CVE-2018-4121
It allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption and application crash) via a crafted web site.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 13.1%, higher than 96% of all known CVEs. Patch or mitigate before the next change window.
Description
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 3.0
- 8.8 HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- EPSS
- 13.10% probability · 96th percentile
- Public exploits
- 1 in Exploit-DB · verified · first 9 April 2018
- CISA KEV
- Not listed
- Weakness
- CWE-119
- Affected
- apple/safari · apple/iphone os · apple/tvos · apple/watchos · apple/icloud · apple/itunes
- Source
- product-security@apple.com
EPSS moved from 11.5% on 21 September 2026 to 13.1% on 27 October 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.
Public exploits (1)
Entries in Exploit-DB that cite this CVE. Links go to the Exploit-DB page and to the file in the public repository; nothing is hosted here. A verified tick means the Exploit-DB team confirmed the exploit works against the stated version.
References
- http://www.securitytracker.com/id/1040604Third Party Advisory, VDB Entry
- https://github.com/mwrlabs/CVE-2018-4121Exploit, Third Party Advisory
- https://security.gentoo.org/glsa/201808-04Third Party Advisory
- https://support.apple.com/HT208693Vendor Advisory
- https://support.apple.com/HT208694Vendor Advisory
- https://support.apple.com/HT208695Vendor Advisory
- https://support.apple.com/HT208696Vendor Advisory
- https://support.apple.com/HT208697Vendor Advisory
- https://support.apple.com/HT208698Vendor Advisory
- https://www.exploit-db.com/exploits/44427/Exploit, Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1040604Third Party Advisory, VDB Entry
- https://github.com/mwrlabs/CVE-2018-4121Exploit, Third Party Advisory
- https://security.gentoo.org/glsa/201808-04Third Party Advisory
- https://support.apple.com/HT208693Vendor Advisory
- https://support.apple.com/HT208694Vendor Advisory
- https://support.apple.com/HT208695Vendor Advisory
- https://support.apple.com/HT208696Vendor Advisory
- https://support.apple.com/HT208697Vendor Advisory
- https://support.apple.com/HT208698Vendor Advisory
- https://www.exploit-db.com/exploits/44427/Exploit, Third Party Advisory, VDB Entry
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.