How severe is CVE-2018-4344?

CVE-2018-4344 has a CVSS score of 7.8/10, rated HIGH. Immediate patching is strongly recommended.

Which packages are affected by CVE-2018-4344?

Affected package information for CVE-2018-4344 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2018-4344?

No fixed version has been published for CVE-2018-4344 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is CVE-2018-4344 actively exploited in the wild?

Yes. There are 1 known exploit references for CVE-2018-4344, including 1 in-the-wild exploitation observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

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

CVE-2018-4344 has an EPSS (Exploit Prediction Scoring System) score of 0.2%, placing it in the 39th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

Is CVE-2018-4344 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2018-4344 (Apple Multiple Products Memory Corruption Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2022-06-27. CISA required all US federal civilian agencies to remediate this vulnerability by 2022-07-18. The required action was: Apply updates per vendor instructions. Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

What type of vulnerability is CVE-2018-4344?

CVE-2018-4344 is classified as Buffer Overflow (CWE-119). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

Which products and versions are affected by CVE-2018-4344?

CVE-2018-4344 affects apple iphone os; apple mac os x; apple tvos; apple watchos. Check the affected-products list on this page against your deployed version to confirm exposure.

When was CVE-2018-4344 published, and has it been updated?

CVE-2018-4344 was published on April 3, 2019 and was last updated on October 23, 2025. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CISA KEV·Added 2022-06-27 — agencies required to remediate by 2022-07-18

CVE-2018-4344

HIGH

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.

Published

Apr 3, 2019

Updated

Oct 23, 2025

Affected

0 pkgs

Patched

None yet

Exploits

1 known

EPSS Exploitation Probability

via FIRST.org ↗

0.2%probability of exploitation in next 30 days

Lower Risk39th percentile0.00%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Description

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.

Affected Products

4 products · 4 configurations

iphone osapple

< 12.0

range

mac os xapple

< 10.14

range

tvosapple

< 12.0

range

watchosapple

< 5.0

range

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

A memory corruption issue was addressed with improved memory handling. T…

cisa.govCISAJun 2022

Frequently Asked Questions

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.

O3 Security · Impact-Aware SCA

Is CVE-2018-4344 in your stack?

O3 detects CVE-2018-4344 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

Scan my stack How O3 SCA works

CVSS Score

7.8/10

CVSS v3 base score

Vector breakdown

AV:Attack Vector

Local

AC:Attack Complexity

Low

PR:Privileges Required

None

UI:User Interaction

Required

S:Scope

Unchanged

C:Confidentiality

High

I:Integrity

High

A:Availability

High

Raw vector

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

CWE Classification

CWE-119Buffer Overflow

Weaponization

No known public exploit tooling found.

Timeline

Disclosed

Apr 3, 2019

KEV added

Jun 27, 2022

First exploit

Jun 27, 2022

Last updated

Oct 23, 2025

Identifiers

CVE-2018-4344

References

Advisorysupport.apple.com Advisorysupport.apple.com Advisorysupport.apple.com Advisorysupport.apple.com Advisorysupport.apple.com Advisorysupport.apple.com Advisorysupport.apple.com Advisorysupport.apple.com Webcisa.gov

Data from OSV.dev, enriched by O3 Security. Refreshed hourly.