How severe is CVE-2023-21066?

CVE-2023-21066 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-2023-21066 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (40th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-21066?

CVE-2023-21066 affects Google Android. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-21066?

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-2023-21066 published?

CVE-2023-21066 was published on 2023-06-28 and last updated on 2026-06-17.

CVE-2023-21066

CVE-2023-21066 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. The underlying weakness is classified as CWE-787.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (40th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-787
Affected product: Google Android
Published: 2023-06-28
Last modified: 2026-06-17

Description

In cd_CodeMsg of cd_codec.c, there is a possible out of bounds write due to a heap buffer overflow. This could lead to remote code execution with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-250100597References: N/A

Frequently asked questions

What is CVE-2023-21066?: In cd_CodeMsg of cd_codec.c, there is a possible out of bounds write due to a heap buffer overflow. This could lead to remote code execution with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-250100597References: N/A
How severe is CVE-2023-21066?: CVE-2023-21066 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-2023-21066 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (40th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-21066?: CVE-2023-21066 affects Google Android. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-21066?: 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-2023-21066 published?: CVE-2023-21066 was published on 2023-06-28 and last updated on 2026-06-17.

References

https://source.android.com/security/bulletin/pixel/2023-06-01

Affected products (1)

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

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