How severe is CVE-2021-39643?

CVE-2021-39643 has a CVSS 3.x base score of 6.7, rated medium severity. It is exploitable over local access with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-39643 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (2nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-39643?

CVE-2021-39643 affects Google Android. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-39643?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-39643 published?

CVE-2021-39643 was published on 2021-12-15 and last updated on 2026-06-17.

CVE-2021-39643

CVE-2021-39643 is a medium-severity vulnerability in Google Android with a CVSS 3.x base score of 6.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-252.

Key facts

Severity: Medium (CVSS 3.x base score 6.7)
CVSS v2: 4.6
EPSS exploit prediction: 0% (2nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-252
Affected product: Google Android
Published: 2021-12-15
Last modified: 2026-06-17

Description

In ic_startRetrieveEntryValue of acropora/app/identity/ic.c, there is a possible bypass of defense-in-depth due to missing validation of the return value. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-195573629References: N/A

Frequently asked questions

What is CVE-2021-39643?: In ic_startRetrieveEntryValue of acropora/app/identity/ic.c, there is a possible bypass of defense-in-depth due to missing validation of the return value. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-195573629References: N/A
How severe is CVE-2021-39643?: CVE-2021-39643 has a CVSS 3.x base score of 6.7, rated medium severity. It is exploitable over local access with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-39643 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (2nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-39643?: CVE-2021-39643 affects Google Android. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-39643?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-39643 published?: CVE-2021-39643 was published on 2021-12-15 and last updated on 2026-06-17.

References

https://source.android.com/security/bulletin/pixel/2021-12-01

Affected products (1)

cpe:2.3:o:google:android:-:*:*:*:*:*:*:*

More vulnerabilities in Google Android

CVE-2026-0092 — Critical (CVSS 10.0): In Package Manager, there is a possible device lock controller bypass due to a missing permission check. This could…
CVE-2025-48611 — Critical (CVSS 10.0): In DeviceId of DeviceId.java, there is a possible desync in persistence due to a missing bounds check. This could lead…
CVE-2015-8073 — Critical (CVSS 10.0): mediaserver in Android 4.4 and 5.1 before 5.1.1 LMY48X allows remote attackers to execute arbitrary code or cause a…
CVE-2015-8072 — Critical (CVSS 10.0): mediaserver in Android 4.4 through 5.x before 5.1.1 LMY48X and 6.0 before 2015-11-01 allows remote attackers to execute…
CVE-2015-6610 — Critical (CVSS 10.0): libstagefright in Android before 5.1.1 LMY48X and 6.0 before 2015-11-01 allows attackers to gain privileges or cause a…
CVE-2015-6609 — Critical (CVSS 10.0): libutils in Android before 5.1.1 LMY48X and 6.0 before 2015-11-01 allows remote attackers to execute arbitrary code or…

All CVEs affecting Google Android →

Other CWE-252 vulnerabilities

CVE-2025-66565 — Critical (CVSS 9.8): Fiber Utils is a collection of common functions created for Fiber. In versions 2.0.0-rc.3 and below, when the system's…
CVE-2021-38171 — Critical (CVSS 9.8): adts_decode_extradata in libavformat/adtsenc.c in FFmpeg 4.4 does not check the init_get_bits return value, which is a…
CVE-2021-26955 — Critical (CVSS 9.8): An issue was discovered in the xcb crate through 2021-02-04 for Rust. It has a soundness violation because…
CVE-1999-0199 — Critical (CVSS 9.8): manual/search.texi in the GNU C Library (aka glibc) before 2.2 lacks a statement about the unspecified tdelete return…
CVE-2019-15900 — Critical (CVSS 9.8): An issue was discovered in slicer69 doas before 6.2 on certain platforms other than OpenBSD. On platforms without…
CVE-2010-0211 — Critical (CVSS 9.8): The slap_modrdn2mods function in modrdn.c in OpenLDAP 2.4.22 does not check the return value of a call to the…

Browse all CWE-252 vulnerabilities →