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CVE-2018-4200· NVD / CVE Program· CNA apple

An issue was discovered in certain Apple products.

Noroxi assessment

Priority: Monitor (action score 38/100)

  • Public proof-of-concept code exists (Exploit-DB); there is no record of exploitation in the wild.
  • Probability of exploitation in the next 30 days: 8.5% (FIRST EPSS); higher than 94.9% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
  • Fixed version: webkit2gtk (Debian:12) 2.20.2-1; accountsservice (Red Hat:enterprise_linux:7::client) 0:0.6.50-2.el7; accountsservice-debuginfo (Red Hat:enterprise_linux:7::client) 0:0.6.50-2.el7.

Low priority for now. Upgrade to webkit2gtk (Debian:12) 2.20.2-1; accountsservice (Red Hat:enterprise_linux:7::client) 0:0.6.50-2.el7; accountsservice-debuginfo (Red Hat:enterprise_linux:7::client) 0:0.6.50-2.el7 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

An issue was discovered in certain Apple products. iOS before 11.3.1 is affected. Safari before 11.1 is affected. iCloud before 7.5 on Windows is affected. iTunes before 12.7.5 on Windows is affected. tvOS before 11.4 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 that triggers a WebCore::jsElementScrollHeightGetter use-after-free.

HighCVSS 8.8 · v3.0—Proof of concept Fix available
Published
Jun 8, 2018
Updated
Jun 16, 2026
EPSS
8.6% · 95th percentile

Report tools

JSON

Action score

38

Monitor

Low priority for now.

CVSS
35 / 40 · 8.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
3 / 30 · 8.6%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • Proof of concept exists, no weaponized module
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
applesafari
appleiphone os
appletvos
appleicloud
appleitunes
microsoftwindows
canonicalubuntu linux

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • apple icloudbefore 7.5
  • apple iphone osbefore 11.3.1
  • apple itunesbefore 12.7.5
  • apple safaribefore 11.1
  • apple tvosbefore 11.4
  • canonical ubuntu linux16.04
  • canonical ubuntu linux17.10
  • canonical ubuntu linux18.04

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12webkit2gtkbefore 2.20.2-12.20.2-1
Red Hat:enterprise_linux:7::clientaccountsservicebefore 0:0.6.50-2.el70:0.6.50-2.el7
Red Hat:enterprise_linux:7::clientaccountsservice-debuginfobefore 0:0.6.50-2.el70:0.6.50-2.el7
Red Hat:enterprise_linux:7::clientaccountsservice-develbefore 0:0.6.50-2.el70:0.6.50-2.el7
Red Hat:enterprise_linux:7::clientaccountsservice-libsbefore 0:0.6.50-2.el70:0.6.50-2.el7
Red Hat:enterprise_linux:7::clientadwaita-cursor-themebefore 0:3.28.0-1.el70:3.28.0-1.el7
Red Hat:enterprise_linux:7::clientadwaita-gtk2-themebefore 0:3.28-2.el70:3.28-2.el7
Red Hat:enterprise_linux:7::clientadwaita-icon-themebefore 0:3.28.0-1.el70:3.28.0-1.el7
Red Hat:enterprise_linux:7::clientadwaita-icon-theme-develbefore 0:3.28.0-1.el70:3.28.0-1.el7
Red Hat:enterprise_linux:7::clientappstream-databefore 0:7-20180614.el70:7-20180614.el7
Red Hat:enterprise_linux:7::clientat-spi2-atkbefore 0:2.26.2-1.el70:2.26.2-1.el7
Red Hat:enterprise_linux:7::clientat-spi2-atk-debuginfobefore 0:2.26.2-1.el70:2.26.2-1.el7
Red Hat:enterprise_linux:7::clientat-spi2-atk-develbefore 0:2.26.2-1.el70:2.26.2-1.el7
Red Hat:enterprise_linux:7::clientat-spi2-corebefore 0:2.28.0-1.el70:2.28.0-1.el7
Red Hat:enterprise_linux:7::clientat-spi2-core-debuginfobefore 0:2.28.0-1.el70:2.28.0-1.el7
Red Hat:enterprise_linux:7::clientat-spi2-core-develbefore 0:2.28.0-1.el70:2.28.0-1.el7
Red Hat:enterprise_linux:7::clientatkbefore 0:2.28.1-1.el70:2.28.1-1.el7
Red Hat:enterprise_linux:7::clientatk-debuginfobefore 0:2.28.1-1.el70:2.28.1-1.el7
Red Hat:enterprise_linux:7::clientatk-develbefore 0:2.28.1-1.el70:2.28.1-1.el7
Red Hat:enterprise_linux:7::clientbaobabbefore 0:3.28.0-2.el70:3.28.0-2.el7
Red Hat:enterprise_linux:7::clientbaobab-debuginfobefore 0:3.28.0-2.el70:3.28.0-2.el7
Red Hat:enterprise_linux:7::clientboltbefore 0:0.4-3.el70:0.4-3.el7
Red Hat:enterprise_linux:7::clientbolt-debuginfobefore 0:0.4-3.el70:0.4-3.el7
Red Hat:enterprise_linux:7::clientbraserobefore 0:3.12.2-5.el70:3.12.2-5.el7

+96

Same product

apple: all records

Other highest-scoring records for the same primary product.

  • CVE-2023-28205A use after free issue was addressed with improved memory management.KEV
    73This week
  • CVE-2023-32439A type confusion issue was addressed with improved checks.KEV
    72This week
  • CVE-2023-32435A memory corruption issue was addressed with improved state management.KEV
    72This week
  • CVE-2025-24201An out-of-bounds write issue was addressed with improved checks to prevent unauthorized actions.KEV
    71This week
  • CVE-2023-37450The issue was addressed with improved checks.KEV
    71This week
  • CVE-2022-22620A use after free issue was addressed with improved memory management.KEV
    70This week

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:webkit2gtk2.20.2-1 · Debian:12Package registry (OSV)
red hat:accountsservice0:0.6.50-2.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:accountsservice-debuginfo0:0.6.50-2.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:accountsservice-libs0:0.6.50-2.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:adwaita-cursor-theme0:3.28.0-1.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:adwaita-gtk2-theme0:3.28-2.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:PackageKit0:1.1.10-1.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:PackageKit-command-not-found0:1.1.10-1.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:PackageKit-debuginfo0:1.1.10-1.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:PackageKit-glib0:1.1.10-1.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:PackageKit-gstreamer-plugin0:1.1.10-1.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:PackageKit-gtk3-module0:1.1.10-1.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:PackageKit-yum0:1.1.10-1.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Exploit-DB entry ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Exploit-DB entrydos2018-05-02

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. First PoC-38 d
  2. Published
  3. TodayOct 14, 2026+3050 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • A user must open a link or visit a page.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-416 · Use After Free

CVSS vector

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

nvd-primary

Root cause

After a memory region is freed, another reference pointing to it is still used. By then, the same region may have been allocated for different data.

The bug in code

The whole CWE-416 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

c
free(dev->buf);/* ... another thread is still running ... */process(dev->buf);

Fixed

c
lock(&dev->lock);free(dev->buf);dev->buf = NULL;unlock(&dev->lock);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (8 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records