CVE-2021-22897

MEDIUM

curl 7.61.0-7.76.1 - Data Element Exposure via CURLOPT_SSL_CIPHER_LIST

Title source: llm
STIX 2.1

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://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 0.0298
EPSS Percentile 85.5%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CISA SSVC

Vulnrichment
Exploitation poc
Automatable yes
Technical Impact partial

Details

CWE
CWE-668 CWE-840
Status published
Products (25)
None/https://github.com/curl/curl 7.61.0 through 7.76.1
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
... and 15 more
Published Jun 11, 2021
Tracked Since Feb 18, 2026