ZNC before 1.7.1-rc1 does not properly validate untrusted lines coming from the network, allowing a non-admin user to escalate his privilege and inject rogue values into znc.conf.
https://www.debian.org/security/2018/dsa-4252
https://security.gentoo.org/glsa/201807-03
https://github.com/znc/znc/commit/d22fef8620cdd87490754f607e7153979731c69d
https://github.com/znc/znc/commit/a7bfbd93812950b7444841431e8e297e62cb524e