CVE-2021-39680

Name: CVE-2021-39680
Creator: NVD / NIST
Published: 2022-01-14T20:15:11.427+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.4/10EPSS 0.12%

Last modified Jun 17, 2026

CVE-2021-39680 is a medium-severity vulnerability rated 4.4/10 on the CVSS scale. In sec_SHA256_Transform of sha256_core.c, there is a possible way to read heap data due to uninitialized data. This could lead to local information disclosure with System execution privileges needed. EPSS estimates a 0.12% chance of exploitation in the next 30 days.

Description

In sec_SHA256_Transform of sha256_core.c, there is a possible way to read heap data due to uninitialized data. This could lead to local information disclosure with System execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-197965864References: N/A

Metrics

CVSS 3.1

4.4/10

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

EPSS Probability

0.12%

1.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-908

Affected Software

Vendor	Product	Versions
Google	Android	All versions

References

https://source.android.com/security/bulletin/pixel/2022-01-01Vendor Advisory
https://source.android.com/security/bulletin/pixel/2022-01-01Vendor Advisory

Timeline

Published: Jan 14, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-39680?

How severe is CVE-2021-39680?

CVE-2021-39680 has a CVSS score of 4.4/10 (MEDIUM severity). The EPSS model estimates a 0.12% probability of exploitation in the next 30 days.

How do I fix CVE-2021-39680?

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-2021-39680?

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

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Source: NVD / NIST