CVE-2021-0594

Bluetooth pairing consent bypass via CRLF injection

Published Jul 14, 2021 · Updated Aug 3, 2024

CRLF injection in Android 8.1 through 11 allows physically proximate attackers to bypass Bluetooth pairing consent through a crafted NFC message. ConfirmConnectActivity.onCreate displays an unvalidated Bluetooth device name from the NDEF message, allowing embedded CRLF characters to alter the confirmation text. An attacker must bring an NFC payload into range and persuade the user to approve the deceptive prompt; successful exploitation establishes the Bluetooth connection.

CVSS severity8.0
High
EPSS probability1.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

CRLF injection in Android 8.1 through 11 allows physically proximate attackers to bypass Bluetooth pairing consent through a crafted NFC message. ConfirmConnectActivity.onCreate displays an unvalidated Bluetooth device name from the NDEF message, allowing embedded CRLF characters to alter the confirmation text. An attacker must bring an NFC payload into range and persuade the user to approve the deceptive prompt; successful exploitation establishes the Bluetooth connection.

The record

CVE
CVE-2021-0594
Published
Jul 14, 2021
Updated
Aug 3, 2024
Vendor
Google Cloud
Product
Android
Classifications
CWE-74, T1404
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 14, 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-11 Android-8.1 Android-9 Android-10

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

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

Published CVSS scores

8.0NIST NVDCVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
7.9NIST NVDAV:A/AC:M/Au:N/C:C/I:C/A:C

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
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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