Out-of-bounds Read in Exim

CVE-2023-42114

Exim NTLM Challenge Out-Of-Bounds Read Information Disclosure Vulnerability. This vulnerability allows remote attackers to disclose sensitive information on affected installations of Exim. Authentication is not required to exploit this vulnerability. The specific flaw exists within the handling of NTLM challenge requests. The issue results from the lack of proper validation of user-supplied data, which can result in a read past the end of an allocated data structure. An attacker can leverage this vulnerability to disclose information in the context of the service account. . Was ZDI-CAN-17433.

Vulnerability class: Buffer Overflow

EPSS: 0.281 (97.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

Affected products

  • Exim — versions exim 4.95

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2023-42114?
CVE-2023-42114 is a medium-severity vulnerability in Exim, classified under Out-of-bounds Read. CVSS score: 5.3/10. Published 2024-05-03.
How severe is CVE-2023-42114?
Medium severity. CVSS v3 base score is 5.3 out of 10.
Is CVE-2023-42114 known to be exploited?
1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.