What is CVE-2018-9521?

CVE-2018-9521 is a high-severity vulnerability in Google Android, classified under Out-of-bounds Write. CVSS score: 8.8/10. Published 2018-11-14.

How severe is CVE-2018-9521?

High severity. CVSS v3 base score is 8.8 out of 10.

Buffer overflow in Google Android

CVE-2018-9521

In parseMPEGCCData of NuPlayer2CCDecoder.cpp, there is a possible out of bounds write due to an incorrect bounds check. This could lead to remote code execution in an unprivileged process with no additional execution privileges needed. User interaction is needed for exploitation. Product: Android. Versions: Android-9. Android ID: A-111874331

Vulnerability class: Buffer Overflow

Published 2018-11-14 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.015 (74.0th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 74th percentile — 74.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.015 · newest: 0.015 · change: 0.000

Affected products

Google Android — versions 9.0
Google Inc. Android — versions Android-9

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

www.securityfocus.com/bid/105865 (VDB Entry, Third Party Advisory, vdb-entry)
source.android.com/security/bulletin/2018-11-01 (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2018-9521?: CVE-2018-9521 is a high-severity vulnerability in Google Android, classified under Out-of-bounds Write. CVSS score: 8.8/10. Published 2018-11-14.
How severe is CVE-2018-9521?: High severity. CVSS v3 base score is 8.8 out of 10.