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Exim 3.22 and earlier, in some configurations, does not properly verify the local part of an address when redirecting the address to a pipe, which could allow remote attackers to execute arbitrary commands via shell metacharacters.
Format string vulnerability in exim (3.22-10 in Red Hat, 3.12 in Debian and 3.16 in Conectiva) in batched SMTP mode allows a remote attacker to execute arbitrary code via format strings in SMTP mail headers.
Heap-based buffer overflow in smtpin.c for Exim 3 (exim3) before 3.36 and Exim 4 (exim4) before 4.21 may allow remote attackers to execute arbitrary code via an invalid (1) HELO or (2) EHLO argument with a large number of spaces followed by a NULL character and a newline, which is not properly trimmed before the "(no argument given)" string is appended to the buffer.
Stack-based buffer overflow in Exim 4 before 4.33, when the headerschecksyntax option is enabled, allows remote attackers to cause a denial of service and possibly execute arbitrary code during the header check.
Stack-based buffer overflow in Exim 3.35, and other versions before 4, when the senderverify option is true, allows remote attackers to cause a denial of service and possibly execute arbitrary code during sender verification.
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 hostaton function, or (2) the -bh command line option or dnsdb PTR lookup, which triggers an overflow in the dnsbuildreverse function.
Buffer overflow in Exim allows local users to gain root privileges via a long :include: option in a .forward file.
Format string vulnerability in daemon.c for Exim 4.x through 4.10, and 3.x through 3.36, allows exim administrative users to execute arbitrary code by modifying the pidfilepath value.
Buffer overflow in the spabase64tobits function in Exim before 4.43, as originally obtained from Samba code, and as called by the authspaclient function, may allow attackers to execute arbitrary code during SPA authentication.
Exim 3.34 and earlier may allow local users to gain privileges via a buffer overflow in long -C (configuration file) and other command line arguments.