CVE Catalog

CVE-2003-0743

High
Published: Translated: NVD NIST

Summary

A heap-based buffer overflow exists in Exim 3 before version 3.36 and Exim 4 before version 4.21, which may allow remote attackers to execute arbitrary code. This issue occurs in smtp_in.c when HELO or EHLO arguments contain a large number of spaces followed by a NULL character and a newline.

Risk Assessment

Attackers may exploit this vulnerability to execute remote code, potentially leading to full control over the mail server. This poses a serious threat to the integrity and availability of the system.

Recommendation

It is recommended to upgrade Exim to version 3.36 or 4.21 or later to mitigate this vulnerability. Additionally, implementing input filtering mechanisms is advisable.

Related vulnerabilities

Original NVD description (English source)

Heap-based buffer overflow in smtp_in.c for Exim 3 (exim3) before 3.36 and Exim 4 (exim4) before 4.21 may allow remote attackers to execute arbitrary code via an invalid (1) HELO or (2) EHLO argument with a large number of spaces followed by a NULL character and a newline, which is not properly trimmed before the "(no argument given)" string is appended to the buffer.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS