{"id":"CVE-2021-22924","title":"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 comp…","summary":"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 comp…","severity":"low","cvss":3.7,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N","cwe":["CWE-20","CWE-706"],"vendor":"haxx","product":"libcurl","affected":["libcurl >= 7.10.4, < 7.77.0","fedora = 33","debian_linux = 9.0","debian_linux = 10.0","debian_linux = 11.0","cloud_backup","clustered_data_ontap","solidfire_&_hci_management_node","solidfire_baseboard_management_controller_firmware","mysql_server >= 5.7.0, <= 5.7.36","mysql_server >= 8.0.0, <= 8.0.26","peoplesoft_enterprise_peopletools = 8.57","peoplesoft_enterprise_peopletools = 8.58","peoplesoft_enterprise_peopletools = 8.59","sinec_infrastructure_network_services < 1.0.1.1","sinema_remote_connect_server < 3.1","logo!_cmr2040_firmware","logo!_cmr2020_firmware","ruggedcomrm_1224_lte_firmware < 7.1","scalance_m804pb_firmware < 7.1","scalance_m812-1_firmware < 7.1","scalance_m816-1_firmware < 7.1","scalance_m826-2_firmware < 7.1","scalance_m874-2_firmware < 7.1","scalance_m874-3_firmware < 7.1","scalance_m876-3_firmware < 7.1","scalance_m876-4_firmware < 7.1","scalance_mum856-1_firmware < 7.1","scalance_s615_firmware < 7.1","simatic_cp_1543-1_firmware < 3.0.22","simatic_cp_1545-1_firmware < 1.1","simatic_rtu3010c_firmware < 5.0.14","simatic_rtu3030c_firmware < 5.0.14","simatic_rtu3031c_firmware < 5.0.14","simatic_rtu_3041c_firmware < 5.0.14","sinema_remote_connect < 3.1","siplus_net_cp_1543-1_firmware < 3.0.22","universal_forwarder >= 8.2.0, < 8.2.12","universal_forwarder >= 9.0.0, < 9.0.6","universal_forwarder = 9.1.0"],"patched":["libcurl 7.77.0","sinec_infrastructure_network_services 1.0.1.1","sinema_remote_connect_server 3.1","ruggedcomrm_1224_lte_firmware 7.1","scalance_m804pb_firmware 7.1","scalance_m812-1_firmware 7.1","scalance_m816-1_firmware 7.1","scalance_m826-2_firmware 7.1","scalance_m874-2_firmware 7.1","scalance_m874-3_firmware 7.1","scalance_m876-3_firmware 7.1","scalance_m876-4_firmware 7.1","scalance_mum856-1_firmware 7.1","scalance_s615_firmware 7.1","simatic_cp_1543-1_firmware 3.0.22","simatic_cp_1545-1_firmware 1.1","simatic_rtu3010c_firmware 5.0.14","simatic_rtu3030c_firmware 5.0.14","simatic_rtu3031c_firmware 5.0.14","simatic_rtu_3041c_firmware 5.0.14","sinema_remote_connect 3.1","siplus_net_cp_1543-1_firmware 3.0.22","universal_forwarder 9.0.6"],"published":"2021-08-05","updated":"2026-10-14","sourceUpdated":"2026-10-14T11:16:53.787","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2021-22924","references":[{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf","label":"support@hackerone.com"},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdf","label":"support@hackerone.com"},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-732250.pdf","label":"support@hackerone.com"},{"url":"https://hackerone.com/reports/1223565","label":"support@hackerone.com"},{"url":"https://lists.apache.org/thread.html/r61db8e7dcb56dc000a5387a88f7a473bacec5ee01b9ff3f55308aacc%40%3Cdev.kafka.apache.org%3E","label":"support@hackerone.com"},{"url":"https://lists.apache.org/thread.html/r61db8e7dcb56dc000a5387a88f7a473bacec5ee01b9ff3f55308aacc%40%3Cusers.kafka.apache.org%3E","label":"support@hackerone.com"},{"url":"https://lists.apache.org/thread.html/rbf4ce74b0d1fa9810dec50ba3ace0caeea677af7c27a97111c06ccb7%40%3Cdev.kafka.apache.org%3E","label":"support@hackerone.com"},{"url":"https://lists.apache.org/thread.html/rbf4ce74b0d1fa9810dec50ba3ace0caeea677af7c27a97111c06ccb7%40%3Cusers.kafka.apache.org%3E","label":"support@hackerone.com"},{"url":"https://lists.debian.org/debian-lts-announce/2021/08/msg00017.