CVE Catalog

CVE-2005-0021

High
Published: Translated: NVD NIST

Summary

Multiple buffer overflows in Exim before 4.43 may allow attackers to execute arbitrary code via (1) an IPv6 address with more than 8 components, as demonstrated using the -be command line option, which triggers an overflow in the host_aton function, or (2) the -bh command line option or dnsdb PTR lookup, which triggers an overflow in the dns_build_reverse function.

Risk Assessment

An attacker can remotely execute arbitrary code on the mail server, leading to full system compromise, data leakage, or service disruption.

Recommendation

Immediately upgrade Exim to version 4.43 or later. If upgrading is not possible, restrict access to the -be and -bh options and disable dnsdb PTR lookups.

Related vulnerabilities

Original NVD description (English source)

Multiple buffer overflows in Exim before 4.43 may allow attackers to execute arbitrary code via (1) an IPv6 address with more than 8 components, as demonstrated using the -be command line option, which triggers an overflow in the host_aton function, or (2) the -bh command line option or dnsdb PTR lookup, which triggers an overflow in the dns_build_reverse function.

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