CVE-2019-16928
Published 2019-09-27 · Updated 2026-06-17 · Source cve@mitre.org
Summary
CVE-2019-16928 is a critical-severity (CVSS 9.8) vulnerability in Exim Exim Internet Mailer. CISA added it to the Known Exploited Vulnerabilities catalog on March 3, 2022, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by March 17, 2022. CISA does not currently list it as used in ransomware campaigns. Exim has 5 vulnerabilities in the KEV catalog, 1 of them linked to ransomware.
All 5 known-exploited Exim vulnerabilities →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.
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA Known-Exploited Vulnerability
Product: Exim — Exim Internet Mailer
Name: Exim Out-of-bounds Write Vulnerability
Date added: 2022-03-03 · Due: 2022-03-17
Required action: Apply updates per vendor instructions.
References
- http://www.openwall.com/lists/oss-security/2019/09/28/1
- http://www.openwall.com/lists/oss-security/2019/09/28/2
- http://www.openwall.com/lists/oss-security/2019/09/28/3
- http://www.openwall.com/lists/oss-security/2019/09/28/4
- https://bugs.exim.org/show_bug.cgi?id=2449
- https://git.exim.org/exim.git/commit/478effbfd9c3cc5a627fc671d4bf94d13670d65f
- https://lists.exim.org/lurker/message/20190927.032457.c1044d4c.en.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EED7HM3MFIBAP5OIMJAFJ35JAJABTVSC/