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/FRUCW2UVNYUDZF72DQLFQR4PJEC6CF7V/","label":"support@hackerone.com"},{"url":"https://security.netapp.com/advisory/ntap-20210902-0003/","label":"support@hackerone.com"},{"url":"https://www.debian.org/security/2022/dsa-5197","label":"support@hackerone.com"},{"url":"https://www.oracle.com/security-alerts/cpujan2022.html","label":"support@hackerone.com"},{"url":"https://www.oracle.com/security-alerts/cpuoct2021.html","label":"support@hackerone.com"},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdf","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-732250.pdf","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://hackerone.com/reports/1223565","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.apache.org/thread.html/r61db8e7dcb56dc000a5387a88f7a473bacec5ee01b9ff3f55308aacc%40%3Cdev.kafka.apache.org%3E","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.apache.org/thread.html/r61db8e7dcb56dc000a5387a88f7a473bacec5ee01b9ff3f55308aacc%40%3Cusers.kafka.apache.org%3E","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.apache.org/thread.html/rbf4ce74b0d1fa9810dec50ba3ace0caeea677af7c27a97111c06ccb7%40%3Cdev.kafka.apache.org%3E","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.apache.org/thread.html/rbf4ce74b0d1fa9810dec50ba3ace0caeea677af7c27a97111c06ccb7%40%3Cusers.kafka.apache.org%3E","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2021/08/msg00017.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/FRUCW2UVNYUDZF72DQLFQR4PJEC6CF7V/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.netapp.com/advisory/ntap-20210902-0003/","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/cpujan2022.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-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"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-484086.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-732250.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}],"tags":["nvd","exploit-available"],"epss":0.0627,"epssPercentile":0.93431,"exploits":{"github":1,"githubRepos":["https://github.com/Trinadh465/external_curl_AOSP10_r33_CVE-2021-22924"],"checkedAt":"2026-10-14T11:27:56.635Z"},"exploitAvailable":true,"ingestedAt":"2026-10-14T11:27:22.126Z","slug":"CVE-2021-22924","body":"## Overview\n\nlibcurl 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.\n\n## Affected\n\n- `libcurl >= 7.10.4, < 7.77.0`\n- `fedora = 33`\n- `debian_linux = 9.0`\n- `debian_linux = 10.0`\n- `debian_linux = 11.0`\n- `cloud_backup`\n- `clustered_data_ontap`\n- `solidfire_&_hci_management_node`\n- `solidfire_baseboard_management_controller_firmware`\n- `mysql_server >= 5.7.0, <= 5.7.36`\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- `sinec_infrastructure_network_services < 1.0.1.1`\n- `sinema_remote_connect_server < 3.1`\n- `logo!_cmr2040_firmware`\n- `logo!_cmr2020_firmware`\n- `ruggedcomrm_1224_lte_firmware < 7.1`\n- `scalance_m804pb_firmware < 7.1`\n- `scalance_m812-1_firmware < 7.1`\n- `scalance_m816-1_firmware < 7.1`\n- `scalance_m826-2_firmware < 7.1`\n- `scalance_m874-2_firmware < 7.1`\n- `scalance_m874-3_firmware < 7.1`\n- `scalance_m876-3_firmware < 7.1`\n- `scalance_m876-4_firmware < 7.1`\n- `scalance_mum856-1_firmware < 7.1`\n- `scalance_s615_firmware < 7.1`\n- `simatic_cp_1543-1_firmware < 3.0.22`\n- `simatic_cp_1545-1_firmware < 1.1`\n- `simatic_rtu3010c_firmware < 5.0.14`\n- `simatic_rtu3030c_firmware < 5.0.14`\n- `simatic_rtu3031c_firmware < 5.0.14`\n- `simatic_rtu_3041c_firmware < 5.0.14`\n- `sinema_remote_connect < 3.1`\n- `siplus_net_cp_1543-1_firmware < 3.0.22`\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- `libcurl 7.77.0`\n- `sinec_infrastructure_network_services 1.0.1.1`\n- `sinema_remote_connect_server 3.1`\n- `ruggedcomrm_1224_lte_firmware 7.1`\n- `scalance_m804pb_firmware 7.1`\n- `scalance_m812-1_firmware 7.1`\n- `scalance_m816-1_firmware 7.1`\n- `scalance_m826-2_firmware 7.1`\n- `scalance_m874-2_firmware 7.1`\n- `scalance_m874-3_firmware 7.1`\n- `scalance_m876-3_firmware 7.1`\n- `scalance_m876-4_firmware 7.1`\n- `scalance_mum856-1_firmware 7.1`\n- `scalance_s615_firmware 7.1`\n- `simatic_cp_1543-1_firmware 3.0.22`\n- `simatic_cp_1545-1_firmware 1.1`\n- `simatic_rtu3010c_firmware 5.0.14`\n- `simatic_rtu3030c_firmware 5.0.14`\n- `simatic_rtu3031c_firmware 5.0.14`\n- `simatic_rtu_3041c_firmware 5.0.14`\n- `sinema_remote_connect 3.1`\n- `siplus_net_cp_1543-1_firmware 3.0.22`\n- `universal_forwarder 9.0.6`","depth":"twilight","depthScore":34,"depthScoreParts":{"impact":20.4,"likelihood":1.3,"exploitation":12,"ransomware":0},"changes":[]}