Exim 4 prior to 4.94.2 allows Heap-based Buffer Overflow in queue_run via two sender options: -R and -S. This may cause privilege escalation from exim to root.
The Qualys Research Labs reported several vulnerabilities in Exim, a
mail transport agent, which could result in local privilege escalation
and remote code execution
Details can be found in the Qualys advisory at
wwwqualyscom/2021/05/04/21nails/21nailstxt
For the stable distribution (buster), these problems have been fixed in
version 4 ...
Exim 4 before 4942 allows Execution with Unnecessary Privileges Because Exim operates as root in the log directory (owned by a non-root user), a symlink or hard link attack allows overwriting critical root-owned files anywhere on the filesystem (CVE-2020-28007)
Exim 4 before 4942 allows Execution with Unnecessary Privileges Because Exim oper ...
Vulmon