Apache HTTP Server 1.3.22 through 1.3.27 on OpenBSD allows remote attackers to obtain sensitive information via (1) the ETag header, which reveals the inode number, or (2) multipart MIME boundary, which reveals child process IDs (PID).
https://exchange.xforce.ibmcloud.com/vulnerabilities/11438
http://www.securityfocus.com/bid/6943
http://www.securityfocus.com/bid/6939
http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html