CVE-2012-5671: Exim

Medium severity, CVSS 6.8. EPSS: 8.4% chance of exploitation in the next 30 days.

Heap-based buffer overflow in the dkim_exim_query_dns_txt function in dkim.c in Exim 4.70 through 4.80, when DKIM support is enabled and acl_smtp_connect and acl_smtp_rcpt are not set to "warn control = dkim_disable_verify," allows remote attackers to execute arbitrary code via an email from a malicious DNS server.

Affected products

• Exim Exim: version 4.70 only; version 4.71 only; version 4.72 only; version 4.73 only; version 4.74 only; version 4.75 only; …

Published 2012-10-31. Last modified 2026-06-16.