CVE-2023-42114: low-severity vulnerability in Exim
Exim NTLM Challenge Out-Of-Bounds Read Information Disclosure Vulnerability
Published · Updated
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 3.7epss 27%
exploitation probability
27%top 2% of all CVEs
observed exploitation
nono source reports it
In short
Exim email server has a flaw in how it processes NTLM authentication requests, allowing attackers to read memory and leak sensitive information without needing to log in.
Technical detail
CWE-125 out-of-bounds read vulnerability in Exim's NTLM challenge handling due to insufficient input validation. Remote unauthenticated attacker can trigger a read past allocated buffer boundaries, disclosing sensitive data in the service account context.
Summary generated and translated by AI from the official 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:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Affected products
Exim · EximRelated CVEs — Exim
In the same product, most dangerous first.
CVE-2025-26794HIGHCVE-2025-26794EPSS 77.6%CVE-2023-42115CRITICALExim AUTH Out-Of-Bounds Write Remote Code Execution VulnerabilityEPSS 12.1%CVE-2023-42117HIGHExim Improper Neutralization of Special Elements Remote Code Execution VulnerabilityEPSS 6.8%CVE-2023-42116HIGHExim SMTP Challenge Stack-based Buffer Overflow Remote Code Execution VulnerabilityEPSS 3.8%CVE-2023-42119LOWExim dnsdb Out-Of-Bounds Read Information Disclosure VulnerabilityEPSS 1.6%CVE-2026-45185CRITICALCVE-2026-45185EPSS 0.9%