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[ CVE-2010-4344 · Published 14 Dec 2010 ]

Exim Heap-Based Buffer Overflow Vulnerability

Exploited · CISA KEV CVSS 9.8 EPSS 72%Fix available

[ Why it matters ]Priority signals

  • Exploited in the wild: on CISA's Known Exploited Vulnerabilities list since 2022-03-25
  • EPSS: 72% chance of exploitation in the next 30 days (higher than 99% of CVEs)
  • Critical severity: CVSS 9.8

[ Description ]Official description

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.

CISA: 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.

[ Fixes ]Fixes and patches

CISA required action (US federal deadline 15 Apr 2022): Apply updates per vendor instructions.

[ References ]References