CVE-2026-20621

System crash via undisclosed Wi-Fi memory handling

Published Feb 11, 2026 · Updated Feb 11, 2026

Memory corruption in Wi-Fi on affected iOS, iPadOS, macOS, and visionOS releases allows local users to crash the system or corrupt kernel memory. Apple identifies the locus only as Wi-Fi and has not disclosed the faulty memory operation or the input that triggers it. Execution of a local app is required; reported outcomes are system termination or kernel-memory corruption, with no disclosed data access or privilege gain.

CVSS severity5.5
Medium
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in Wi-Fi on affected iOS, iPadOS, macOS, and visionOS releases allows local users to crash the system or corrupt kernel memory. Apple identifies the locus only as Wi-Fi and has not disclosed the faulty memory operation or the input that triggers it. Execution of a local app is required; reported outcomes are system termination or kernel-memory corruption, with no disclosed data access or privilege gain.

The record

CVE
CVE-2026-20621
Published
Feb 11, 2026
Updated
Feb 11, 2026
Vendor
Apple
Product
iOS and iPadOS
Classifications
CWE-119, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 11, 2026Record 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 <18.7
  2. Affected versionversion=unspecified <26.3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Apple · iOS and iPadOSversion=unspecified <18.7; version=unspecified <26.3
Apple · visionOSversion=unspecified <26.3
Apple · macOSversion=unspecified <14.8; version=unspecified <15.7; version=unspecified <26.3

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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

Technologies

Your stack

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Your stack

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