CVE-2019-16928

critical

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.

From the Tenable Blog

CVE-2019-16928: Critical Buffer Overflow Flaw in Exim is Remotely Exploitable

CVE-2019-16928: Critical Buffer Overflow Flaw in Exim is Remotely Exploitable

Published: 2019-09-30

CVE-2019-16928, a critical heap-based buffer overflow vulnerability in Exim email servers, could allow remote attackers to crash Exim or potentially execute arbitrary code.

References

https://www.debian.org/security/2019/dsa-4536

https://usn.ubuntu.com/4141-1/

https://security.gentoo.org/glsa/202003-47

https://seclists.org/bugtraq/2019/Sep/60

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UY6HPRW7MR3KBQ5JFHH6OXM7YCZBJCOB/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/T3TJW4HPYH3O5HZCWGD6NSHTEBTTAPDC/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EED7HM3MFIBAP5OIMJAFJ35JAJABTVSC/

http://www.openwall.com/lists/oss-security/2019/09/28/4

http://www.openwall.com/lists/oss-security/2019/09/28/3

https://www.tenable.com/blog/how-covid-19-response-is-expanding-the-cyberattack-surface

https://lists.exim.org/lurker/message/20190927.032457.c1044d4c.en.html

https://git.exim.org/exim.git/commit/478effbfd9c3cc5a627fc671d4bf94d13670d65f

https://bugs.exim.org/show_bug.cgi?id=2449

http://www.openwall.com/lists/oss-security/2019/09/28/2

http://www.openwall.com/lists/oss-security/2019/09/28/1

Details

Source: Mitre, NVD

Published: 2019-09-27

Updated: 2025-03-07

Known Exploited Vulnerability (KEV)

Risk Information

CVSS v2

Base Score: 7.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

Severity: High

CVSS v3

Base Score: 9.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Severity: Critical

EPSS

EPSS: 0.89447