Is CVE-2018-4344 being actively exploited?

Yes. CVE-2018-4344 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added on June 27, 2022.

What is the CVSS score for CVE-2018-4344?

CVE-2018-4344 has a CVSS 3.1 base score of 7.8 (HIGH).

CVE-2018-4344

HIGH · CVSS 7.8CISA KEV: actively exploitedEPSS 2.4%EU EUVD: exploited

A memory corruption issue was addressed with improved memory handling. This issue affected versions prior to iOS 12, macOS Mojave 10.14, tvOS 12, watchOS 5.

Key facts

CVSS score: 7.8 (v3.1)
Severity: HIGH
CVSS vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-119
EPSS score: 2.4% (84th percentile)
In CISA KEV: Yes, added June 27, 2022
In EU EUVD: Yes (EUVD-2018-16130)
Published: April 3, 2019
NVD last modified: June 17, 2026
Status: Analyzed

CISA Known Exploited Vulnerability

Apple Multiple Products Memory Corruption Vulnerability

Added to the KEV catalog on June 27, 2022; federal remediation due July 18, 2022.

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2018-16130 in the EU Vulnerability Database. ENISA flags it as known exploited. Last updated in EUVD on October 21, 2025.

View on the EU Vulnerability Database

Affected products

apple / iphone os
apple / mac os x
apple / tvos
apple / watchos

Certified products that may be affected

2 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.

Apple Mac OS X 10.6 - Apple Inc. - Common Criteria BSI-DSZ-CC-0536-2010 - archived
Apple Mac OS X v10.3.6 and Apple Mac OS X Server V10.3.6 - Apple Inc. - Common Criteria CCEVS-VR-0086-2005 - archived

References

https://support.apple.com/kb/HT209106(Release Notes, Vendor Advisory)
https://support.apple.com/kb/HT209107(Release Notes, Vendor Advisory)
https://support.apple.com/kb/HT209108(Release Notes, Vendor Advisory)
https://support.apple.com/kb/HT209139(Release Notes, Vendor Advisory)
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-4344(US Government Resource)

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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