CVE-2021-0870Network attack vector

Remote code execution via NFC state race

Published Oct 22, 2021 · Updated Aug 3, 2024

Remote code execution in Android's System component in Android 8.1 through 11 allows remote attackers to execute code via crafted transmissions. RW_SetActivatedTagType in rw_main.cc races while changing activated NFC tag state, allowing shared state to become corrupted in memory. No privileges or user interaction are required; successful exploitation executes arbitrary code in a privileged process on a reachable device.

CVSS severity8.1
High
EPSS probability7.01%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Remote code execution in Android's System component in Android 8.1 through 11 allows remote attackers to execute code via crafted transmissions. RW_SetActivatedTagType in rw_main.cc races while changing activated NFC tag state, allowing shared state to become corrupted in memory. No privileges or user interaction are required; successful exploitation executes arbitrary code in a privileged process on a reachable device.

The record

CVE
CVE-2021-0870
Published
Oct 22, 2021
Updated
Aug 3, 2024
Vendor
Google Cloud
Product
Android
Classifications
CWE-362, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 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?

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

  1. Affected versionversion=Android-9 Android-10 Android-11 Android-8.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Google Cloud · Androidversion=Android-9 Android-10 Android-11 Android-8.1

Published CVSS scores

9.3NIST NVDAV:N/AC:M/Au:N/C:C/I:C/A:C
8.1NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
T1203Exploitation for Client Execution

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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