa-2009_0046.json","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2009-0021","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2009-0021","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2009-0021","description":"NTP 4.2.4 before 4.2.4p5 and 4.2.5 before 4.2.5p150 does not properly check the return value from the OpenSSL EVP_VerifyFinal function, which allows remote attackers to bypass validation of the certificate chain via a malformed SSL/TLS signature for DSA and ECDSA keys, a similar vulnerability to CVE-2008-5077.","status":"published","published":"2009-01-07T17:00:00Z","modified":"2024-08-07T04:17:10.427Z","updated_at":"2026-11-02T14:33:26.302774Z"}],"euvd":[{"id":"EUVD-2009-0034","description":"NTP 4.2.4 before 4.2.4p5 and 4.2.5 before 4.2.5p150 does not properly check the return value from the OpenSSL EVP_VerifyFinal function, which allows remote attackers to bypass validation of the certificate chain via a malformed SSL/TLS signature for DSA and ECDSA keys, a similar vulnerability to CVE-2008-5077.","status":"published","published":"2009-01-07T17:00:00Z","modified":"2024-08-07T04:17:10Z","updated_at":"2026-11-03T01:39:28.123124Z"}],"ghsa":[{"id":"GHSA-4q4m-qx69-vcgq","title":"NTP 4.2.4 before 4.2.4p5 and 4.2.5 before 4.2.5p150 does not properly check the return value from...","description":"NTP 4.2.4 before 4.2.4p5 and 4.2.5 before 4.2.5p150 does not properly check the return value from the OpenSSL EVP_VerifyFinal function, which allows remote attackers to bypass validation of the certificate chain via a malformed SSL/TLS signature for DSA and ECDSA keys, a similar vulnerability to CVE-2008-5077.","status":"published","published":"2022-05-02T03:12:27Z","modified":"2023-01-31T05:06:39Z","cwes":["CWE-287"],"updated_at":"2026-11-02T14:49:04.453049Z"}],"nvd":[{"id":"CVE-2009-0021","description":"NTP 4.2.4 before 4.2.4p5 and 4.2.5 before 4.2.5p150 does not properly check the return value from the OpenSSL EVP_VerifyFinal function, which allows remote attackers to bypass validation of the certificate chain via a malformed SSL/TLS signature for DSA and ECDSA keys, a similar vulnerability to CVE-2008-5077.","status":"published","published":"2009-01-07T17:30:00.36Z","modified":"2026-06-16T23:04:05.973Z","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-287"],"updated_at":"2026-11-02T14:01:33.417327Z"}],"osv":[{"id":"CVE-2009-0021","description":"NTP 4.2.4 before 4.2.4p5 and 4.2.5 before 4.2.5p150 does not properly check the return value from the OpenSSL EVP_VerifyFinal function, which allows remote attackers to bypass validation of the certificate chain via a malformed SSL/TLS signature for DSA and ECDSA keys, a similar vulnerability to CVE-2008-5077.","status":"published","published":"2009-01-07T17:30:00Z","modified":"2026-04-10T03:40:33.547451Z","updated_at":"2026-11-02T15:43:57.452479Z"},{"id":"DEBIAN-CVE-2009-0021","description":"NTP 4.2.4 before 4.2.4p5 and 4.2.5 before 4.2.5p150 does not properly check the return value from the OpenSSL EVP_VerifyFinal function, which allows remote attackers to bypass validation of the certificate chain via a malformed SSL/TLS signature for DSA and ECDSA keys, a similar vulnerability to CVE-2008-5077.","status":"published","published":"2009-01-07T17:30:00.36Z","modified":"2026-08-31T06:47:35.77514306Z","updated_at":"2026-11-02T15:45:23.742363Z"},{"id":"DSA-1702-1","title":"ntp - cryptographic weakness","status":"published","published":"2009-01-12T00:00:00Z","modified":"2026-03-09T01:20:02.650788Z","updated_at":"2026-11-02T15:46:14.734124Z"},{"id":"RHSA-2009:0046","title":"Red Hat Security Advisory: ntp security update","status":"published","published":"2024-09-15T17:41:09Z","modified":"2026-06-26T10:10:26Z","updated_at":"2026-11-02T15:53:00.468834Z"}]}}
