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Fencer Vulns
medium 6.7

CVE-2020-24455 json

Missing initialization of a variable in the TPM2 source may allow a privileged user to potentially enable an escalation of privilege via lo…

published 2021-02-26 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-17175

cvss
6.7
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 48%
public exploits
0
none known

Summary

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.

Patch / fix

  • tpm2_software_stack_project tpm2_software_stack 2.4.3, 3.0.1
  • tpm2-tss Debian 14, Debian 13, Debian 12 3.0.1-1

debian advisories DEBIAN-CVE-2020-24455

  • tpm2-0-tss openSUSE Tumbleweed 3.1.0-1.2

opensuse advisories openSUSE-SU-2024:11470-1

  • tpm2-tss CBL-Mariner 2.0 2.4.6-1

azure linux advisories AZL-6924

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-24455 updated cvss 4.1

tpm2-tss: FAPI PolicyPCR not instatiating correctly

  • Red Hat Enterprise Linux 7 tpm2-tss, tpm2-tss-utils Red Hat Enterprise Linux 8 tpm2-tss
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.58% chance of exploitation in the next 30 days, higher than 48% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 6.7 CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 4.6 AV:L/AC:L/Au:N/C:P/I:P/A:P

Affected products

  • n/a TPM2 source

Classification

Weakness
  • CWE-909 Missing Initialization of Resource

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.