vulnerability
Ubuntu: USN-6455-1 (CVE-2023-42117): Exim vulnerabilities
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 10 | (AV:N/AC:L/Au:N/C:C/I:C/A:C) | Oct 26, 2023 | Nov 2, 2023 | Apr 16, 2026 |
Severity
10
CVSS
(AV:N/AC:L/Au:N/C:C/I:C/A:C)
Published
Oct 26, 2023
Added
Nov 2, 2023
Modified
Apr 16, 2026
Description
Exim Improper Neutralization of Special Elements Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Exim. Authentication is not required to exploit this vulnerability.
The specific flaw exists within the smtp service, which listens on TCP port 25 by default. The issue results from the lack of proper validation of user-supplied data, which can result in a memory corruption condition. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-17554.
Solutions
ubuntu-pro-upgrade-exim4-daemon-heavyubuntu-pro-upgrade-exim4-daemon-lightubuntu-upgrade-exim4-daemon-heavyubuntu-upgrade-exim4-daemon-light
Rapid7 Labs
2026 Global Threat Landscape Report
The predictive window has collapsed. Exploitation follows disclosure in days. See how attackers are accelerating and how to stay ahead.