CVE catalog

CVE-2019-17455

libntlm: CVE-2019-17455

Severity: Critical · CVSS 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: Oct 8, 2019, 12:00:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 3.11% · Oct 27, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	libntlm	sid	`1.8-6`	fixed
Debian	libntlm	forky	`1.8-6`	fixed
Debian	libntlm	trixie	`1.8-4`	fixed
Debian	libntlm	bookworm	`1.6-4`	fixed
Ubuntu	libntlm	pro	`1.4-7`	vulnerable
Ubuntu	libntlm	pro	`1.4-7ubuntu0.1~esm1`	fixed
Ubuntu	libntlm	pro	`1.4-7`	vulnerable
Ubuntu	libntlm	pro	`1.4-7ubuntu0.1~esm1`	fixed
Ubuntu	libntlm	18.04	`1.4-8`	vulnerable
Ubuntu	libntlm	18.04	`1.4-8ubuntu0.1`	fixed
Ubuntu	libntlm	20.04	`1.5-2`	vulnerable
Ubuntu	libntlm	20.04	`1.5-2ubuntu0.1`	fixed
Ubuntu	libntlm	18.04	`1.4-8`	vulnerable
Ubuntu	libntlm	18.04	`1.4-8ubuntu0.1`	fixed
Ubuntu	libntlm	20.04	`1.5-2`	vulnerable
Ubuntu	libntlm	20.04	`1.5-2ubuntu0.1`	fixed
Suse	libntlm	package hub 15 sp1	`1.6-bp151.4.3.1`	fixed
Opensuse	libntlm	leap 15.1	`1.6-lp151.3.3.1`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	libntlm	source	sid	`1.6-1`	not yet assigned	Not reported	[942145]
Debian	libntlm	source	forky	`1.6-1`	not yet assigned	Not reported	[942145]
Debian	libntlm	source	trixie	`1.6-1`	not yet assigned	Not reported	[942145]
Debian	libntlm	source	bookworm	`1.6-1`	not yet assigned	Not reported	[942145]
Ubuntu	libntlm	deb	pro	`1.4-7ubuntu0.1~esm1`	Not reported	USN-5108-2	Not reported
Ubuntu	libntlm	deb	pro	`1.4-7ubuntu0.1~esm1`	Not reported	UBUNTU-CVE-2019-17455	Not reported
Ubuntu	libntlm	deb	18.04	`1.4-8ubuntu0.1`	Not reported	UBUNTU-CVE-2019-17455	Not reported
Ubuntu	libntlm	deb	20.04	`1.5-2ubuntu0.1`	Not reported	UBUNTU-CVE-2019-17455	Not reported
Ubuntu	libntlm	deb	18.04	`1.4-8ubuntu0.1`	Not reported	USN-5108-1	Not reported
Ubuntu	libntlm	deb	20.04	`1.5-2ubuntu0.1`	Not reported	USN-5108-1	Not reported
Suse	libntlm	rpm	package hub 15 sp1	`1.6-bp151.4.3.1`	Not reported	OPENSUSE-SU-2020:0816-1	Not reported
Opensuse	libntlm	rpm	leap 15.1	`1.6-lp151.3.3.1`	Not reported	OPENSUSE-SU-2020:0806-1	Not reported

[Debian bug #942145]

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[libntlm0]Fixed
Source package: [libntlm]
Details (2)
- 1.6-4 · amd64 · bookworm
  Fixed · Fixed: 1.6-1
  dsa · libntlm · debian · bookworm; dsa · libntlm · debian · 12
- 1.6-4 · arm64 · bookworm
  Fixed · Fixed: 1.6-1
  dsa · libntlm · debian · bookworm; dsa · libntlm · debian · 12
[libntlm0-dev]Fixed
Source package: [libntlm]
Details (2)
- 1.6-4 · amd64 · bookworm
  Fixed · Fixed: 1.6-1
  dsa · libntlm · debian · bookworm; dsa · libntlm · debian · 12
- 1.6-4 · arm64 · bookworm
  Fixed · Fixed: 1.6-1
  dsa · libntlm · debian · bookworm; dsa · libntlm · debian · 12

[Debian 13 (Trixie)]

[libntlm0]Fixed
Source package: [libntlm]
Details (2)
- 1.8-4 · amd64 · trixie
  Fixed · Fixed: 1.6-1
  dsa · libntlm · debian · 13
- 1.8-4 · arm64 · trixie
  Fixed · Fixed: 1.6-1
  dsa · libntlm · debian · 13
[libntlm0-dev]Fixed
Source package: [libntlm]
Details (2)
- 1.8-4 · amd64 · trixie
  Fixed · Fixed: 1.6-1
  dsa · libntlm · debian · 13
- 1.8-4 · arm64 · trixie
  Fixed · Fixed: 1.6-1
  dsa · libntlm · debian · 13

Observed: Oct 23, 2026, 5:41:49 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]