What is CVE-2026-21020?

CVE-2026-21020 is a high-severity vulnerability in Samsung Android, classified under CWE-926: IMPROPER EXPORT OF ANDROID APPLICATION COMPONENTS. CVSS score: 7.8/10. Published 2026-05-13.

How severe is CVE-2026-21020?

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

Is CVE-2026-21020 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Samsung Android

CVE-2026-21020

Improper export of android application components in OmaCP prior to SMR May-2026 Release 1 allows local attackers to trigger privileged functions.

Published 2026-05-13 · 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 (0.6th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 1st percentile — 0.6% 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

Samsung Android — versions 14.0, 15.0, 16.0
Samsung Mobile Devices — versions SMR May-2026 Release in Android 14, 15, 16

Public proof-of-concept exploits

George0Papasotiriou/CVE-2026-21020-Protobuf-Message-Parsing-Polymorphic-Deserialization-Vulnerability

References

security.samsungmobile.com/securityUpdate.smsb (Vendor Advisory)

Frequently asked questions

What is CVE-2026-21020?: CVE-2026-21020 is a high-severity vulnerability in Samsung Android, classified under CWE-926: IMPROPER EXPORT OF ANDROID APPLICATION COMPONENTS. CVSS score: 7.8/10. Published 2026-05-13.
How severe is CVE-2026-21020?: High severity. CVSS v3 base score is 7.8 out of 10.
Is CVE-2026-21020 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.