What is the CVSS score of CVE-2026-20621?

CVE-2026-20621 has a CVSS 3.1 base score of 5.5 (Medium). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H. EPSS exploitation probability: 0.0%.

Which versions of Apple are affected by CVE-2026-20621?

Organizations using The should be aware of moderate risk from CVE-2026-20621, a buffer overflow vulnerability rated CVSS 5.5. Exploitation could cause memory corruption or application crashes.

How to fix or mitigate CVE-2026-20621?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

Apple CVE-2026-20621

MEDIUM

Buffer Overflow (CWE-119)

2026-02-11 product-security@apple.com

Apple Buffer Overflow

5.5

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

5.5 MEDIUM

AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 22:02 vuln.today

CVE Published

Feb 11, 2026 - 23:16 nvd

MEDIUM 5.5

DescriptionCVE.org

The issue was addressed with improved memory handling. This issue is fixed in macOS Tahoe 26.3, macOS Sonoma 14.8.4, macOS Sequoia 15.7.4, iOS 18.7.5 and iPadOS 18.7.5, visionOS 26.3, iOS 26.3 and iPadOS 26.3. An app may be able to cause unexpected system termination or corrupt kernel memory.

AnalysisAI

Improper memory handling in Apple operating systems (macOS, iOS, iPadOS, visionOS) allows local attackers with user-level privileges to trigger kernel memory corruption or unexpected system crashes without user interaction. The vulnerability affects multiple macOS versions (Tahoe 26.3, Sonoma 14.8.4, Sequoia 15.7.4) and iOS/iPadOS 18.7.5 and later. No patch is currently available for this medium-severity flaw.

Technical ContextAI

Classified as CWE-119 (Buffer Overflow). Affects Ipados. The issue was addressed with improved memory handling. This issue is fixed in macOS Tahoe 26.3, macOS Sonoma 14.8.4, macOS Sequoia 15.7.4, iOS 18.7.5 and iPadOS 18.7.5, visionOS 26.3, iOS 26.3 and iPadOS 26.3. An app may be able to cause unexpected system termination or corrupt kernel memory.