VulnerabilityModified

CVE-2023-42117

Exim Improper Neutralization of Special Elements Remote Code Execution Vulnerability.

CRITICAL 9.8EPSS 5.72%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (5.72%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

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: 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS: 5.72% probability · 93th percentile
CISA KEV: Not listed
Weakness: CWE-138
Affected: exim/exim
Source: zdi-disclosures@trendmicro.com

References

https://www.zerodayinitiative.com/advisories/ZDI-23-1471/Third Party Advisory
https://lists.debian.org/debian-lts-announce/2024/10/msg00029.html
https://www.zerodayinitiative.com/advisories/ZDI-23-1471/Third Party Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.