CVE-2021-22924
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 confi…
Published Aug 5, 2021 · updated Oct 14, 2026 · haxx libcurl
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.
Timeline
Detection, updates, and resolution for this record.
Aug 5, 2021 · NIST NVD
Detected
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 no
Oct 14, 2026 · NIST NVD
Updated
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 no
Affected
- cpe debian/debian linux10.0
- cpe debian/debian linux11.0
- cpe debian/debian linux9.0
- cpe fedoraproject/fedora33
- cpe haxx/libcurlversion unspecified
- cpe netapp/cloud backupversion unspecified
- cpe netapp/clustered data ontapversion unspecified
- cpe netapp/solidfire & hci management nodeversion unspecified
- cpe oracle/mysql serverversion unspecified
- cpe siemens/logo! cmr2020 firmwareversion unspecified
- cpe siemens/logo! cmr2040 firmwareversion unspecified
- cpe siemens/sinec infrastructure network servicesversion unspecified
Sources
- CVE.orgCVE-2021-22924
Official CVE identifier
cve.org - NIST NVDCVE-2021-22924
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
nvd.nist.gov