CVE-2020-0421
In appendFormatV of String8.cpp, there is a possible out of bounds write due to incorrect error...
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
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
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
- Record
CVE-2020-0421- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 7.2 High
AV:L/AC:L/Au:N/C:C/I:C/A:C - Weakness
- CWE-755, CWE-787
- Updated
- 2026-11-02
CVE List No score
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
- Record
CVE-2020-0421- Updated
- 2026-11-02
EUVDEUVD-2020-1923 No score
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
- Record
EUVD-2020-1923- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-29fp-7w52-3694 No score
In appendFormatV of String8.cpp, there is a possible out of bounds write due to incorrect error...
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
- Record
GHSA-29fp-7w52-3694- Weakness
- CWE-755
- Updated
- 2026-11-02
OSVASB-A-161894517 No score
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.
- Record
ASB-A-161894517- Updated
- 2026-11-05
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
platform/system/coreAndroid |
8.0:0 up to 8.0:2020-10-01, plus listed versions 8.0 |
8.0:2020-10-01 |
platform/system/coreAndroid |
8.1:0 up to 8.1:2020-10-01, plus listed versions 8.1 |
8.1:2020-10-01 |
platform/system/coreAndroid |
9:0 up to 9:2020-10-01, plus listed versions 9 |
9:2020-10-01 |
platform/system/coreAndroid |
10:0 up to 10:2020-10-01, plus listed versions 10 |
10:2020-10-01 |
platform/system/coreAndroid |
11:0 up to 11:2020-10-01, plus listed versions 11 |
11:2020-10-01 |
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| PoC in GitHub | nanopathi/system_core_AOSP10_r33_CVE-2020-0421 | 2022-03-31 |
History
| Recorded | Changed | Sources |
|---|---|---|
| facts | OSV | |
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV, PoC in GitHub |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2020-0421 is a high vulnerability (CVSS 7.8) in Google Android, published October 1, 2020. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 0.27%, the 18th percentile. Fixed in platform/system/core 8.0:2020-10-01.