CVE-2018-4121

mediumpriority · attend · 50EPSS 0.131 · 96 %ileexploit · functionalEUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

4 exploits · functional

Likely / severe?

13.1% (96th) EPSS

CVSS 6.8 · medium

Is it mine?

7 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · nvd

EPSS · scored 2026-10-27

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.

cvss

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

8.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.8–8.8

v2.06.8mediumAV:N/AC:M/Au:N/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 8.6 · impact 6.4

v3.08.8highCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 2.8 · impact 5.9

v3.08.3highCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:Psecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-119USprimary

exploits (4)

Public proof-of-concept and weaponised exploit code.

EDB-44427WebKit - WebAssembly Parsing Does not Correctly Check Section Orderfunctional · exploit_db
FSecureLABS/CVE-2018-4121macOS 10.13.3 (17D47) Safari Wasm Exploit PoC · poc_in_github
jezzus/CVE-2018-4121jezzus/CVE-2018-4121PoC · poc_in_github
likekabin/CVE-2018-4121likekabin/CVE-2018-4121PoC · poc_in_github

affected products (7)

Products and version ranges known to be affected.

n/a n/a≤ n/aenisa_euvdEU
apple icloud< 7.4nvdUScpe:2.3:a:apple:icloud:*:*:*:*:*:*:*:*
apple iphone os< 11.3nvdUScpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*
apple itunes< 12.7.4nvdUScpe:2.3:a:apple:itunes:*:*:*:*:*:*:*:*
apple safari< 11.1nvdUScpe:2.3:a:apple:safari:*:*:*:*:*:*:*:*
apple tvos< 11.3nvdUScpe:2.3:o:apple:tvos:*:*:*:*:*:*:*:*
apple watchos< 4.3nvdUScpe:2.3:o:apple:watchos:*:*:*:*:*:*:*:*

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd NVD CVE.org MITRE

published 2018-04-03modified 2026-06-17

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+21038 more

references (31)

External citations — patches, advisories, analysis.

scry

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