Description
curl 7.61.0 through 7.76.1 suffers from exposure of data element to wrong session due to a mistake in the code for CURLOPT_SSL_CIPHER_LIST when libcurl is built to use the Schannel TLS library. The selected cipher set was stored in a single "static" variable in the library, which has the surprising side-effect that if an application sets up multiple concurrent transfers, the last one that sets the ciphers will accidentally control the set used by all transfers. In a worst-case scenario, this weakens transport security significantly.
References (8)
Core 8
Core References
Exploit, Issue Tracking, Third Party Advisory x_refsource_misc
https://hackerone.com/reports/1172857
Patch, Vendor Advisory x_refsource_misc
https://curl.se/docs/CVE-2021-22897.html
Patch, Third Party Advisory x_refsource_misc
https://github.com/curl/curl/commit/bbb71507b7bab52002f9b1e0880bed6a32834511
Patch, Third Party Advisory x_refsource_misc
https://www.oracle.com//security-alerts/cpujul2021.html
Patch, Third Party Advisory x_refsource_misc
https://www.oracle.com/security-alerts/cpujan2022.html
Third Party Advisory x_refsource_confirm
https://security.netapp.com/advisory/ntap-20210727-0007/
Patch, Third Party Advisory x_refsource_misc
https://www.oracle.com/security-alerts/cpuapr2022.html
Patch, Third Party Advisory x_refsource_confirm
https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf
Scores
CVSS v3
5.3
EPSS
0.0079
EPSS Percentile
74.0%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Details
CWE
CWE-840
CWE-668
Status
published
Products (24)
haxx/curl
7.61.0 - 7.76.1
netapp/cloud_backup
netapp/h300e_firmware
netapp/h300s_firmware
netapp/h410s_firmware
netapp/h500e_firmware
netapp/h500s_firmware
netapp/h700e_firmware
netapp/h700s_firmware
netapp/hci_compute_node_firmware
... and 14 more
Published
Jun 11, 2021
Tracked Since
Feb 18, 2026