{"schemaVersion":3,"id":"CVE-2016-3739","aliases":["DEBIAN-CVE-2016-3739"],"status":"published","duplicateOf":null,"title":null,"description":"The (1) mbed_connect_step1 function in lib/vtls/mbedtls.c and (2) polarssl_connect_step1 function in lib/vtls/polarssl.c in cURL and libcurl before 7.49.0, when using SSLv3 or making a TLS connection to a URL that uses a numerical IP address, allow remote attackers to spoof servers via an arbitrary valid certificate.","dates":{"published":"2016-05-20T00:00:00.000Z","modified":"2024-08-06T00:03:34.619Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":5.3,"severity":"medium","version":"3.0","versionLabel":"v3.0","source":"NVD","vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.0","versionLabel":"v3.0","source":"NVD","score":5.3,"severity":"medium","vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N","exploitability":null,"impact":null,"computed":false},{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":2.6,"severity":"low","vector":"AV:N/AC:H/Au:N/C:N/I:P/A:N","exploitability":null,"impact":null,"computed":false},{"version":"3.0","versionLabel":"v3.0","source":"OSV · Debian","score":5.3,"severity":"medium","vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N","exploitability":4.1,"impact":6,"computed":true}]},"epss":{"probability":0.06925,"percentile":0.94032,"severity":"low","asOf":"2026-10-18T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-18T00:00:00.000Z","baselineScore":0.06925},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.07281,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.06925,"percentile":0.94032}],"last30":[{"date":"2026-09-18T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.07281,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.06925,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.06925,"percentile":0.94032}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-20","name":"Improper Input Validation","description":"The product receives input or data, but it does\n        not validate or incorrectly validates that the input has the\n        properties that are required to process the data safely and\n        correctly.","type":"weakness","status":"Stable","abstraction":"Class","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/20.html"}],"affected":[{"vendor":"debian","product":"curl","name":"curl","label":"curl","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/curl","purlType":"deb","versions":[{"text":"< 7.50.1-1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 7.50.1-1","eol":null,"hubHref":null},{"vendor":"haxx","product":"curl","name":"curl","label":"curl","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"7.21.0","noFixRecorded":false,"fixedIn":null},{"text":"7.21.1","noFixRecorded":false,"fixedIn":null},{"text":"7.21.2","noFixRecorded":false,"fixedIn":null},{"text":"7.21.3","noFixRecorded":false,"fixedIn":null},{"text":"7.21.4","noFixRecorded":false,"fixedIn":null},{"text":"7.21.5","noFixRecorded":false,"fixedIn":null},{"text":"7.21.6","noFixRecorded":false,"fixedIn":null},{"text":"7.21.7","noFixRecorded":false,"fixedIn":null},{"text":"7.22.0","noFixRecorded":false,"fixedIn":null},{"text":"7.23.0","noFixRecorded":false,"fixedIn":null},{"text":"7.23.1","noFixRecorded":false,"fixedIn":null},{"text":"7.24.0","noFixRecorded":false,"fixedIn":null},{"text":"7.25.0","noFixRecorded":false,"fixedIn":null},{"text":"7.26.0","noFixRecorded":false,"fixedIn":null},{"text":"7.27.0","noFixRecorded":false,"fixedIn":null},{"text":"7.28.0","noFixRecorded":false,"fixedIn":null},{"text":"7.28.1","noFixRecorded":false,"fixedIn":null},{"text":"7.29.0","noFixRecorded":false,"fixedIn":null},{"text":"7.30.0","noFixRecorded":false,"fixedIn":null},{"text":"7.31.0","noFixRecorded":false,"fixedIn":null},{"text":"7.32.0","noFixRecorded":false,"fixedIn":null},{"text":"7.33.0","noFixRecorded":false,"fixedIn":null},{"text":"7.34.0","noFixRecorded":false,"fixedIn":null},{"text":"7.35.0","noFixRecorded":false,"fixedIn":null},{"text":"7.36.0","noFixRecorded":false,"fixedIn":null},{"text":"7.38.0","noFixRecorded":false,"fixedIn":null},{"text":"7.39.0","noFixRecorded":false,"fixedIn":null},{"text":"7.40.0","noFixRecorded":false,"fixedIn":null},{"text":"7.41.0","noFixRecorded":false,"fixedIn":null},{"text":"7.42.0","noFixRecorded":false,"fixedIn":null},{"text":"7.42.1","noFixRecorded":false,"fixedIn":null},{"text":"7.43.0","noFixRecorded":false,"fixedIn":null},{"text":"7.44.0","noFixRecorded":false,"fixedIn":null},{"text":"7.45.0","noFixRecorded":false,"fixedIn":null},{"text":"7.46.0","noFixRecorded":false,"fixedIn":null},{"text":"7.47.0","noFixRecorded":false,"fixedIn":null},{"text":"7.48.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"7.21.0 | 7.21.1 | 7.21.2 | 7.21.3 | 7.21.4 | 7.21.5 | 7.21.6 | 7.21.7 | 7.22.0 | 7.23.0 | 7.23.1 | 7.24.0 | 7.25.0 | 7.26.0 | 7.27.0 | 7.28.0 | 7.28.1 | 7.29.0 | 7.30.0 | 7.31.0 | 7.32.0 | 7.33.0 | 7.34.0 | 7.35.0 | 7.36.0 | 7.38.0 | 7.39.0 | 7.40.0 | 7.41.0 | 7.42.0 | 7.42.1 | 7.43.0 | 7.44.0 | 7.45.0 | 7.46.0 | 7.47.0 | 7.48.0","eol":null,"hubHref":"/vendor/haxx/curl"}],"affectedCount":2,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05320149","label":"h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05320149","hostname":"h20566.www2.hpe.com","tags":[]},{"url":"http://www.securitytracker.com/id/1035907","label":"www.securitytracker.com/id/1035907","hostname":"www.securitytracker.com","tags":["VDB Entry"]},{"url":"https://curl.haxx.se/docs/adv_20160518.html","label":"curl.haxx.se/docs/adv_20160518.html","hostname":"curl.haxx.se","tags":["Vendor Advisory"]},{"url":"http://www.slackware.com/security/viewer.php?l=slackware-security&y=2016&m=slackware-security.495349","label":"www.slackware.com/security/viewer.php?l=slackware-security&y=2016&m=slackware-security.495349","hostname":"www.slackware.com","tags":["Vendor Advisory"]},{"url":"http://www.securityfocus.com/bid/90726","label":"www.securityfocus.com/bid/90726","hostname":"www.securityfocus.com","tags":["VDB Entry"]},{"url":"https://curl.haxx.se/CVE-2016-3739.patch","label":"curl.haxx.se/CVE-2016-3739.patch","hostname":"curl.haxx.se","tags":["Vendor Advisory"]},{"url":"https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05390722","label":"h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05390722","hostname":"h20566.www2.hpe.com","tags":[]},{"url":"http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html","label":"www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html","hostname":"www.oracle.com","tags":[]},{"url":"https://security.gentoo.org/glsa/201701-47","label":"security.gentoo.org/glsa/201701-47","hostname":"security.gentoo.org","tags":["Vendor Advisory"]},{"url":"https://curl.haxx.se/changes.html#7_49_0","label":"curl.haxx.se/changes.html","hostname":"curl.haxx.se","tags":[]},{"url":"http://www.openwall.com/lists/oss-security/2024/03/27/4","label":"www.openwall.com/lists/oss-security/2024/03/27/4","hostname":"www.openwall.com","tags":["Mailing List"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2016-3739","label":"security-tracker.debian.org/tracker/CVE-2016-3739","hostname":"security-tracker.debian.org","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2016-05-20T00:00:00.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2024-08-06T00:03:34.619Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":23,"level":"low","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-19T09:56:32.697Z","stale":false,"partial":false}}