CVE-2020-28009 Integer overflow in n/a
An integer overflow in Exim's get_stdinput function can lead to a buffer overflow, potentially allowing remote code execution, though exploitation is difficult due to long execution times.
- 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-2020-28009?
CVE-2020-28009 is a high-severity 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 Integer Overflow to Buffer Overflow because get_stdinput allows unbounded reads that are accompanied by unbounded increases in a certain size variable. NOTE: exploitation may be impractical because of the execution time needed to overflow (multiple days).
Weakness: CWE-190
Which versions are affected by CVE-2020-28009?
It affects 1 product.
Products include Exim Exim.
How do I fix CVE-2020-28009?
Upgrade to a fixed version.
Is CVE-2020-28009 being exploited?
There is no known exploitation of CVE-2020-28009 in the wild and no public exploit code.
Other vulnerabilities in Exim Exim
Sources
Also known as CLEANSTART-2025-EI23085, DEBIAN-CVE-2020-28009, GHSA-395v-ww5m-qq2x, UBUNTU-CVE-2020-28009.