CVE-2020-0421

HIGH

Google Android - Out-of-Bounds Write

Title source: rule

Description

In appendFormatV of String8.cpp, there is a possible out of bounds write due to incorrect error handling. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android-8.1 Android-9 Android-10 Android-11 Android-8.0Android ID: A-161894517

Exploits (1)

nomisec WORKING POC

by nanopathi · poc

https://github.com/nanopathi/system_core_AOSP10_r33_CVE-2020-0421

View Code ZIP pw:eip

References (1)

[Patch, Vendor Advisory] https://source.android.com/security/bulletin/2020-10-01

Scores

CVSS v3 7.8

EPSS 0.0001

EPSS Percentile 1.9%

Attack Vector LOCAL

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Classification

CWE

CWE-755 CWE-787

Status published

Affected Products (5)

google/android

Timeline

Published Oct 14, 2020

Tracked Since Feb 18, 2026