nscd in the GNU C Library (aka glibc or libc6) before version 2.20 does not correctly compute the size of an internal buffer when processing netgroup requests, possibly leading to an nscd daemon crash or code execution as the user running nscd.
packetstormsecurity.com/files/153278/WAGO-852-Industrial-Managed-Switch-Series-Code-Execution-Hardcoded-Credentials.html
packetstormsecurity.com/files/154361/Cisco-Device-Hardcoded-Credentials-GNU-glibc-BusyBox.html
seclists.org/fulldisclosure/2019/Jun/18
seclists.org/fulldisclosure/2019/Sep/7
www.securityfocus.com/bid/99071
seclists.org/bugtraq/2019/Jun/14
seclists.org/bugtraq/2019/Sep/7
sourceware.org/bugzilla/show_bug.cgi?id=16695
sourceware.org/git/gitweb.cgi?p=glibc.git%3Ba=commit%3Bh=c44496df2f090a56d3bf75df930592dac6bba46f