CVE-2019-19977

Publication date 26 December 2019

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

libESMTP through 1.0.6 mishandles domain copying into a fixed-size buffer in ntlm_build_type_2 in ntlm/ntlmstruct.c, as demonstrated by a stack-based buffer over-read.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
libesmtp	19.10 eoan	Not affected
	19.04 disco	Not affected
	18.04 LTS bionic	Not affected
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not affected

How can I get the fixes?
What do statuses mean?

Notes

mdeslaur

Ubuntu packages not built with --enable-ntlm

Severity score breakdown

Parameter	Value
Base score	9.8 · Critical
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

MITRE
NVD
Launchpad
Debian

Other references

https://github.com/Kirin-say/Vulnerabilities/blob/master/Stack_Overflow_in_libesmtp.md
https://github.com/jbouse-debian/libesmtp/blob/ca5bd0800ef1da234315da4c59716568eb5e6402/ntlm/ntlmstruct.c#L228-L242
https://web.archive.org/web/20190528215510/http://brianstafford.info/libesmtp/
https://www.cve.org/CVERecord?id=CVE-2019-19977