--- 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' --- ## Overview 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. ## 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` ## Remediation Upgrade past the affected range: - `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`