What is CVE-2021-1027?

CVE-2021-1027 is a high-severity vulnerability in Google Android, classified under Incorrect Type Conversion or Cast. CVSS score: 7.8/10. Published 2021-12-15.

How severe is CVE-2021-1027?

High severity. CVSS v3 base score is 7.8 out of 10.

Vulnerability in Google Android

CVE-2021-1027

In setTransactionState of SurfaceFlinger, there is possible arbitrary code execution in a privileged process due to improper casting. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android-12Android ID: A-193033243

Published 2021-12-15 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.001 (1.3th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 1st percentile — 1.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: 0.000

Affected products

Google Android — versions 12.0
Android — versions Android-12

Weakness classification (CWE)

CWE-704 — Incorrect Type Conversion or Cast

References

source.android.com/security/bulletin/pixel/2021-12-01 (Vendor Advisory)

Frequently asked questions

What is CVE-2021-1027?: CVE-2021-1027 is a high-severity vulnerability in Google Android, classified under Incorrect Type Conversion or Cast. CVSS score: 7.8/10. Published 2021-12-15.
How severe is CVE-2021-1027?: High severity. CVSS v3 base score is 7.8 out of 10.