CVE-2020-24455

TPM-protected data disclosure via omitted PCR checks

Published Feb 26, 2021 · Updated Aug 4, 2024

Missing initialization in tpm2-tss before 2.4.3 and 3.0.0 allows local users with high privileges to read TPM-protected data. When currentPcrs or currentPcrsAndBank instantiates a PolicyPCR, an uninitialized variable causes the generated policy to omit PCR checks. High-privileged local access is required, and objects created under the faulty policy lack the intended PCR-state restriction.

CVSS severity6.7
Medium
EPSS probability0.58%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing initialization in tpm2-tss before 2.4.3 and 3.0.0 allows local users with high privileges to read TPM-protected data. When currentPcrs or currentPcrsAndBank instantiates a PolicyPCR, an uninitialized variable causes the generated policy to omit PCR checks. High-privileged local access is required, and objects created under the faulty policy lack the intended PCR-state restriction.

The record

CVE
CVE-2020-24455
Published
Feb 26, 2021
Updated
Aug 4, 2024
Vendor
TPM2 Software
Product
TPM2 Software Stack (tpm2-tss)
Classifications
CWE-909, T1068
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Feb 26, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=before 3.01, before 2.4.3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

TPM2 Software · TPM2 Software Stack (tpm2-tss)version=before 3.01, before 2.4.3

Published CVSS scores

6.7NIST NVDCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
4.6NIST NVDAV:L/AC:L/Au:N/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-909Missing Initialization of Resource
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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