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CVE-2021-22947

5.9 medium SSVC exploitation: poc Modified
NVD · CVE.org

When curl >= 7.20.0 and <= 7.78.0 connects to an IMAP or POP3 server to retrieve data using STARTTLS to upgrade to TLS security, the server can respond and send back multiple responses at once that curl caches. curl would then upgrade to TLS but not flush the in-queue of cached responses but instead continue using and trustingthe responses it got *before* the TLS handshake as if they were authenticated.Using this flaw, it allows a Man-In-The-Middle attacker to first inject the fake responses, then pass-through the TLS traffic from the legitimate server and trick curl into sending data back to the user thinking the attacker's injected data comes from the TLS-protected server.

Fix

Patch, vendor advisory and mitigation references on NVD 10

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 5.9 · haxx, fedoraproject, debianNVD modified 2026-10-14 12:17

Affected (CPE criteria) 36

  • cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*
  • cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
  • cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*
  • cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
  • cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
  • cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
  • cpe:2.3:a:netapp:cloud_backup:-:*:*:*:*:*:*:*
  • cpe:2.3:a:netapp:clustered_data_ontap:-:*:*:*:*:*:*:*
  • cpe:2.3:o:netapp:h300s_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:o:netapp:h500s_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:o:netapp:h700s_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:o:netapp:h300e_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:o:netapp:h500e_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:o:netapp:h700e_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:o:netapp:h410s_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:o:netapp:solidfire_baseboard_management_controller_firmware:-:*:*:*:*:*:*:*
  • 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:mysql_server:*:*:*:*:*:*:*:*
  • cpe:2.3:a:oracle:peoplesoft_enterprise_peopletools:8.57:*:*:*:*:*:*:*
  • cpe:2.3:a:oracle:peoplesoft_enterprise_peopletools:8.58:*:*:*:*:*:*:*
  • cpe:2.3:a:oracle:peoplesoft_enterprise_peopletools:8.59:*:*:*:*:*:*:*
  • cpe:2.3:a:siemens:sinec_infrastructure_network_services:*:*:*:*:*:*:*:*
  • cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:*
  • cpe:2.3:a:oracle:commerce_guided_search:11.3.2:*:*:*:*:*:*:*
  • cpe:2.3:a:oracle:communications_cloud_native_core_binding_support_function:22.1.3:*:*:*:*:*:*:*
  • cpe:2.3:a:oracle:communications_cloud_native_core_console:22.2.0:*:*:*:*:*:*:*
  • cpe:2.3:a:oracle:communications_cloud_native_core_network_repository_function:22.1.2:*:*:*:*:*:*:*
  • cpe:2.3:a:oracle:communications_cloud_native_core_network_repository_function:22.2.0:*:*:*:*:*:*:*
  • cpe:2.3:a:oracle:communications_cloud_native_core_security_edge_protection_proxy:22.1.1:*:*:*:*:*:*:*
  • cpe:2.3:a:splunk:universal_forwarder:*:*:*:*:*:*:*:*
  • cpe:2.3:a:splunk:universal_forwarder:9.1.0:*:*:*:*:*:*:*

References 32