Is CVE-2026-20637 in the CISA KEV catalog?

No. CVE-2026-20637 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-20637?

CVE-2026-20637 has a CVSS v3 base score of 6.2 (MEDIUM).

What is the EPSS score for CVE-2026-20637?

CVE-2026-20637 has an EPSS score of 0.20% (10th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-20637?

Update iOS to 18.7.7 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2026-20637

MEDIUM

6.2

CVSS v3

NVD

Description

A use after free issue was addressed with improved memory management. This issue is fixed in iOS 18.7.7 and iPadOS 18.7.7, iOS 26.3 and iPadOS 26.3, macOS Sequoia 15.7.5, macOS Sonoma 14.8.5, macOS Tahoe 26.3, tvOS 26.3, visionOS 26.3, watchOS 26.3. An app may be able to cause unexpected system termination.

CWE-416Use After Free

How to fix

Remediation Available

iOSApple

Fixed in:18.7.7126793

Fixed in:26.3126346

macOS SequoiaApple

Fixed in:15.7.5126795

macOS SonomaApple

Fixed in:14.8.5126796

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

0.20%probability of exploitation in 30 days

10thpercentile

Low risk: more likely to be exploited than 10% of all known CVEs.

References

Vendor Advisory8

Related Vulnerabilities

Other CWE-416 (Use After Free) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2019-0708	Critical	9.8	100%	KEV + Ransom	-
CVE-2021-31166	Critical	9.8	100%	KEV	Fix
CVE-2015-5119	Critical	9.8	99%	KEV	-
CVE-2010-3962	High	8.1	97%	KEV	-
CVE-2015-0313	Critical	9.8	96%	KEV	Fix
CVE-2017-9798	High	7.5	95%	-	Fix

Embed a live status badge for CVE-2026-20637

Markdown

[![CVE-2026-20637](https://tridentstack.com/cve/badge/CVE-2026-20637.svg)](https://tridentstack.com/cve/CVE-2026-20637)

HTML

<a href="https://tridentstack.com/cve/CVE-2026-20637"><img src="https://tridentstack.com/cve/badge/CVE-2026-20637.svg" alt="CVE-2026-20637"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-03-25.