CVE-2021-0357

Local privilege escalation via unchecked netdiag write

Published Feb 2, 2021 · Updated Aug 3, 2024

Out-of-bounds write in Android 10 and 11 netdiag allows local users with System execution privileges to escalate privileges. The netdiag component writes past a buffer boundary because it does not validate the relevant size before performing the write. Exploitation requires local access with System execution privileges, needs no user interaction, and can elevate execution within the affected device.

CVSS severity6.7
Medium
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in Android 10 and 11 netdiag allows local users with System execution privileges to escalate privileges. The netdiag component writes past a buffer boundary because it does not validate the relevant size before performing the write. Exploitation requires local access with System execution privileges, needs no user interaction, and can elevate execution within the affected device.

The record

CVE
CVE-2021-0357
Published
Feb 2, 2021
Updated
Aug 3, 2024
Vendor
Google Cloud
Product
Android
Classifications
CWE-787, T1068
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Feb 2, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Android-10, Android-11

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Google Cloud · Androidversion=Android-10, Android-11

Published CVSS scores

4.6NIST National Vulnerability DatabaseAV:L/AC:L/Au:N/C:P/I:P/A:P
6.7NIST National Vulnerability DatabaseCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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