https://tsecurity.de/de/1554694/IT+Reverse+Engineering/Sicherheitsl%C3%BCcken/CVE-2015-5309+%7C+PuTTY+up+to+0.65+Terminal+Emulator+ECH+Character+Sequence+numeric+error+%28FEDORA-2015-3d17682c15+%2F+BID-78525%29/