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.
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