nginx http proxy module does not verify peer identity of https origin server which could facilitate man-in-the-middle attack (MITM)
https://security-tracker.debian.org/tracker/CVE-2011-4968
https://exchange.xforce.ibmcloud.com/vulnerabilities/80952
https://bugzilla.suse.com/show_bug.cgi?id=CVE-2011-4968
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2011-4968