The CClient::ProcessServerPacket method in engine/client/client.cpp in Teeworlds before 0.6.4 allows remote servers to write to arbitrary physical memory locations and possibly execute arbitrary code via vectors involving snap handling.
www.openwall.com/lists/oss-security/2016/11/16/8
www.openwall.com/lists/oss-security/2016/11/17/8
www.securityfocus.com/bid/94381
github.com/teeworlds/teeworlds/commit/ff254722a2683867fcb3e67569ffd36226c4bc62
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/C4JNSBXXPE7O32ZMFK7D7YL6EKLG7PRV/
security.gentoo.org/glsa/201705-13
www.teeworlds.com/?page=news&id=12086