{"cve":{"cve_id":"CVE-2021-22890","is_kev":false,"kev_date_added":null,"kev_vendor_project":null,"kev_product":null,"kev_vulnerability_name":null,"kev_short_description":null,"kev_required_action":null,"kev_due_date":null,"kev_known_ransomware":null,"kev_notes":null,"kev_cwes":null,"epss_score":0.03057,"epss_percentile":0.87361,"epss_as_of":"2026-10-15","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.","published_at":"2021-04-01T17:46:17Z","last_modified_at":"2026-10-14T11:16:52.373000Z","cvss_v3_score":4.3,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N","cvss_v3_severity":"MEDIUM","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":"poc","ssvc_automatable":false,"ssvc_technical_impact":"partial","cwes":["CWE-300"],"nvd_references":["https://hackerone.com/reports/1129529","https://curl.se/docs/CVE-2021-22890.html","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ITVWPVGLFISU5BJC2BXBRYSDXTXE2YGC/","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KQUIOYX2KUU6FIUZVB5WWZ6JHSSYSQWJ/","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2ZC5BMIOKLBQJSFCHEDN2G2C2SH274BP/","https://security.gentoo.org/glsa/202105-36","https://www.oracle.com//security-alerts/cpujul2021.html","https://security.netapp.com/advisory/ntap-20210521-0007/","https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf"],"vuln_status":"Modified","trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-06-24T00:09:39.878444Z","updated_at":"2026-10-14T23:59:09.254433Z"},"effective_severity":"MEDIUM","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"PR","name":"Privileges Required","value":"N","value_label":"None"},{"metric":"UI","name":"User Interaction","value":"R","value_label":"Required"},{"metric":"S","name":"Scope","value":"U","value_label":"Unchanged"},{"metric":"C","name":"Confidentiality","value":"N","value_label":"None"},{"metric":"I","name":"Integrity","value":"L","value_label":"Low"},{"metric":"A","name":"Availability","value":"N","value_label":"None"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"broadcom","vendor_name":"Broadcom","product_slug":"fabric-operating-system","product_name":"fabric_operating_system","version_start":null,"version_start_inclusive":null,"version_end":null,"version_end_inclusive":null,"cpe23_uri":"cpe:2.3:o:broadcom:fabric_operating_system:-:*:*:*:*:*:*:*"},{"vendor_slug":"debian","vendor_name":"Debian","product_slug":"debian-linux","product_name":"debian_linux","version_start":"9.0","version_start_inclusive":true,"version_end":"9.0","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*"},{"vendor_slug":"fedoraproject","vendor_name":"fedoraproject","product_slug":"fedora","product_name":"fedora","version_start":"32","version_start_inclusive":true,"version_end":"32","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*"},{"vendor_slug":"fedoraproject","vendor_name":"fedoraproject","product_slug":"fedora","product_name":"fedora","version_start":"33","version_start_inclusive":true,"version_end":"33","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*"},{"vendor_slug":"fedoraproject","vendor_name":"fedoraproject","product_slug":"fedora","product_name":"fedora","version_start":"34","version_start_inclusive":true,"version_end":"34","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*"},{"vendor_slug":"haxx","vendor_name":"haxx","product_slug":"libcurl","product_name":"libcurl","version_start":"7.63.0","version_start_inclusive":true,"version_end":"7.75.0","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:haxx:libcurl:*:*:*:*:*:*:*:*"},{"vendor_slug":"netapp","vendor_name":"NetApp","product_slug":"hci-management-node","product_name":"hci_management_node","version_start":null,"version_start_inclusive":null,"version_end":null,"version_end_inclusive":null,"cpe23_uri":"cpe:2.3:a:netapp:hci_management_node:-:*:*:*:*:*:*:*"},{"vendor_slug":"netapp","vendor_name":"NetApp","product_slug":"hci-storage-node","product_name":"hci_storage_node","version_start":null,"version_start_inclusive":null,"version_end":null,"version_end_inclusive":null,"cpe23_uri":"cpe:2.3:h:netapp:hci_storage_node:-:*:*:*:*:*:*:*"},{"vendor_slug":"netapp","vendor_name":"NetApp","product_slug":"solidfire","product_name":"solidfire","version_start":null,"version_start_inclusive":null,"version_end":null,"version_end_inclusive":null,"cpe23_uri":"cpe:2.3:a:netapp:solidfire:-:*:*:*:*:*:*:*"},{"vendor_slug":"oracle","vendor_name":"oracle","product_slug":"communications-billing-and-revenue-management","product_name":"communications_billing_and_revenue_management","version_start":"12.0.0.3.0","version_start_inclusive":true,"version_end":"12.0.0.3.0","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:oracle:communications_billing_and_revenue_management:12.0.0.3.0:*:*:*:*:*:*:*"},{"vendor_slug":"oracle","vendor_name":"oracle","product_slug":"essbase","product_name":"essbase","version_start":"21.2","version_start_inclusive":true,"version_end":"21.2","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:oracle:essbase:21.2:*:*:*:*:*:*:*"},{"vendor_slug":"siemens","vendor_name":"Siemens","product_slug":"sinec-infrastructure-network-services","product_name":"sinec_infrastructure_network_services","version_start":null,"version_start_inclusive":null,"version_end":"1.0.1.1","version_end_inclusive":false,"cpe23_uri":"cpe:2.3:a:siemens:sinec_infrastructure_network_services:*:*:*:*:*:*:*:*"},{"vendor_slug":"splunk","vendor_name":"Splunk","product_slug":"universal-forwarder","product_name":"Universal 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