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CVE-2010-4344

CriticalPublished

Exim Heap-Based Buffer Overflow Vulnerability

Published: Dec 14, 2010
Updated: Oct 22, 2025
Assigning CNA: redhat
Evidence observed: Dec 11, 2010

Primary CVSS

9.8/ 10Critical

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS probability estimate

71.7%

High · next 30 days

Percentile: 99.4%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

CISA Known Exploited

This CVE appears in the CISA Known Exploited Vulnerabilities catalog.

Summary

Heap-based buffer overflow in the string_vformat function in string.c in Exim before 4.70 allows remote attackers to execute arbitrary code via an SMTP session that includes two MAIL commands in conjunction with a large message containing crafted headers, leading to improper rejection logging.

Sources

Exim 4.63 - Remote Command ExecutionExploit
kingcope · linux · Dec 11, 2010
Exim4 < 4.69 - string_format Function Heap Buffer Overflow (Metasploit)Exploit
Metasploit · linux · Dec 16, 2010

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