{"schemaVersion":3,"id":"CVE-2021-22890","aliases":["ALPINE-CVE-2021-22890","UBUNTU-CVE-2021-22890","DEBIAN-CVE-2021-22890"],"status":"published","duplicateOf":null,"title":null,"description":"curl 7.63.0 to and including 7.75.0 includes vulnerability that allows a malicious HTTPS proxy to MITM a connection due to bad handling of TLS 1.3 session tickets. When using a HTTPS proxy and TLS 1.3, libcurl can confuse session tickets arriving from the HTTPS proxy but work as if they arrived from the remote server and then wrongly \"short-cut\" the host handshake. When confusing the tickets, a HTTPS proxy can trick libcurl to use the wrong session ticket resume for the host and thereby circumvent the server TLS certificate check and make a MITM attack to be possible to perform unnoticed. Note that such a malicious HTTPS proxy needs to provide a certificate that curl will accept for the MITMed server for an attack to work - unless curl has been told to ignore the server certificate check.","dates":{"published":"2021-04-01T17:46:17.000Z","modified":"2026-10-14T10:15:43.043Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":4.3,"severity":"medium","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":4.3,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Alpine","score":3.7,"severity":"low","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","exploitability":5.6,"impact":2.3,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":4.3,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N","exploitability":7.2,"impact":2.3,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Debian","score":3.7,"severity":"low","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","exploitability":5.6,"impact":2.3,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":3.7,"severity":"low","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","exploitability":null,"impact":null,"computed":false},{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":4.3,"severity":"medium","vector":"AV:N/AC:M/Au:N/C:N/I:P/A:N","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.03057,"percentile":0.87388,"severity":"low","asOf":"2026-10-18T00:00:00.000Z","change":{"pp":-0.08400000000000005,"baselineDate":"2026-09-18T00:00:00.000Z","baselineScore":0.03141},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.03141,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.03141,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.03141,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.03141,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.03141,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.03141,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.03141,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.03141,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.03141,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.03141,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.03141,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.03141,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.03141,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.03141,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.03141,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.03141,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.03141,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.03141,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.03141,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.03141,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.03141,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.03141,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.03141,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.03141,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.03141,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.03141,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.03141,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.02978,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.02978,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.02978,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.02978,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.03057,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.03057,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.03057,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.03057,"percentile":0.87388}],"last30":[{"date":"2026-09-18T00:00:00.000Z","score":0.03141,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.03141,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.03141,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.03141,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.03141,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.03141,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.03141,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.03141,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.03141,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.03141,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.03141,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.03141,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.03141,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.03141,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.03141,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.03141,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