CVE-2005-0021: University Of Cambridge Exim

High severity, CVSS 7.2. EPSS: 2.6% chance of exploitation in the next 30 days.

Multiple buffer overflows in Exim before 4.43 may allow attackers to execute arbitrary code via (1) an IPv6 address with more than 8 components, as demonstrated using the -be command line option, which triggers an overflow in the host_aton function, or (2) the -bh command line option or dnsdb PTR lookup, which triggers an overflow in the dns_build_reverse function.

Affected products

• University Of Cambridge Exim: up to and including 4.40; version 4.41 only; version 4.42 only

Published 2005-05-02. Last modified 2026-06-16.