CVE-2021-0547

Local privilege escalation via unprotected NI broadcast

Published Jun 22, 2021 · Updated Aug 3, 2024

Missing authorization in Android 11 NetInitiatedActivity allows local users to escalate privileges through a crafted NI broadcast. Its onReceive receiver accepts NETWORK_INITIATED_VERIFY and copies an attacker-controlled notif_id into the GPS HAL response path. A local malicious app needs no additional execution privileges or user interaction; resulting behavior depends on the device's HAL implementation.

CVSS severity7.8
High
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in Android 11 NetInitiatedActivity allows local users to escalate privileges through a crafted NI broadcast. Its onReceive receiver accepts NETWORK_INITIATED_VERIFY and copies an attacker-controlled notif_id into the GPS HAL response path. A local malicious app needs no additional execution privileges or user interaction; resulting behavior depends on the device's HAL implementation.

The record

CVE
CVE-2021-0547
Published
Jun 22, 2021
Updated
Aug 3, 2024
Vendor
Google Cloud
Product
Android
Classifications
CWE-862, T1404
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 22, 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?

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  1. Affected versionversion=Android-11

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Google Cloud · Androidversion=Android-11

Published CVSS scores

7.8NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.6NVDAV:L/AC:L/Au:N/C:P/I:P/A:P

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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization
T1404Exploitation 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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