spice versions though 0.13 are vulnerable to out-of-bounds memory access when processing specially crafted messages from authenticated attacker to the spice server resulting into crash and/or server memory leak.
https://bugzilla.redhat.com/show_bug.cgi?id=1452606
https://access.redhat.com/errata/RHSA-2018:3522
https://access.redhat.com/errata/RHSA-2017:2471
http://www.securityfocus.com/bid/99583