Another Critical Exim Flaw, and How to Determine if You’re Affected

Exim released an urgent security advisory for CVE-2019-16928: a heap-based buffer overflow in the EHLO command handler affecting Exim versions up to 4.92.2. A public proof-of-concept exists that can crash Exim and the issue carries a CVSS score of 9.8; administrators are strongly advised to upgrade to Exim 4.92.3 and can use the provided Censys query to find affected servers.