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CVE-2021-30900

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

7.8 HIGHActively exploited (CISA KEV)EPSS 5.20%
  1. Published24 Aug 2021
  2. Added to CISA KEV30 Mar 2023
  3. Remediation due20 Apr 2023
Actively exploited (CISA KEV)

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.

Added to KEV: 30 Mar 2023Federal remediation due: 20 Apr 2023

Description

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 3.1 breakdown

Attack vectorLocal
Attack complexityLow
Privileges requiredNone
User interactionRequired
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

Apple iPadOS< 14.8.1 · 15.0
Apple iPhone OS< 14.8.1 · 15.0
Apple macOS< 11.6.1

Remediation

Fixed in
Apple iPadOS≥ 14.8.1
Apple iPhone OS≥ 14.8.1
Apple macOS≥ 11.6.1

References

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Frequently asked

Is CVE-2021-30900 being actively exploited?

Yes. CVE-2021-30900 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 30 Mar 2023.

How severe is CVE-2021-30900?

CVE-2021-30900 has a CVSS 3.1 base score of 7.8, rated high. EPSS estimates a 5.20% probability of exploitation.

Which products are affected by CVE-2021-30900?

Affected products include Apple iPadOS, Apple iPhone OS, Apple macOS.

How do I fix CVE-2021-30900?

Upgrade affected software to a fixed version, for example Apple iPadOS 14.8.1, Apple iPhone OS 14.8.1, Apple macOS 11.6.1 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2021-30900 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.