A buffer overflow was discovered in the URL-authentication backend of the Icecast before 2.4.4. If the backend is enabled, then any malicious HTTP client can send a request for that specific resource including a crafted header, leading to denial of service and potentially remote code execution.
https://www.debian.org/security/2018/dsa-4333
https://security.gentoo.org/glsa/201811-09
https://lists.debian.org/debian-lts-announce/2018/11/msg00033.html