{"id":"CVE-2021-22946","title":"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` withli…","summary":"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` withli…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","cwe":["CWE-325","CWE-319","CWE-319"],"vendor":"haxx","product":"curl","affected":["curl >= 7.20.0, < 7.79.0","debian_linux = 9.0","debian_linux = 10.0","debian_linux = 11.0","fedora = 33","fedora = 35","cloud_backup","clustered_data_ontap","oncommand_insight","oncommand_workflow_automation","snapcenter","h300s_firmware","h500s_firmware","h700s_firmware","h300e_firmware","h500e_firmware","h700e_firmware","h410s_firmware","solidfire_baseboard_management_controller_firmware","communications_cloud_native_core_binding_support_function = 1.11.0","communications_cloud_native_core_network_function_cloud_native_environment = 1.10.0","communications_cloud_native_core_network_repository_function = 1.15.0","communications_cloud_native_core_network_repository_function = 1.15.1","communications_cloud_native_core_network_slice_selection_function = 1.8.0","communications_cloud_native_core_service_communication_proxy = 1.15.0","mysql_server >= 5.7.0, <= 5.7.35","mysql_server >= 8.0.0, <= 8.0.26","peoplesoft_enterprise_peopletools = 8.57","peoplesoft_enterprise_peopletools = 8.58","peoplesoft_enterprise_peopletools = 8.59","macos < 12.3","sinec_infrastructure_network_services < 1.0.1.1","commerce_guided_search = 11.3.2","communications_cloud_native_core_binding_support_function = 22.1.3","communications_cloud_native_core_console = 22.2.0","communications_cloud_native_core_network_repository_function = 22.1.0","communications_cloud_native_core_network_repository_function = 22.2.0","communications_cloud_native_core_security_edge_protection_proxy = 22.1.1","universal_forwarder >= 8.2.0, < 8.2.12","universal_forwarder >= 9.0.0, < 9.0.6","universal_forwarder = 9.1.0"],"patched":["curl 7.79.0","macos 12.3","sinec_infrastructure_network_services 1.0.1.1","universal_forwarder 9.0.6"],"published":"2021-09-29","updated":"2026-10-14","sourceUpdated":"2026-10-14T12:17:08.943","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2021-22946","references":[{"url":"http://seclists.org/fulldisclosure/2022/Mar/29","label":"support@hackerone.com"},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf","label":"support@hackerone.com"},{"url":"https://hackerone.com/reports/1334111","label":"support@hackerone.com"},{"url":"https://lists.debian.org/debian-lts-announce/2021/09/msg00022.html","label":"support@hackerone.com"},{"url":"https://lists.debian.org/debian-lts-announce/2022/08/msg00017.html","label":"support@hackerone.com"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/APOAK4X73EJTAPTSVT7IRVDMUWVXNWGD/","label":"support@hackerone.com"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RWLEC6YVEM2HWUBX67SDGPSY4CQB72OE/","label":"support@hackerone.com"},{"url":"https://security.gentoo.org/glsa/202212-01","label":"support@hackerone.com"},{"url":"https://security.netapp.com/advisory/ntap-20211029-0003/","label":"support@hackerone.com"},{"url":"https://security.netapp.com/advisory/ntap-20220121-0008/","label":"support@hackerone.com"},{"url":"https://support.apple.com/kb/HT213183","label":"support@hackerone.com"},{"url":"https://www.debian.org/security/2022/dsa-5197","label":"support@hackerone.com"},{"url":"https://www.oracle.com/security-alerts/cpuapr2022.html","label":"support@hackerone.com"},{"url":"https://www.oracle.com/security-alerts/cpujan2022.html","label":"support@hackerone.com"},{"url":"https://www.oracle.com/security-alerts/cpujul2022.html","label":"support@hackerone.com"},{"url":"https://www.oracle.com/security-alerts/cpuoct2021.html","label":"support@hackerone.com"},{"url":"http://seclists.org/fulldisclosure/2022/Mar/29","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://hackerone.com/reports/1334111","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2021/09/msg00022.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2022/08/msg00017.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/APOAK4X73EJTAPTSVT7IRVDMUWVXNWGD/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RWLEC6YVEM2HWUBX67SDGPSY4CQB72OE/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.gentoo.org/glsa/202212-01","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.netapp.com/advisory/ntap-20211029-0003/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.netapp.com/advisory/ntap-20220121-0008/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://support.apple.com/kb/HT213183","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.debian.org/security/2022/dsa-5197","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.oracle.com/security-alerts/cpuapr2022.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.oracle.com/security-alerts/cpujan2022.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.oracle.com/security-alerts/cpujul2022.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.oracle.com/security-alerts/cpuoct2021.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-146325.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-389290.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-398330.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}],"tags":["nvd"],"epss":0.04539,"epssPercentile":0.91367,"ingestedAt":"2026-10-14T12:29:10.826Z","slug":"CVE-2021-22946","body":"## Overview\n\nA 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.\n\n## Affected\n\n- `curl >= 7.20.0, < 7.79.0`\n- `debian_linux = 9.0`\n- `debian_linux = 10.0`\n- `debian_linux = 11.0`\n- `fedora = 33`\n- `fedora = 35`\n- `cloud_backup`\n- `clustered_data_ontap`\n- `oncommand_insight`\n- `oncommand_workflow_automation`\n- `snapcenter`\n- `h300s_firmware`\n- `h500s_firmware`\n- `h700s_firmware`\n- `h300e_firmware`\n- `h500e_firmware`\n- `h700e_firmware`\n- `h410s_firmware`\n- `solidfire_baseboard_management_controller_firmware`\n- `communications_cloud_native_core_binding_support_function = 1.11.0`\n- `communications_cloud_native_core_network_function_cloud_native_environment = 1.10.0`\n- `communications_cloud_native_core_network_repository_function = 1.15.0`\n- `communications_cloud_native_core_network_repository_function = 1.15.1`\n- `communications_cloud_native_core_network_slice_selection_function = 1.8.0`\n- `communications_cloud_native_core_service_communication_proxy = 1.15.0`\n- `mysql_server >= 5.7.0, <= 5.7.35`\n- `mysql_server >= 8.0.0, <= 8.0.26`\n- `peoplesoft_enterprise_peopletools = 8.57`\n- `peoplesoft_enterprise_peopletools = 8.58`\n- `peoplesoft_enterprise_peopletools = 8.59`\n- `macos < 12.3`\n- `sinec_infrastructure_network_services < 1.0.1.1`\n- `commerce_guided_search = 11.3.2`\n- `communications_cloud_native_core_binding_support_function = 22.1.3`\n- `communications_cloud_native_core_console = 22.2.0`\n- `communications_cloud_native_core_network_repository_function = 22.1.0`\n- `communications_cloud_native_core_network_repository_function = 22.2.0`\n- `communications_cloud_native_core_security_edge_protection_proxy = 22.1.1`\n- `universal_forwarder >= 8.2.0, < 8.2.12`\n- `universal_forwarder >= 9.0.0, < 9.0.6`\n- `universal_forwarder = 9.1.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `curl 7.79.0`\n- `macos 12.3`\n- `sinec_infrastructure_network_services 1.0.1.1`\n- `universal_forwarder 9.0.6`","depth":"twilight","depthScore":42,"depthScoreParts":{"impact":41.3,"likelihood":0.9,"exploitation":0,"ransomware":0},"changes":[]}