CISA KEV · Known exploitedHigh

CVE-2021-30900

Apple iOS, iPadOS, and macOS

An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 14.8.1 and iPadOS 14.8.1, iOS 15.1 and iPadOS 15.1. A malicious application may be able to execute arbitrary code with kernel privileges.

CVSS
7.8
EPSS
5.20%
91.7% percentile
CISA KEV
Listed
Published
2021.08.25
PRIORITY ASSESSMENT

Immediate review

CISA has listed this vulnerability in the Known Exploited Vulnerabilities catalog.

Known exploitationConfirmed by CISA KEV
Exploit probability5.20%
Technical severityCVSS 7.8

Vulnerability overview

An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 14.8.1 and iPadOS 14.8.1, iOS 15.1 and iPadOS 15.1. A malicious application may be able to execute arbitrary code with kernel privileges.

Affected product and versions

Product
Apple iOS, iPadOS, and macOS
Affected versions
unspecified, < 14.8.1, 15.0, < 11.6.1
Fixed versions
14.8.1, 11.6.1

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
CISA required action

Apply updates per vendor instructions.

Due date: 2023.04.20
  1. 1
    Identify

    Confirm that Apple iOS, iPadOS, and macOS and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE
CWE-20, CWE-787
KEV added
2023.03.30
Ransomware use
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