CVE-2023-42117
Exim remote code execution
- Published3 May 2024
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.
CVSS 3.1 breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HAffected products
Remediation
References
Frequently asked
Is CVE-2023-42117 being actively exploited?
CVE-2023-42117 is not in the CISA KEV catalog. Its EPSS exploit probability is 6.79%.
How severe is CVE-2023-42117?
CVE-2023-42117 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 6.79% probability of exploitation.
Which products are affected by CVE-2023-42117?
Affected products include Exim.
How do I fix CVE-2023-42117?
Upgrade affected software to a fixed version, for example Exim 4.96.2 or later, then confirm no affected versions remain in your inventory.
How Secuno handles this
Secuno correlates vulnerabilities like CVE-2023-42117 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.
Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.