CVE-2020-12783: Canonical Ubuntu Linux

High severity, CVSS 7.5. EPSS: 4.6% chance of exploitation in the next 30 days.

Exim through 4.93 has an out-of-bounds read in the SPA authenticator that could result in SPA/NTLM authentication bypass in auths/spa.c and auths/auth-spa.c.

Affected products

• Canonical Ubuntu Linux: version 14.04 only; version 16.04 only; version 18.04 only; version 19.10 only; version 20.04 only
• Debian Debian Linux: version 8.0 only; version 9.0 only; version 10.0 only
• Exim Exim: up to and including 4.93
• Fedoraproject Fedora: version 31 only; version 32 only

Published 2020-05-11. Last modified 2026-06-17.