CVE-2021-30770Known exploitationPublic exploit

Kernel memory mitigation bypass via undisclosed validation flaw

Published Sep 8, 2021 · Updated Aug 3, 2024

Kernel validation flaw in iOS before 14.7, tvOS before 14.7, and watchOS before 7.6 lets attackers bypass kernel memory mitigations. Apple identifies the locus as the kernel but has not disclosed which validation operation mishandles state or input. Exploitation requires existing kernel code execution and weakens memory protections rather than independently granting initial access or kernel execution.

CVSS severity5.5
Medium
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Kernel validation flaw in iOS before 14.7, tvOS before 14.7, and watchOS before 7.6 lets attackers bypass kernel memory mitigations. Apple identifies the locus as the kernel but has not disclosed which validation operation mishandles state or input. Exploitation requires existing kernel code execution and weakens memory protections rather than independently granting initial access or kernel execution.

The record

CVE
CVE-2021-30770
Published
Sep 8, 2021
Updated
Aug 3, 2024
Vendor
Apple
Product
iOS
Classifications
CWE-287
Attack vector
local
Privileges
admin

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 privilegesadmin

What is affected?

Apple · iOSversion=unspecified <14.7
Apple · tvOSversion=unspecified <14.7
Apple · watchOSversion=unspecified <7.6

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
4.9NIST NVDAV:L/AC:L/Au:N/C:N/I:C/A:N

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
Privilegesadmin
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-287Improper Authentication

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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