DescriptionExim Improper Neutralization of Special Elements Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Exim. Authentication is not required to exploit this vulnerability. The specific flaw exists within the smtp service, which listens on TCP port 25 by default. The issue results from the lack of proper validation of user-supplied data, which can result in a memory corruption condition. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-17554.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
exim4 (PTS)bullseye4.94.2-7+deb11u2vulnerable
bullseye (security)4.94.2-7+deb11u3vulnerable
bookworm (security)4.96-15+deb12u5fixed
sid, trixie4.98-1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs


[bullseye] - exim4 <no-dsa> (Only an issue if Exim4 run behind an untrusted proxy-protocol proxy)
[buster] - exim4 <no-dsa> (Only an issue if Exim4 run behind an untrusted proxy-protocol proxy)

Search for package or bug name: Reporting problems