libcurl built on top of NSS (Network Security Services) incorrectly re-used client certificates if a certificate from file was used for one TLS connection but no certificate set for a subsequent TLS connection.
While the symptoms are similar to CVE-2016-5420 (Re-using connection with wrong client cert), this vulnerability was caused by an implementation detail of the NSS backend in libcurl, which is orthogonal to the cause of CVE-2016-5420.
{ "CWE": { "id": "CWE-305", "desc": "Authentication Bypass by Primary Weakness" }, "package": "curl", "URL": "https://curl.se/docs/CVE-2016-7141.json", "severity": "High", "www": "https://curl.se/docs/CVE-2016-7141.html", "last_affected": "7.50.1" }