CVE-2021-0663

DSP code execution via unchecked IPI length

Published Oct 25, 2021 · Updated Aug 3, 2024

Heap-based buffer overflow in MediaTek audio DSP firmware on Android 9.0 through 11.0 allows local users to execute code on the DSP. The task_common_task_loop handler copies an IPI message payload into the 0x20-byte atod_share field using attacker-controlled param1 without enforcing the field size. Exploitation requires local System execution privileges and no user interaction; successful exploitation executes or hides code in DSP firmware and affects audio processing.

CVSS severity6.7
Medium
EPSS probability0.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in MediaTek audio DSP firmware on Android 9.0 through 11.0 allows local users to execute code on the DSP. The task_common_task_loop handler copies an IPI message payload into the 0x20-byte atod_share field using attacker-controlled param1 without enforcing the field size. Exploitation requires local System execution privileges and no user interaction; successful exploitation executes or hides code in DSP firmware and affects audio processing.

The record

CVE
CVE-2021-0663
Published
Oct 25, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-122, CWE-787, T1068
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Oct 25, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.7NIST NVDCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
7.2NIST NVDAV:L/AC:L/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 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-122Heap-based Buffer Overflow
CWE-787Out-of-bounds Write
T1068Exploitation 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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