CVE-2020-28020 Integer overflow in n/a
An unauthenticated remote attacker can execute arbitrary code on Exim mail servers due to an integer overflow in header processing.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-28020?
CVE-2020-28020 is a critical vulnerability in Exim Exim, published on 6 May 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Exim 4 before 4.92 allows Integer Overflow to Buffer Overflow, in which an unauthenticated remote attacker can execute arbitrary code by leveraging the mishandling of continuation lines during header-length restriction.
Weakness: CWE-190
Which versions are affected by CVE-2020-28020?
It affects 1 product.
Products include Exim Exim.
How do I fix CVE-2020-28020?
Upgrade to a fixed version.
Is CVE-2020-28020 being exploited?
There is no known exploitation of CVE-2020-28020 in the wild and no public exploit code.
Other vulnerabilities in Exim Exim
Sources
Also known as CLEANSTART-2025-KN85431, DEBIAN-CVE-2020-28020, GHSA-p795-3xjq-48vx, UBUNTU-CVE-2020-28020.