What is CVE-2021-0355?

CVE-2021-0355 is a medium-severity vulnerability in Google Android, classified under Integer Overflow or Wraparound. CVSS score: 6.7/10. Published 2021-02-03.

How severe is CVE-2021-0355?

Medium severity. CVSS v3 base score is 6.7 out of 10.

Is CVE-2021-0355 known to be exploited?

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

Integer overflow in Google Android

CVE-2021-0355

In kisd, there is a possible out of bounds write due to an integer overflow. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation. Product: Android; Versions: Android-11; Patch ID: ALPS05425581.

Vulnerability class: Integer Overflow

Published 2021-02-03 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.7 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.002 (3.6th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 4th percentile — 3.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

Google Android — versions 11.0
Android — versions Android-11

Weakness classification (CWE)

CWE-190 — Integer Overflow or Wraparound

Public proof-of-concept exploits

References

corp.mediatek.com/product-security-acknowledgements (Third Party Advisory)

Frequently asked questions

What is CVE-2021-0355?: CVE-2021-0355 is a medium-severity vulnerability in Google Android, classified under Integer Overflow or Wraparound. CVSS score: 6.7/10. Published 2021-02-03.
How severe is CVE-2021-0355?: Medium severity. CVSS v3 base score is 6.7 out of 10.
Is CVE-2021-0355 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.