CVE-2021-0435Network attack vector

Remote heap disclosure via uninitialized AVRCP responses

Published Apr 13, 2021 · Updated Aug 3, 2024

Improper initialization in Android 8.1 through 11 allows remote attackers to read heap data through a crafted Bluetooth AVRCP command. In avrc_proc_vendor_command in stack/avrc/avrc_api.cc, AVRCP response buffers allocated without zeroing retain reserved bytes that are returned remotely. No authentication or user interaction is required, and exposure is limited to process heap contents; no integrity or availability impact is reported.

CVSS severity7.5
High
EPSS probability1.71%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper initialization in Android 8.1 through 11 allows remote attackers to read heap data through a crafted Bluetooth AVRCP command. In avrc_proc_vendor_command in stack/avrc/avrc_api.cc, AVRCP response buffers allocated without zeroing retain reserved bytes that are returned remotely. No authentication or user interaction is required, and exposure is limited to process heap contents; no integrity or availability impact is reported.

The record

CVE
CVE-2021-0435
Published
Apr 13, 2021
Updated
Aug 3, 2024
Vendor
Google Cloud
Product
Android
Classifications
CWE-665
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 13, 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 vectornetwork
Required privilegesunauthenticated

What is affected?

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

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
5.0NIST NVDAV:N/AC:L/Au:N/C:P/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.

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-665Improper Initialization

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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