CVE-2023-42114: exim Out-of-bounds Read
Vulnerability summary
CVE-2023-42114 is a medium (CVSS 5.3) Out-of-bounds Read vulnerability in exim. EPSS estimates a 26.86% chance of exploitation in the next 30 days, higher than 98% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 6 · Related 6Timeline
- 03-05-2024PublishedVulnerability first disclosed.
- 04-11-2025Last modifiedVulnerability information updated.
Description
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.
CVSS metrics
8 scores · 6 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated5.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- OSV · DebianEcosystem advisory · calculated5.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- OSV · UbuntuEcosystem advisory · calculated3.7LowCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
- OSV · WolfiEcosystem advisory · calculated3.7LowCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
- OSV · ChainguardEcosystem advisory · calculated3.7LowCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
- NVDNIST3.7LowCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
EPSS trend
Probability
26.86%
Chance of exploitation in the next 30 days
Percentile
98%
Versus all other CVEs
30-day change
-1.22 pp
From 28.08% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Chainguard1 product
- exim< 4.96.1-r0
Debian1 product
- exim4< 4.96-15+deb12u2 | < 4.97~RC1-2
Exim1 product
- eximexim 4.95 | < 4.96.1
Ubuntu1 product
- exim4< 4.82-3ubuntu2.4+esm6 | < 4.86.2-2ubuntu2.6+esm4 | < 4.90.1-1ubuntu1.10+esm1 | < 4.93-13ubuntu1.8 | < 4.95-4ubuntu2.3
Wolfi1 product
- exim< 4.96.1-r0
5 vendors · 5 products
References
9 links- www.zerodayinitiative.com/advisories/ZDI-23-1468/X Research AdvisoryREPORTAdvisoryThird Party Advisory
