CVE-2021-0544

Local privilege escalation via oversized NFC response copy

Published Jun 22, 2021 · Updated Aug 3, 2024

Out-of-bounds write in Android 11's NXP NFC HAL allows local users with System privileges to escalate privileges without interaction. The phNxpNciHal_print_res_status clock-response branch copies the reported receive length into the fixed phNxpNciClock.p_rx_data buffer without capping it to the destination size. Exploitation requires existing System execution privileges and an oversized NFC controller response; user interaction is not required.

CVSS severity6.7
Medium
EPSS probability0.12%
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 11's NXP NFC HAL allows local users with System privileges to escalate privileges without interaction. The phNxpNciHal_print_res_status clock-response branch copies the reported receive length into the fixed phNxpNciClock.p_rx_data buffer without capping it to the destination size. Exploitation requires existing System execution privileges and an oversized NFC controller response; user interaction is not required.

The record

CVE
CVE-2021-0544
Published
Jun 22, 2021
Updated
Aug 3, 2024
Vendor
Google Cloud
Product
Android
Classifications
CWE-787, T1404
Attack vector
local
Privileges
admin

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 privilegesadmin

What is affected?

Google Cloud · Androidversion=Android-11

Published CVSS scores

4.6NIST NVDAV:L/AC:L/Au:N/C:P/I:P/A:P
6.7NIST NVDCVSS: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.

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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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1404Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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