CVE-2023-21190

Information disclosure via undropped Bluetooth encryption downgrade

Published Jun 28, 2023 · Updated Dec 4, 2024

Information disclosure in Android 13 allows remote attackers to expose local data by disabling Bluetooth link encryption. The btm_acl_encrypt_change function accepts an encryption-disable event for an encrypted ACL link without terminating the connection, allowing traffic to continue after link-layer protection drops. Exploitation requires user interaction and a connected Bluetooth peer; the specific local information exposed by the downgraded link is not publicly identified.

CVSS severity5.0
Medium
EPSS probability0.08%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Android 13 allows remote attackers to expose local data by disabling Bluetooth link encryption. The btm_acl_encrypt_change function accepts an encryption-disable event for an encrypted ACL link without terminating the connection, allowing traffic to continue after link-layer protection drops. Exploitation requires user interaction and a connected Bluetooth peer; the specific local information exposed by the downgraded link is not publicly identified.

The record

CVE
CVE-2023-21190
Published
Jun 28, 2023
Updated
Dec 4, 2024
Vendor
Google Cloud
Product
Android
Classifications
Unavailable
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Jun 28, 2023CVE publishedPublication date reported by the CVE source.
  2. Dec 4, 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-13

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

Google Cloud · Androidversion=Android-13

Published CVSS scores

5.0NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:R/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)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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