CVE-2021-39997Public exploitNetwork attack vector

Out-of-bounds access via unchecked audio parameters

Published Feb 9, 2022 · Updated Aug 4, 2024

Improper input validation in Huawei EMUI 12.0.0's VprTa audio component allows remote attackers to cause out-of-bounds memory access. GmmLoadModels accepts an unchecked model type, while InitGetScoreParams uses an unchecked feature count in an allocation calculation and GmmGetScore dereferences an unchecked result. The commands receive parameters from a normal-world client application, and demonstrated proofs of concept crash the trusted application.

CVSS severity9.8
Critical
EPSS probability0.80%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Huawei EMUI 12.0.0's VprTa audio component allows remote attackers to cause out-of-bounds memory access. GmmLoadModels accepts an unchecked model type, while InitGetScoreParams uses an unchecked feature count in an allocation calculation and GmmGetScore dereferences an unchecked result. The commands receive parameters from a normal-world client application, and demonstrated proofs of concept crash the trusted application.

The record

CVE
CVE-2021-39997
Published
Feb 9, 2022
Updated
Aug 4, 2024
Vendor
MindSpore
Product
EMUI
Classifications
CWE-20, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 9, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 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?

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  1. Affected versionversion=12.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

MindSpore · EMUIversion=12.0.0

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-20Improper Input Validation
T1499.004Application or System Exploitation

Public exploit references

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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