CVE-2018-4241

highpriority · track · 44EPSS 0.080 · 95 %ileexploit · functionalEURUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

2 exploits · functional

Likely / severe?

7.96% (95th) EPSS

CVSS 9.3 · high

Is it mine?

9 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · fstec_bdu · nvd

EPSS · scored 2026-10-27

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 "Kernel" component. A buffer overflow in mptcp_usr_connectx allows attackers to execute arbitrary code in a privileged context via a crafted app.

cvss

Technical severity, 0–10. One row per scoring source.

9.3

010

base score 0–10 · higher = more severe · hover a vector to decode

v2.09.3highAV:N/AC:M/Au:N/C:C/I:C/A:Cprimary · NVD / NIST USexploitability 8.6 · impact 10

v3.07.8highCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 1.8 · impact 5.9

v3.07.4highCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:Psecondary · CVSS-BT (t0sche)

v3.17.8highAV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-119USprimaryCWE-119US

exploits (2)

Public proof-of-concept and weaponised exploit code.

EDB-44849XNU Kernel - Heap Overflow Due to Bad Bounds Checking in MPTCPfunctional · exploit_db
0neday/multi_pathCVE-2018-4241: XNU kernel heap overflow due to bad bounds checking in MPTCP for iOS 11 - 11.3.1released by Ian BeerPoC · poc_in_github

affected products (9)

Products and version ranges known to be affected.

n/a n/a≤ n/aenisa_euvdEU
Apple Inc. MacOS≤ 10.13.5fstec_bduRU
Apple Inc. iOS≤ 11.4fstec_bduRU
Apple Inc. tvOS≤ 11.4fstec_bduRU
Apple Inc. watchOS≤ 4.3.1fstec_bduRU
apple apple tv< 11.4nvdUScpe:2.3:a:apple:apple_tv:*:*:*:*:*:*:*:*
apple iphone os< 11.4nvdUScpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*
apple mac os x< 10.13.5nvdUScpe:2.3:o:apple:mac_os_x:*:*:*:*:*:*:*:*
apple watchos< 4.3.1nvdUScpe:2.3:o:apple:watchos:*:*:*:*:*:*:*:*

also known as (6)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu nvd NVD CVE.org MITRE

published 2018-06-08modified 2026-06-17

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+21023 more

references (22)

External citations — patches, advisories, analysis.

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