What is CVE-2021-25477?

CVE-2021-25477 is a medium-severity vulnerability in Google Android, classified under Double Free. CVSS score: 4.4/10. Published 2021-10-06.

How severe is CVE-2021-25477?

Medium severity. CVSS v3 base score is 4.4 out of 10.

Double Free in Google Android

CVE-2021-25477

An improper error handling in Mediatek RRC Protocol stack prior to SMR Oct-2021 Release 1 allows modem crash and remote denial of service.

Vulnerability class: Double Free

Published 2021-10-06 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.005 (40.2th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 40.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Google Android — versions 9.0, 10.0, 11.0
Mediatek Mt6762
Mediatek Mt6765
Mediatek Mt6853
Samsung Mobile Devices — versions P(9.0), Q(10.0), R(11.0)

Weakness classification (CWE)

CWE-415 — Double Free

References

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

Frequently asked questions

What is CVE-2021-25477?: CVE-2021-25477 is a medium-severity vulnerability in Google Android, classified under Double Free. CVSS score: 4.4/10. Published 2021-10-06.
How severe is CVE-2021-25477?: Medium severity. CVSS v3 base score is 4.4 out of 10.