CVE-2019-16928: Exim Out-of-bounds Write Vulnerability

Critical severity, CVSS 9.8. Actively exploited: in CISA KEV since 2022-03-03. EPSS: 41.6% chance of exploitation in the next 30 days.

Exim 4.92 through 4.92.2 allows remote code execution, a different vulnerability than CVE-2019-15846. There is a heap-based buffer overflow in string_vformat in string.c involving a long EHLO command.

Affected products

• Canonical Ubuntu Linux: version 19.04 only
• Debian Debian Linux: version 10.0 only
• Exim Exim: from 4.92, up to and including 4.92.2
• Fedoraproject Fedora: version 29 only; version 30 only; version 31 only

Published 2019-09-27. Last modified 2026-06-17.