How severe is CVE-2021-39802?

CVE-2021-39802 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-39802 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-39802?

CVE-2021-39802 affects Google Android. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-39802?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-39802 published?

CVE-2021-39802 was published on 2022-04-12 and last updated on 2026-06-17.

CVE-2021-39802

CVE-2021-39802 is a high-severity vulnerability in Google Android with a CVSS 3.x base score of 7.8. 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-863.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v2: 7.2
EPSS exploit prediction: 0% (4th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-863
Affected product: Google Android
Published: 2022-04-12
Last modified: 2026-06-17

Description

In change_pte_range of mprotect.c , there is a possible way to make a shared mmap writable due to a permissions bypass. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-213339151References: Upstream kernel

Frequently asked questions

What is CVE-2021-39802?: In change_pte_range of mprotect.c , there is a possible way to make a shared mmap writable due to a permissions bypass. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-213339151References: Upstream kernel
How severe is CVE-2021-39802?: CVE-2021-39802 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-39802 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-39802?: CVE-2021-39802 affects Google Android. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-39802?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-39802 published?: CVE-2021-39802 was published on 2022-04-12 and last updated on 2026-06-17.

References

https://source.android.com/security/bulletin/2022-04-01

Affected products (1)

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

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