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Fencer Intel
high 8.8

CVE-2018-4121 in the critical feed json

An issue was discovered in certain Apple products.

published 2018-04-03 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-15907

cvss
8.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
13.1%
EPSS 13.1% chance of exploitation in 30 days, percentile 96%
public exploits
1
Exploit-DB

Summary

An issue was discovered in certain Apple products. iOS before 11.3 is affected. Safari before 11.1 is affected. iCloud before 7.4 on Windows is affected. iTunes before 12.7.4 on Windows is affected. tvOS before 11.3 is affected. watchOS before 4.3 is affected. The issue involves the "WebKit" component. It allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption and application crash) via a crafted web site.

Patch / fix

  • apple safari 11.1
  • apple icloud 7.4
  • apple itunes 12.7.4
  • apple iphone_os 11.3
  • apple tvos 11.3
  • apple watchos 4.3
  • webkit2gtk Debian 14, Debian 13, Debian 12 2.20.0-2

debian advisories DEBIAN-CVE-2018-4121

  • webkit2gtk Ubuntu 16.04 LTS 2.20.1-0ubuntu0.16.04.1

ubuntu advisories UBUNTU-CVE-2018-4121

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • atk RHEL 7 2.28.1-1.el7
  • eog RHEL 7 3.28.3-1.el7
  • gcr RHEL 7 3.28.0-1.el7
  • gdm RHEL 7 1:3.28.2-9.el7
  • gjs RHEL 7 1.52.3-1.el7
  • gom RHEL 7 0.3.3-1.el7
  • bolt RHEL 7 0.4-3.el7
  • gtk3 RHEL 7 3.22.30-3.el7

red hat advisories RHSA-2018:3140

  • webkit2gtk3 SLES for SAP 12 SP3, SLES 12 SP3, SLED 12 SP3 +2 more 2.20.3-2.23.8

suse advisories SUSE-SU-2018:3387-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2018-4121 updated cvss 5.0

webkitgtk: memory corruption processing maliciously crafted web content

  • Red Hat Enterprise Linux 6 webkitgtk Red Hat Enterprise Linux 7 webkitgtk3, libwebkit2gtk
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux Client (v. 7) bolt 0.4-3.el7, gom 0.3.3-1.el7, atk 2.28.1-1.el7, eog 3.28.3-1.el7, gcr 3.28.0-1.el7, gdm 3.28.2-9.el7, +225 more Red Hat Enterprise Linux Client Optional (v. 7) eog 3.28.3-1.el7, vala 0.40.8-1.el7, gedit 3.28.1-1.el7, glade 3.22.1-1.el7, devhelp 3.28.1-1.el7, valadoc 0.40.8-1.el7, +73 more Red Hat Enterprise Linux ComputeNode (v. 7) atk 2.28.1-1.el7, gcr 3.28.0-1.el7, rest 0.8.1-2.el7, fwupd 1.0.8-4.el7, fwupdate 12-5.el7, gssdp 1.0.2-1.el7, +64 more Red Hat Enterprise Linux ComputeNode Optional (v. 7) bolt 0.4-3.el7, gdm 3.28.2-9.el7, gjs 1.52.3-1.el7, grilo 0.3.6-1.el7, gvfs 1.36.2-1.el7, vala 0.40.8-1.el7, +93 more Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) bolt 0.4-3.el7, gom 0.3.3-1.el7, atk 2.28.1-1.el7, eog 3.28.3-1.el7, gcr 3.28.0-1.el7, gdm 3.28.2-9.el7, +213 more Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) eog 3.28.3-1.el7, ekiga 4.0.1-8.el7, vala 0.40.8-1.el7, gedit 3.28.1-1.el7, glade 3.22.1-1.el7, devhelp 3.28.1-1.el7, +87 more
    +4 more products
    Red Hat Enterprise Linux Server (v. 7) bolt 0.4-3.el7, gom 0.3.3-1.el7, atk 2.28.1-1.el7, eog 3.28.3-1.el7, gcr 3.28.0-1.el7, gdm 3.28.2-9.el7, +214 more Red Hat Enterprise Linux Server Optional (v. 7) eog 3.28.3-1.el7, ekiga 4.0.1-8.el7, vala 0.40.8-1.el7, gedit 3.28.1-1.el7, glade 3.22.1-1.el7, devhelp 3.28.1-1.el7, +86 more Red Hat Enterprise Linux Workstation (v. 7) bolt 0.4-3.el7, gom 0.3.3-1.el7, atk 2.28.1-1.el7, eog 3.28.3-1.el7, gcr 3.28.0-1.el7, gdm 3.28.2-9.el7, +226 more Red Hat Enterprise Linux Workstation Optional (v. 7) eog 3.28.3-1.el7, vala 0.40.8-1.el7, gedit 3.28.1-1.el7, glade 3.22.1-1.el7, devhelp 3.28.1-1.el7, valadoc 0.40.8-1.el7, +72 more
    fixed: vendor fix RHSA-2018:3140
  • Red Hat Enterprise Linux 8 webkitgtk4
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Timeline

  1. Published
  2. First public exploit (EDB-44427)

Exploit prediction

13.10% chance of exploitation in the next 30 days, higher than 96% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • EDB-44427 WebKit - WebAssembly Parsing Does not Correctly Check Section Order dos, 2018-04-09
  • github.com https://github.com/mwrlabs/CVE-2018-4121 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.0 8.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Classification

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

References

Sources

Fencer Intel 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.