CVE-2021-30714Public exploit

Kernel-memory write or system crash via AVE race

Published Sep 8, 2021 · Updated Aug 3, 2024

A race condition in AVEVideoEncoder in Apple iOS and iPadOS before 14.6 allows local users to crash the system or write kernel memory. Two AppleAVE2Driver user clients race shared surface and command-buffer state, allowing list pointers to be redirected into attacker-controlled IOSurface memory. Execution requires a locally installed application and user interaction; the published proof of concept constructs kernel-memory access primitives.

CVSS severity6.3
Medium
EPSS probability0.51%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A race condition in AVEVideoEncoder in Apple iOS and iPadOS before 14.6 allows local users to crash the system or write kernel memory. Two AppleAVE2Driver user clients race shared surface and command-buffer state, allowing list pointers to be redirected into attacker-controlled IOSurface memory. Execution requires a locally installed application and user interaction; the published proof of concept constructs kernel-memory access primitives.

The record

CVE
CVE-2021-30714
Published
Sep 8, 2021
Updated
Aug 3, 2024
Vendor
Apple
Product
iOS and iPadOS
Classifications
CWE-362, T1068
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 8, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=unspecified <14.6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Apple · iOS and iPadOSversion=unspecified <14.6

Published CVSS scores

4.0NIST NVDAV:N/AC:H/Au:N/C:N/I:P/A:P
6.3NIST NVDCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:H/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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
T1068Exploitation for Privilege Escalation

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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