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[ CVE-2019-16928 · Published 27 Sep 2019 ]

Exim Out-of-bounds Write Vulnerability

Exploited · CISA KEV CVSS 9.8 EPSS 42%Fix available

[ Why it matters ]Priority signals

  • Exploited in the wild: on CISA's Known Exploited Vulnerabilities list since 2022-03-03
  • EPSS: 42% chance of exploitation in the next 30 days (higher than 99% of CVEs)
  • Critical severity: CVSS 9.8

[ Description ]Official description

Exim 4.92 through 4.92.2 allows remote code execution, a different vulnerability than CVE-2019-15846. There is a heap-based buffer overflow in string_vformat in string.c involving a long EHLO command.

CISA: Exim contains an out-of-bounds write vulnerability which can allow for remote code execution.

[ Fixes ]Fixes and patches

CISA required action (US federal deadline 17 Mar 2022): Apply updates per vendor instructions.

[ References ]References