CVE-2020-28015 Command injection in n/a

High 7.8 Published 6 May 2021 Updated 4 Aug 2024

Local users can inject newlines into recipient addresses to alter root process behavior, potentially leading to privilege escalation or code execution.

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-2020-28015?

CVE-2020-28015 is a high-severity command injection 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 has Improper Neutralization of Line Delimiters. Local users can alter the behavior of root processes because a recipient address can have a newline character.

Which versions are affected by CVE-2020-28015?

It affects 1 product.

Products include Exim Exim.

How do I fix CVE-2020-28015?

Upgrade to a fixed version.

Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.

Is CVE-2020-28015 being exploited?

There is no known exploitation of CVE-2020-28015 in the wild and no public exploit code.

All Exim Exim vulnerabilities

Sources

Also known as CLEANSTART-2025-TZ25317, DEBIAN-CVE-2020-28015, GHSA-m6cw-6vw3-xxqc, UBUNTU-CVE-2020-28015.