CVE-2019-17455

critical

Description

Libntlm through 1.5 relies on a fixed buffer size for tSmbNtlmAuthRequest, tSmbNtlmAuthChallenge, and tSmbNtlmAuthResponse read and write operations, as demonstrated by a stack-based buffer over-read in buildSmbNtlmAuthRequest in smbutil.c for a crafted NTLM request.

References

Advisories
More

https://security-tracker.debian.org/tracker/CVE-2019-17455

https://people.canonical.com/~ubuntu-security/cve/2019/CVE-2019-17455.html

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YZ5YWYNOJ5HMCKAHWLTY4MXZQWJJCBI7/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3BVFO3OVJPMSGIXBKNOCVOJZ3UTGZQF5/

https://lists.debian.org/debian-lts-announce/2021/11/msg00026.html

https://lists.debian.org/debian-lts-announce/2020/05/msg00010.html

http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00032.html

http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00029.html

https://gitlab.com/jas/libntlm/issues/2

https://euvd.enisa.europa.eu/vulnerability/EUVD-2019-7844

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=942145

Details

Source: Mitre, NVD

Published: 2019-10-10

Updated: 2026-06-17

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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Severity: Critical

EPSS

EPSS: 0.04635