CVE-2021-40056Network attack vector

Service interruption via unchecked video buffer copy

Published Mar 7, 2022 · Updated Aug 4, 2024

Buffer overflow in Huawei EMUI 10.1.0 and 10.1.1 and Magic UI 3.1.0 and 3.1.1 allows remote attackers to interrupt device service. The video framework copies an input buffer without verifying that the destination can hold its size, causing an out-of-bounds write. No privileges or user interaction are required; the documented consequence is limited to availability loss.

CVSS severity7.5
High
EPSS probability0.74%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in Huawei EMUI 10.1.0 and 10.1.1 and Magic UI 3.1.0 and 3.1.1 allows remote attackers to interrupt device service. The video framework copies an input buffer without verifying that the destination can hold its size, causing an out-of-bounds write. No privileges or user interaction are required; the documented consequence is limited to availability loss.

The record

CVE
CVE-2021-40056
Published
Mar 7, 2022
Updated
Aug 4, 2024
Vendor
MindSpore
Product
EMUI
Classifications
CWE-120, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 7, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.1.0
  2. Affected versionversion=10.1.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

MindSpore · EMUIversion=10.1.0; version=10.1.1
MindSpore · Magic UIversion=3.1.0; version=3.1.1

Published CVSS scores

7.8NIST NVDAV:N/AC:L/Au:N/C:N/I:N/A:C
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1499Endpoint Denial of Service

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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