Exim Improper Neutralization of Special Elements Remote Code Execution Vulnerability
CVE-2023-42117

9.8CRITICAL

Key Information:

Vendor

Exim

Status
Exim
Vendor
CVE Published:
3 May 2024

What is CVE-2023-42117?

A critical vulnerability exists in the Exim SMTP service, allowing remote attackers to execute arbitrary code on affected systems without requiring authentication. The issue stems from improper validation of user-supplied data, which leads to memory corruption. The vulnerability can be exploited via the default listening port TCP 25, providing an avenue for attackers to execute malicious code in the context of the current process. Organizations using Exim should prioritize remediation to safeguard their systems against potential exploitation.

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Deploy the Patch

Affected Version(s)

Exim 4.96-RC1-11-315206fbf

References

https://www.zerodayinitiative.com/advisories/ZDI-23-1471/
x_research-advisory

EPSS Score

7% chance of being exploited in the next 30 days.

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

CVSS V3.0

Score:
8.1
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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