CVE-2021-0996

Information disclosure via unchecked NFC event length

Published Dec 15, 2021 · Updated Aug 3, 2024

Out-of-bounds read in Android 12 NFC System code allows attackers with System privileges to disclose local memory over NFC. The nfaHciCallback function trusted the transaction event's AID length and sliced the received event buffer without first proving that the requested range fit inside it. Exploitation requires System execution privileges and NFC access, needs no user interaction, and is limited to information disclosure.

CVSS severity4.5
Medium
EPSS probability0.16%
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 read in Android 12 NFC System code allows attackers with System privileges to disclose local memory over NFC. The nfaHciCallback function trusted the transaction event's AID length and sliced the received event buffer without first proving that the requested range fit inside it. Exploitation requires System execution privileges and NFC access, needs no user interaction, and is limited to information disclosure.

The record

CVE
CVE-2021-0996
Published
Dec 15, 2021
Updated
Aug 3, 2024
Vendor
Google Cloud
Product
Android
Classifications
CWE-125, CAPEC-540, T1532
Attack vector
adjacent
Privileges
admin

Timeline

How it unfolded

  1. Dec 15, 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-12

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesadmin

What is affected?

Google Cloud · Androidversion=Android-12

Published CVSS scores

2.7NVDAV:A/AC:L/Au:S/C:P/I:N/A:N
4.5NVDCVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N

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)
Vectoradjacent
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
CAPEC-540Overread Buffers
T1532Data from Local System

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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