CVE-2021-39639

Name: CVE-2021-39639
Creator: NVD / NIST
Published: 2021-12-15T19:15:15.133+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.8/10EPSS 0.13%

Last modified Jun 17, 2026

CVE-2021-39639 is a medium-severity vulnerability rated 6.8/10 on the CVSS scale. In TBD of fvp.c, there is a possible way to glitch CPU behavior due to a missing permission check. This could lead to local escalation of privilege with physical access to device internals with no additional execution privileges needed. EPSS estimates a 0.13% chance of exploitation in the next 30 days.

Description

In TBD of fvp.c, there is a possible way to glitch CPU behavior due to a missing permission check. This could lead to local escalation of privilege with physical access to device internals with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-198291476References: N/A

Metrics

CVSS 3.1

6.8/10

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

EPSS Probability

0.13%

2.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-862

Affected Software

Vendor	Product	Versions
Google	Android	All versions

References

https://source.android.com/security/bulletin/pixel/2021-12-01Patch, Vendor Advisory
https://source.android.com/security/bulletin/pixel/2021-12-01Patch, Vendor Advisory

Timeline

Published: Dec 15, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-39639?

How severe is CVE-2021-39639?

CVE-2021-39639 has a CVSS score of 6.8/10 (MEDIUM severity). The EPSS model estimates a 0.13% probability of exploitation in the next 30 days.

How do I fix CVE-2021-39639?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-39639?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST