CVE-2020-24455

Publication date 26 February 2021

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

Missing initialization of a variable in the TPM2 source may allow a privileged user to potentially enable an escalation of privilege via local access. This affects tpm2-tss before 3.0.1 and before 2.4.3.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
tpm2-tss	20.10 groovy	Not affected
	20.04 LTS focal	Not affected
	18.04 LTS bionic	Not affected
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not in release

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

Severity score breakdown

CVSS version: CVSS v3.0

Base score 6.7 · Medium

Base metrics

Parameter	Value
Attack vector	Local
Attack complexity	Low
Privileges required	High
User interaction	None
Scope	Unchanged
Confidentiality impact	High
Integrity impact	High
Availability impact	High

Scores

Parameter	Value
Base score	6.7 · Medium
Exploitability score	-
Impact score	-

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

References

MITRE
NVD
Launchpad
Debian

Other references

https://github.com/tpm2-software/tpm2-tss/commit/0cc5f0e12694f3780a8512fc37a7dbc542ea4330 (master)
https://github.com/tpm2-software/tpm2-tss/commit/9536b79cd5a13884a7e4de7a571f72530180c20b (3.0.1)
https://github.com/tpm2-software/tpm2-tss/commit/bf24b0ef0fa8de9300a323f70a097a1afd818439 (2.4.5)
https://www.cve.org/CVERecord?id=CVE-2020-24455