It was discovered that ClamAV incorrectly handled parsing certain e-mail messages. A remote attacker could possibly use this issue to cause ClamAV to crash, resulting in a denial of service (CVE-2017-6418). It was discovered that ClamAV incorrectly handled parsing certain PE files with WWPack compression. A remote attacker could possibly use this issue to cause ClamAV to crash, resulting in a denial of service (CVE-2017-6420).