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Fencer Vulns
high 7.8

CVE-2018-4241 json

An issue was discovered in certain Apple products.

published 2018-06-08 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-16027

cvss
7.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
8.0%
EPSS 8.0% chance of exploitation in 30 days, percentile 94%
public exploits
1
Exploit-DB

Summary

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.

Patch / fix

  • apple apple_tv 11.4
  • apple iphone_os 11.4
  • apple mac_os_x 10.13.5
  • apple watchos 4.3.1

Timeline

  1. First public exploit (EDB-44849)
  2. Published

Exploit prediction

7.96% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-44849 XNU Kernel - Heap Overflow Due to Bad Bounds Checking in MPTCP dos, 2018-06-06
  • bugs.chromium.org https://bugs.chromium.org/p/project-zero/issues/detail?id=1558 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.0 7.8 CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 9.3 AV:N/AC:M/Au:N/C:C/I:C/A:C

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.