curl 7.75.0 through 7.76.1 suffers from a use-after-free vulnerability resulting in already freed memory being used when a TLS 1.3 session ticket arrives over a connection. A malicious server can use this in rare unfortunate circumstances to potentially reach remote code execution in the client. When libcurl at run-time sets up support for TLS 1.3 session tickets on a connection using OpenSSL, it stores pointers to the transfer in-memory object for later retrieval when a session ticket arrives. If the connection is used by multiple transfers (like with a reused HTTP/1.1 connection or multiplexed HTTP/2 connection) that first transfer object might be freed before the new session is established on that connection and then the function will access a memory buffer that might be freed. When using that memory, libcurl might even call a function pointer in the object, making it possible for a remote code execution if the server could somehow manage to get crafted memory content into the correct place in memory.
Fix
Patch, vendor advisory and mitigation references on NVD 12
- https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf Patch, Third Party Advisory
- https://curl.se/docs/CVE-2021-22901.html Exploit, Patch, Vendor Advisory
- https://github.com/curl/curl/commit/7f4a9a9b2a49547eae24d2e19bc5c346e9026479 Patch, Third Party Advisory
- https://www.oracle.com//security-alerts/cpujul2021.html Patch, Third Party Advisory
- https://www.oracle.com/security-alerts/cpuapr2022.html Patch, Third Party Advisory
- https://www.oracle.com/security-alerts/cpujan2022.html Patch, Third Party Advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf Patch, Third Party Advisory
- https://curl.se/docs/CVE-2021-22901.html Exploit, Patch, Vendor Advisory
- https://github.com/curl/curl/commit/7f4a9a9b2a49547eae24d2e19bc5c346e9026479 Patch, Third Party Advisory
- https://www.oracle.com//security-alerts/cpujul2021.html Patch, Third Party Advisory
- https://www.oracle.com/security-alerts/cpuapr2022.html Patch, Third Party Advisory
- https://www.oracle.com/security-alerts/cpujan2022.html Patch, Third Party Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 8.1 · haxx, oracle, netappNVD modified 2026-10-14 11:16
Affected (CPE criteria) 29
cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*cpe:2.3:a:oracle:communications_cloud_native_core_binding_support_function:1.11.0:*:*:*:*:*:*:*cpe:2.3:a:oracle:communications_cloud_native_core_network_function_cloud_native_environment:1.10.0:*:*:*:*:*:*:*cpe:2.3:a:oracle:communications_cloud_native_core_network_repository_function:1.15.0:*:*:*:*:*:*:*cpe:2.3:a:oracle:communications_cloud_native_core_network_repository_function:1.15.1:*:*:*:*:*:*:*cpe:2.3:a:oracle:communications_cloud_native_core_network_slice_selection_function:1.8.0:*:*:*:*:*:*:*cpe:2.3:a:oracle:communications_cloud_native_core_service_communication_proxy:1.15.0:*:*:*:*:*:*:*cpe:2.3:a:oracle:essbase:*:*:*:*:*:*:*:*cpe:2.3:a:oracle:mysql_server:*:*:*:*:*:*:*:*cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:vsphere:*:*cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:windows:*:*cpe:2.3:a:netapp:cloud_backup:-:*:*:*:*:*:*:*cpe:2.3:a:netapp:oncommand_insight:-:*:*:*:*:*:*:*cpe:2.3:a:netapp:oncommand_workflow_automation:-:*:*:*:*:*:*:*cpe:2.3:a:netapp:snapcenter:-:*:*:*:*:*:*:*cpe:2.3:a:netapp:solidfire\,_enterprise_sds_\&_hci_storage_node:-:*:*:*:*:*:*:*cpe:2.3:a:netapp:solidfire_\&_hci_management_node:-:*:*:*:*:*:*:*cpe:2.3:o:netapp:solidfire_baseboard_management_controller_firmware:-:*:*:*:*:*:*:*cpe:2.3:o:netapp:hci_compute_node_firmware:-:*:*:*:*:*:*:*cpe:2.3:o:netapp:h300e_firmware:-:*:*:*:*:*:*:*cpe:2.3:o:netapp:h300s_firmware:-:*:*:*:*:*:*:*cpe:2.3:o:netapp:h410s_firmware:-:*:*:*:*:*:*:*cpe:2.3:o:netapp:h500e_firmware:-:*:*:*:*:*:*:*cpe:2.3:o:netapp:h500s_firmware:-:*:*:*:*:*:*:*cpe:2.3:o:netapp:h700e_firmware:-:*:*:*:*:*:*:*cpe:2.3:o:netapp:h700s_firmware:-:*:*:*:*:*:*:*cpe:2.3:a:siemens:sinec_infrastructure_network_services:*:*:*:*:*:*:*:*cpe:2.3:a:splunk:universal_forwarder:*:*:*:*:*:*:*:*cpe:2.3:a:splunk:universal_forwarder:9.1.0:*:*:*:*:*:*:*
References 23
- https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf Patch, Third Party Advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-732250.pdf Third Party Advisory
- https://curl.se/docs/CVE-2021-22901.html Exploit, Patch, Vendor Advisory
- https://github.com/curl/curl/commit/7f4a9a9b2a49547eae24d2e19bc5c346e9026479 Patch, Third Party Advisory
- https://hackerone.com/reports/1180380 Exploit, Issue Tracking, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210723-0001/ Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210727-0007/ Third Party Advisory
- https://www.oracle.com//security-alerts/cpujul2021.html Patch, Third Party Advisory
- https://www.oracle.com/security-alerts/cpuapr2022.html Patch, Third Party Advisory
- https://www.oracle.com/security-alerts/cpujan2022.html Patch, Third Party Advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf Patch, Third Party Advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-732250.pdf Third Party Advisory
- https://curl.se/docs/CVE-2021-22901.html Exploit, Patch, Vendor Advisory
- https://github.com/curl/curl/commit/7f4a9a9b2a49547eae24d2e19bc5c346e9026479 Patch, Third Party Advisory
- https://hackerone.com/reports/1180380 Exploit, Issue Tracking, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210723-0001/ Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210727-0007/ Third Party Advisory
- https://www.oracle.com//security-alerts/cpujul2021.html Patch, Third Party Advisory
- https://www.oracle.com/security-alerts/cpuapr2022.html Patch, Third Party Advisory
- https://www.oracle.com/security-alerts/cpujan2022.html Patch, Third Party Advisory
- https://cert-portal.siemens.com/productcert/html/ssa-389290.html
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html
- https://cert-portal.siemens.com/productcert/html/ssa-732250.html