CVE-2021-22418

Privilege escalation via AOD driver integer overflow

Published Aug 3, 2021 · Updated Aug 3, 2024

Integer overflow in the AOD driver in Huawei HarmonyOS 2.0 allows local users to overwrite memory and escalate privileges. The driver fails to reject arithmetic that exceeds the integer range, so a wrapped value permits an out-of-bounds memory write. Exploitation requires local low-privileged access; Huawei reports root-level escalation, but the public record does not identify the affected function.

CVSS severity7.8
High
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in the AOD driver in Huawei HarmonyOS 2.0 allows local users to overwrite memory and escalate privileges. The driver fails to reject arithmetic that exceeds the integer range, so a wrapped value permits an out-of-bounds memory write. Exploitation requires local low-privileged access; Huawei reports root-level escalation, but the public record does not identify the affected function.

The record

CVE
CVE-2021-22418
Published
Aug 3, 2021
Updated
Aug 3, 2024
Vendor
Huawei Technologies Co., Ltd.
Product
HarmonyOS
Classifications
CWE-190, T1404
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 3, 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=2.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Huawei Technologies Co., Ltd. · HarmonyOSversion=2.0

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
T1404Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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