← Vulnerability feed

Vulnerability record · CVE-2018-4240 · published 8 June 2018

CVE-2018-4240: Apple iphone os improper input validation vulnerability

Apple · Iphone Os

An issue was discovered in certain Apple products. iOS before 11.4 is affected. macOS before 10.13.5 is affected. tvOS before 11.4 is affected. watchOS before 4.3.1 is affected. The issue involves the "Messages" component. It allows remote attackers to cause a denial of service via a crafted message.

6.5 CVSS 3.0 Medium EPSS 6.9% · top 6.1% CWE-20 · Improper input validation
6.5CVSS 3.0 base score, v2 4.3
6.9%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
12References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

An issue was discovered in certain Apple products. iOS before 11.4 is affected. macOS before 10.13.5 is affected. tvOS before 11.4 is affected. watchOS before 4.3.1 is affected. The issue involves the "Messages" component. It allows remote attackers to cause a denial of service via a crafted message.

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Affected products

4 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.securitytracker.com/id/1041027 Third Party AdvisoryVDB Entry
https://support.apple.com/HT208848 Vendor Advisory
https://support.apple.com/HT208849 Vendor Advisory
https://support.apple.com/HT208850 Vendor Advisory
https://support.apple.com/HT208851 Vendor Advisory
https://www.exploit-db.com/exploits/45391/ ExploitThird Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1041027 Third Party AdvisoryVDB Entry
https://support.apple.com/HT208848 Vendor Advisory
https://support.apple.com/HT208849 Vendor Advisory
https://support.apple.com/HT208850 Vendor Advisory
https://support.apple.com/HT208851 Vendor Advisory
https://www.exploit-db.com/exploits/45391/ ExploitThird Party AdvisoryVDB Entry

Track CVE-2018-4240 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2025-43300Apple iOS, iPadOS and macOS out-of-bounds write via malicious imageAn out-of-bounds write in Apple iOS, iPadOS and macOS is triggered when processing a malicious image file, causing memory corruption. Apple states th…KEVEPSS 22%analysed10.0CVE-2025-24201Apple WebKit out-of-bounds write allows sandbox escapeCVE-2025-24201 is an out-of-bounds write in Apple's WebKit that was addressed with improved checks. Maliciously crafted web content may break out of …KEVEPSS 3.8%analysed10.0CVE-2025-24085Apple iOS, iPadOS, macOS, tvOS, visionOS, watchOS Use-After-Free Privilege EscalationA use-after-free flaw in Apple's operating systems was fixed through improved memory management in iOS 18.3, iPadOS 18.3 and 17.7.6, macOS Sequoia 15…KEVEPSS 18%analysed9.8CVE-2025-31200Apple OS media parsing memory corruption allows code executionA memory corruption flaw in Apple's audio stream processing was fixed with improved bounds checking across iOS, iPadOS, macOS, tvOS, visionOS and wat…KEVEPSS 19%analysed9.8CVE-2025-31201Apple OS Pointer Authentication bypass via arbitrary read/writeApple removed vulnerable code that allowed an attacker holding arbitrary read and write capability to bypass Pointer Authentication across iOS, iPadO…KEVEPSS 14%analysed9.8CVE-2022-22587Apple iOS, iPadOS and macOS kernel memory corruption via out-of-bounds writeAn out-of-bounds write (CWE-787) in Apple iOS, iPadOS and macOS is caused by insufficient input validation and can corrupt memory. Apple states it is…KEVEPSS 12%analysed9.8CVE-2021-1870Apple WebKit logic flaw allows remote code executionA logic issue in Apple's WebKit was addressed with improved restrictions, affecting macOS Big Sur, Catalina, Mojave, iOS and iPadOS, plus WebKitGTK a…KEVEPSS 7.7%analysed9.8CVE-2021-1871Apple WebKit logic flaw allows remote code executionA logic issue in Apple's WebKit was addressed with improved restrictions. It affects macOS Big Sur, Catalina, Mojave, iOS and iPadOS, and a remote at…KEVEPSS 7.0%analysed

Source: NIST National Vulnerability Database (record CVE-2018-4240), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.