{"cve":"CVE-2021-22946","nvd":{"published":"2021-09-29T20:15:08.187","modified":"2026-10-14T12:17:08.943","status":"Modified","description":"A user can tell curl >= 7.20.0 and <= 7.78.0 to require a successful upgrade to TLS when speaking to an IMAP, POP3 or FTP server (`--ssl-reqd` on the command line or`CURLOPT_USE_SSL` set to `CURLUSESSL_CONTROL` or `CURLUSESSL_ALL` withlibcurl). This requirement could be bypassed if the server would return a properly crafted but perfectly legitimate response.This flaw would then make curl silently continue its operations **withoutTLS** contrary to the instructions and expectations, exposing possibly sensitive data in clear text over the network.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","score":7.5},"cwes":["CWE-319","CWE-325"],"references":["http://seclists.org/fulldisclosure/2022/Mar/29","https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf","https://hackerone.com/reports/1334111","https://lists.debian.org/debian-lts-announce/2021/09/msg00022.html","https://lists.debian.org/debian-lts-announce/2022/08/msg00017.html"],"products":["apple:macos","debian:debian_linux","fedoraproject:fedora","haxx:curl","netapp:cloud_backup","netapp:clustered_data_ontap","netapp:h300e_firmware","netapp:h300s_firmware","netapp:h410s_firmware","netapp:h500e_firmware","netapp:h500s_firmware","netapp:h700e_firmware","netapp:h700s_firmware","netapp:oncommand_insight","netapp:oncommand_workflow_automation","netapp:snapcenter","netapp:solidfire_baseboard_management_controller_firmware","oracle:commerce_guided_search","oracle:communications_cloud_native_core_binding_support_function","oracle:communications_cloud_native_core_console","oracle:communications_cloud_native_core_network_function_cloud_native_environment","oracle:communications_cloud_native_core_network_repository_function","oracle:communications_cloud_native_core_network_slice_selection_function","oracle:communications_cloud_native_core_security_edge_protection_proxy","oracle:communications_cloud_native_core_service_communication_proxy","oracle:mysql_server","oracle:peoplesoft_enterprise_peopletools","siemens:sinec_infrastructure_network_services","splunk:universal_forwarder"],"source":"nvd","synced_at":"2026-10-19T21:23:41.316049955+00:00"},"epss":{"cve":"CVE-2021-22946","score":0.04539,"percentile":0.91498,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}