{"cve":"CVE-2021-22924","nvd":{"published":"2021-08-05T21:15:11.380","modified":"2026-10-14T11:16:53.787","status":"Modified","description":"libcurl keeps previously used connections in a connection pool for subsequenttransfers to reuse, if one of them matches the setup.Due to errors in the logic, the config matching function did not take 'issuercert' into account and it compared the involved paths *case insensitively*,which could lead to libcurl reusing wrong connections.File paths are, or can be, case sensitive on many systems but not all, and caneven vary depending on used file systems.The comparison also didn't include the 'issuer cert' which a transfer can setto qualify how to verify the server certificate.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N","score":3.7},"cwes":["CWE-706","CWE-20"],"references":["https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf","https://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdf","https://cert-portal.siemens.com/productcert/pdf/ssa-732250.pdf","https://hackerone.com/reports/1223565","https://lists.apache.org/thread.html/r61db8e7dcb56dc000a5387a88f7a473bacec5ee01b9ff3f55308aacc%40%3Cdev.kafka.apache.org%3E"],"products":["debian:debian_linux","fedoraproject:fedora","haxx:libcurl","netapp:cloud_backup","netapp:clustered_data_ontap","netapp:solidfire_\\&_hci_management_node","netapp:solidfire_baseboard_management_controller_firmware","oracle:mysql_server","oracle:peoplesoft_enterprise_peopletools","siemens:logo\\!_cmr2020_firmware","siemens:logo\\!_cmr2040_firmware","siemens:ruggedcomrm_1224_lte_firmware","siemens:scalance_m804pb_firmware","siemens:scalance_m812-1_firmware","siemens:scalance_m816-1_firmware","siemens:scalance_m826-2_firmware","siemens:scalance_m874-2_firmware","siemens:scalance_m874-3_firmware","siemens:scalance_m876-3_firmware","siemens:scalance_m876-4_firmware","siemens:scalance_mum856-1_firmware","siemens:scalance_s615_firmware","siemens:simatic_cp_1543-1_firmware","siemens:simatic_cp_1545-1_firmware","siemens:simatic_rtu3010c_firmware","siemens:simatic_rtu3030c_firmware","siemens:simatic_rtu3031c_firmware","siemens:simatic_rtu_3041c_firmware","siemens:sinec_infrastructure_network_services","siemens:sinema_remote_connect","siemens:sinema_remote_connect_server","siemens:siplus_net_cp_1543-1_firmware","splunk:universal_forwarder"],"source":"nvd","synced_at":"2026-10-19T21:21:13.713336758+00:00"},"epss":{"cve":"CVE-2021-22924","score":0.0627,"percentile":0.93525,"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."]}