How severe is CVE-2021-39655?

CVE-2021-39655 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-39655 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-39655?

CVE-2021-39655 affects Google Android. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-39655?

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

When was CVE-2021-39655 published?

CVE-2021-39655 was published on 2021-12-15 and last updated on 2026-06-17.

CVE-2021-39655

CVE-2021-39655 is a critical-severity vulnerability in Google Android with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 0% (36th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Google Android
Published: 2021-12-15
Last modified: 2026-06-17

Description

Product: AndroidVersions: Android kernelAndroid ID: A-192641593References: N/A

Frequently asked questions

What is CVE-2021-39655?: Product: AndroidVersions: Android kernelAndroid ID: A-192641593References: N/A
How severe is CVE-2021-39655?: CVE-2021-39655 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-39655 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-39655?: CVE-2021-39655 affects Google Android. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-39655?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-39655 published?: CVE-2021-39655 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:-:*:*:*:*:*:*:*

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