Apple iOS, iPadOS, and macOS Out-of-Bounds Write Vulnerability

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

• cpe apple/ipados15.0
• cpe apple/iphone os15.0
• cpe apple/macosversion unspecified
• vendor Apple iOS, iPadOS, and macOSversion unspecified

How to fix CVE-2021-30900

• Recommended remediation

  Apply updates per vendor instructions. CISA due date Apr 20, 2023.

• Official advisories

  • CISA KEV · cisa.gov
  • CVE.org · cve.org
  • FIRST EPSS · first.org
  • NIST NVD · nvd.nist.gov
  • VulnCheck KEV · vulncheck.com

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

1. Aug 24, 2021 · Catalog

   Detected

   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.

2. Mar 30, 2023 · CISA KEV

   Known exploited

   Apply updates per vendor instructions.

3. Apr 20, 2023 · CISA KEV

   Remediation due

   Apply updates per vendor instructions.

4. Jun 16, 2026 · Catalog

   Updated

   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.

Sources

• CISA KEVConfirmed exploitationCVE-2021-30900

  Apple GPU drivers, included in iOS, iPadOS, and macOS, contain an out-of-bounds write vulnerability that may allow a malicious application to execute code with kernel privileges.

  cisa.gov
• CVE.orgVulnerability recordCVE-2021-30900

  Official CVE identifier

  cve.org
• FIRST EPSSExploitation probabilityCVE-2021-30900

  30-day exploitation probability 5.2%

  first.org
• NIST NVDVulnerability recordCVE-2021-30900

  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.

  nvd.nist.gov
• VulnCheck KEVConfirmed exploitationCVE-2021-30900

  Apple GPU drivers, included in iOS, iPadOS, and macOS, contain an out-of-bounds write vulnerability that may allow a malicious application to execute code with kernel privileges.

  vulncheck.com

References

• VulnCheck exploitation evidence · blog.google
• CISA note · nvd.nist.gov
• CISA note · support.apple.com
• Vendor Advisory · support.apple.com
• CISA note · support.apple.com
• CISA note · support.apple.com
• US Government Resource · cisa.gov
• VulnCheck exploitation evidence · cisa.gov

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.