CVE-2019-20373

LTSP LDM through 2.18.06 allows fat-client root access because the LDM_USERNAME variable may have...

7.8 HighFix available

LTSP LDM through 2.18.06 allows fat-client root access because the LDM_USERNAME variable may have an empty value if the user's shell lacks support for Bourne shell syntax. This is related to a run-x-session script.

Attack profile

How easy it is to exploit

Attack vector: Local
Complexity: Low
Privileges needed: Low
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

0.44%Down 0.4 points since Apr 14, 2021

What each source reports

NVD Score used 7.8

Record: CVE-2019-20373
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0: 7.2 HighAV:L/AC:L/Au:N/C:C/I:C/A:C
Updated: 2026-11-02

CVE List No score

Record: CVE-2019-20373
Updated: 2026-11-02

EUVDEUVD-2019-10925 No score

Record: EUVD-2019-10925
Updated: 2026-11-03

GitHub AdvisoriesGHSA-7fp6-mjg4-r496 No score

LTSP LDM through 2.18.06 allows fat-client root access because the LDM_USERNAME variable may have...

Record: GHSA-7fp6-mjg4-r496
Updated: 2026-11-02

OSVUBUNTU-CVE-2019-20373 7.8

Record: UBUNTU-CVE-2019-20373
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`ldm` Debian:8	before 2:2.2.15-2+deb8u1, plus listed versions 2:2.2.15-2	2:2.2.15-2+deb8u1
`ldm` Debian:9	before 2:2.2.18-2+deb9u1, plus listed versions 2:2.2.18-2	2:2.2.18-2+deb9u1
`ldm` Debian:10	before 2:2.18.06-1+deb10u1, plus listed versions 2:2.18.06-1	2:2.18.06-1+deb10u1
`ldm` Ubuntu:16.04:LTS	All versions, plus listed versions 2:2.2.17-12:2.2.18-1	None known
`ldm` Ubuntu:18.04:LTS	All versions, plus listed versions 2:2.2.18-22:2.2.19-1	None known
`ldm` Ubuntu:20.04:LTS	before 2:2.18.06-1+deb10u1build0.20.04.1, plus listed versions 2:2.18.06-1	2:2.18.06-1+deb10u1build0.20.04.1

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2019-20373 is a high vulnerability (CVSS 7.8) in Ltsp Ldm, published January 9, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.44%, the 38th percentile. Fixed in ldm 2:2.2.15-2+deb8u1.