CVE-2021-30748

Kernel code execution via AVEVideoEncoder memory corruption

Published Sep 8, 2021 · Updated Aug 3, 2024

Memory corruption in AVEVideoEncoder in Apple iOS before 14.7 and macOS before 11.5 allows local users to execute arbitrary code with kernel privileges. The encoder’s state-management path mishandles memory, allowing a malicious application to trigger corruption and obtain kernel-level code execution. Exploitation requires running an application on the affected device; the resulting impact includes complete code execution in the kernel context.

CVSS severity7.8
High
EPSS probability1.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in AVEVideoEncoder in Apple iOS before 14.7 and macOS before 11.5 allows local users to execute arbitrary code with kernel privileges. The encoder’s state-management path mishandles memory, allowing a malicious application to trigger corruption and obtain kernel-level code execution. Exploitation requires running an application on the affected device; the resulting impact includes complete code execution in the kernel context.

The record

CVE
CVE-2021-30748
Published
Sep 8, 2021
Updated
Aug 3, 2024
Vendor
Apple
Product
iOS
Classifications
CWE-787, 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

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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=unspecified <14.7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Apple · iOSversion=unspecified <14.7
Apple · macOSversion=unspecified <11.5

Published CVSS scores

7.8NISTCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
9.3NISTAV:N/AC:M/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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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