CVE-2020-28010 Memory corruption in n/a
A local attacker can exploit an out-of-bounds write in Exim's setuid root main function to execute arbitrary code with root privileges.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-28010?
CVE-2020-28010 is a high-severity memory corruption vulnerability in Exim Exim, published on 6 May 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Exim 4 before 4.94.2 allows Out-of-bounds Write because the main function, while setuid root, copies the current working directory pathname into a buffer that is too small (on some common platforms).
Weakness: CWE-787
Which versions are affected by CVE-2020-28010?
It affects 1 product.
Products include Exim Exim.
How do I fix CVE-2020-28010?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2020-28010 being exploited?
There is no known exploitation of CVE-2020-28010 in the wild and no public exploit code.
Other vulnerabilities in Exim Exim
Sources
Also known as CLEANSTART-2025-BU86059, DEBIAN-CVE-2020-28010, GHSA-w3gp-2mmc-9mvh, UBUNTU-CVE-2020-28010.