CVE-2021-39680
In sec_SHA256_Transform of sha256_core.c, there is a possible way to read heap data due to...
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
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- High
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- None
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
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
- Record
CVE-2021-39680- CVSS 3.1
- 4.4 Medium
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N - CVSS 2.0
- 2.1 Low
AV:L/AC:L/Au:N/C:P/I:N/A:N - Weakness
- CWE-908
- Updated
- 2026-11-02
CVE List No score
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
- Record
CVE-2021-39680- Updated
- 2026-11-02
EUVDEUVD-2021-26037 No score
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
- Record
EUVD-2021-26037- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-6jfc-jv5m-vxv3 No score
In sec_SHA256_Transform of sha256_core.c, there is a possible way to read heap data due to...
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
- Record
GHSA-6jfc-jv5m-vxv3- Weakness
- CWE-908
- Updated
- 2026-11-02
OSVPUB-A-197965864 No score
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.
- Record
PUB-A-197965864- Updated
- 2026-11-09
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
:unknown:Android |
Pixel-family specific:0 up to Pixel-family specific:2022-01-05, plus listed versions Pixel-family specific |
Pixel-family specific:2022-01-05 |
History
| Recorded | Changed | Sources |
|---|---|---|
| facts | OSV | |
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-39680 is a medium vulnerability (CVSS 4.4) in Google Android, published January 1, 2022. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.12%, the 1st percentile. Fixed in :unknown: Pixel-family specific:2022-01-05.