.03141,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.03141,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.03141,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.03141,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.03141,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.03141,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.03141,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.02978,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.02978,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.02978,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.02978,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.03057,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.03057,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.03057,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.03057,"percentile":0.87388}]},"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":[{"id":"REF_8323A8A3DA434B10","name":"Exploit Reference (hackerone.com)","source":"reference","url":"https://hackerone.com/reports/1129529","maturity":"unknown","reliabilityScore":0.2,"verified":false,"type":null,"platforms":[],"requiresAuth":null,"exploitdb":null,"metasploit":null}],"exploitCount":1,"weaknesses":[{"id":"CWE-300","name":"Channel Accessible by Non-Endpoint","description":"The product does not adequately verify the identity of actors at both ends of a communication channel, or does not adequately ensure the integrity of the channel, in a way that allows the channel to be accessed or influenced by an actor that is not an endpoint.","type":"weakness","status":"Draft","abstraction":"Class","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/300.html"},{"id":"CWE-290","name":"Authentication Bypass by Spoofing","description":"This attack-focused weakness is caused by incorrectly implemented authentication schemes that are subject to spoofing attacks.","type":"weakness","status":"Incomplete","abstraction":"Base","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/290.html"}],"affected":[{"vendor":"alpine","product":"curl","name":"curl","label":"curl","ecosystem":"Alpine Linux","cpePart":null,"purl":"pkg:apk/alpine/curl","purlType":"apk","versions":[{"text":"< 7.76.0-r0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 7.76.0-r0","eol":null,"hubHref":null},{"vendor":"broadcom","product":"fabric_operating_system","name":"fabric operating system","label":"fabric_operating_system","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"na","noFixRecorded":false,"fixedIn":null}],"versionsText":"na","eol":null,"hubHref":"/vendor/broadcom/fabric_operating_system"},{"vendor":"debian","product":"curl","name":"curl","label":"curl","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/curl","purlType":"deb","versions":[{"text":"< 7.74.0-1.2","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 7.74.0-1.2","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"curl","name":"curl","label":"curl","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/curl","purlType":"deb","versions":[{"text":"< 7.68.0-1ubuntu2.5","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 7.68.0-1ubuntu2.5","eol":null,"hubHref":null},{"vendor":"debian","product":"debian_linux","name":"debian linux","label":"debian_linux","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"9.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"9.0","eol":{"isEol":true,"eolDate":"2022-07-01T00:00:00.000Z","matchMethod":"cpe","cycle":{"name":"9","label":"9 (Stretch)","eolFrom":"2022-07-01T00:00:00.000Z","isLts":false,"isMaintained":true,"latestVersion":"9.13"},"product":{"name":"debian","label":"Debian","category":"os"}},"hubHref":"/vendor/debian/debian_linux"},{"vendor":"fedoraproject","product":"fedora","name":"fedora","label":"fedora","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"32","noFixRecorded":false,"fixedIn":null},{"text":"33","noFixRecorded":false,"fixedIn":null},{"text":"34","noFixRecorded":false,"fixedIn":null}],"versionsText":"32 | 33 | 34","eol":{"isEol":true,"eolDate":"2021-05-25T00:00:00.000Z","matchMethod":"cpe","cycle":{"name":"32","label":"32","eolFrom":"2021-05-25T00:00:00.000Z","isLts":false,"isMaintained":false,"latestVersion":null},"product":{"name":"fedora","label":"Fedora Linux","category":"os"}},"hubHref":"/vendor/fedoraproject/fedora"},{"vendor":"haxx","product":"libcurl","name":"libcurl","label":"libcurl","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 7.63.0, ≤ 7.75.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 7.63.0, ≤ 7.75.0","eol":null,"hubHref":"/vendor/haxx/libcurl"},{"vendor":"netapp","product":"hci_management_node","name":"hci management node","label":"hci_management_node","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"na","noFixRecorded":false,"fixedIn":null}],"versionsText":"na","eol":null,"hubHref":"/vendor/netapp/hci_management_node"},{"vendor":"netapp","product":"hci_storage_node_firmware","name":"hci storage node firmware","label":"hci_storage_node_firmware","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"na","noFixRecorded":false,"fixedIn":null}],"versionsText":"na","eol":null,"hubHref":"/vendor/netapp/hci_storage_node"},{"vendor":"netapp","product":"solidfire","name":"solidfire","label":"solidfire","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"na","noFixRecorded":false,"fixedIn":null}],"versionsText":"na","eol":null,"hubHref":"/vendor/netapp/solidfire"},{"vendor":"oracle","product":"communications_billing_and_revenue_management","name":"communications billing and revenue management","label":"communications_billing_and_revenue_management","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"12.0.0.3.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"12.0.0.3.0","eol":null,"hubHref":"/vendor/oracle/communications_billing_and_revenue_management"},{"vendor":"oracle","product":"essbase","name":"essbase","label":"essbase","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"21.2","noFixRecorded":false,"fixedIn":null}],"versionsText":"21.2","eol":null,"hubHref":"/vendor/oracle/essbase"},{"vendor":"siemens","product":"sinec_infrastructure_network_services","name":"sinec infrastructure network services","label":"sinec_infrastructure_network_services","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 1.0.1.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1.0.1.1","eol":null,"hubHref":"/vendor/siemens/sinec_infrastructure_network_services"},{"vendor":"splunk","product":"universal_forwarder","name":"universal forwarder","label":"universal_forwarder","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 8.2.0, < 8.2.12","noFixRecorded":false,"fixedIn":null},{"text":"≥ 9.0.0, < 9.0.6","noFixRecorded":false,"fixedIn":null},{"text":"9.1.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 8.2.0, < 8.2.12 | ≥ 9.0.0, < 9.0.6 | 9.1.0","eol":null,"hubHref":"/vendor/splunk/universal_forwarder"}],"affectedCount":14,"eol":{"hasEol":true,"count":2},"references":[{"url":"https://hackerone.com/reports/1129529","label":"hackerone.com/reports/1129529","hostname":"hackerone.com","tags":["X Refsource MISC","Exploit","Issue Tracking","Patch","Third Party Advisory"]},{"url":"https://curl.se/docs/CVE-2021-22890.html","label":"curl.se/docs/CVE-2021-22890.html","hostname":"curl.se","tags":["X Refsource MISC","REPORT","Patch","Vendor Advisory"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ITVWPVGLFISU5BJC2BXBRYSDXTXE2YGC/","label":"lists.fedoraproject.org/archives/…","hostname":"lists.fedoraproject.org","tags":["Vendor Advisory","X Refsource FEDORA","Mailing List","Third Party Advisory"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KQUIOYX2KUU6FIUZVB5WWZ6JHSSYSQWJ/","label":"lists.fedoraproject.org/archives/…","hostname":"lists.fedoraproject.org","tags":["Vendor Advisory","X Refsource FEDORA","Mailing List","Third Party Advisory"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2ZC5BMIOKLBQJSFCHEDN2G2C2SH274BP/","label":"lists.fedoraproject.org/archives/…","hostname":"lists.fedoraproject.org","tags":["Vendor Advisory","X Refsource FEDORA","Mailing List","Third Party Advisory"]},{"url":"https://security.gentoo.org/glsa/202105-36","label":"security.gentoo.org/glsa/202105-36","hostname":"security.gentoo.org","tags":["Vendor Advisory","X Refsource GENTOO","Third Party Advisory"]},{"url":"https://www.oracle.com//security-alerts/cpujul2021.html","label":"www.oracle.com//security-alerts/cpujul2021.html","hostname":"www.oracle.com","tags":["X Refsource MISC","Third Party Advisory"]},{"url":"https://security.netapp.com/advisory/ntap-20210521-0007/","label":"security.netapp.com/advisory/ntap-20210521-0007/","hostname":"security.netapp.com","tags":["X Refsource CONFIRM","Third Party Advisory"]},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf","label":"cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf","hostname":"cert-portal.siemens.com","tags":["X Refsource CONFIRM","Patch","Third Party Advisory"]},{"url":"https://security.alpinelinux.org/vuln/CVE-2021-22890","label":"security.alpinelinux.org/vuln/CVE-2021-22890","hostname":"security.alpinelinux.org","tags":["Advisory"]},{"url":"https://ubuntu.com/security/CVE-2021-22890","label":"ubuntu.com/security/CVE-2021-22890","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/notices/USN-4898-1","label":"ubuntu.com/security/notices/USN-4898-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-22890","label":"www.cve.org/CVERecord?id=CVE-2021-22890","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2021-22890","label":"security-tracker.debian.org/tracker/CVE-2021-22890","hostname":"security-tracker.debian.org","tags":["Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-22890","label":"nvd.nist.gov/vuln/detail/CVE-2021-22890","hostname":"nvd.nist.gov","tags":["Oval","Advisory"]},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-389290.html","label":"cert-portal.siemens.com/productcert/html/ssa-389290.html","hostname":"cert-portal.siemens.com","tags":[]},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-398330.html","label":"cert-portal.siemens.com/productcert/html/ssa-398330.html","hostname":"cert-portal.siemens.com","tags":[]}],"lineage":{"upstream":[],"downstream":["DSA-4881-1","MGASA-2021-0186","OPENSUSE-SU-2021:0510-1","OPENSUSE-SU-2024:10582-1","RHSA-2021:2472","SUSE-SU-2021:1006-1","USN-4898-1"],"duplicates":[],"related":["OPENSUSE-SU-2021:0510-1","OPENSUSE-SU-2024:10582-1","SUSE-SU-2021:1006-1","USN-4898-1"]},"timeline":[{"kind":"published","date":"2021-04-01T17:46:17.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-10-14T10:15:43.043Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":28,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-19T05:28:23.753Z","stale":false,"partial":false}}