What is CVE-2018-4089?

CVE-2018-4089 is a high-severity vulnerability in Apple Tv, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 8.8/10. Published 2018-04-03.

How severe is CVE-2018-4089?

High severity. CVSS v3 base score is 8.8 out of 10.

Is CVE-2018-4089 known to be exploited?

6 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Apple Tv

CVE-2018-4089

An issue was discovered in certain Apple products. iOS before 11.2.5 is affected. macOS before 10.13.3 is affected. Safari before 11.0.3 is affected. tvOS before 11.2.5 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.

Vulnerability class: Buffer Overflow

Published 2018-04-03 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.064 (93.5th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 93rd percentile — 93.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.065 · newest: 0.064 · change: -0.001

Affected products

Weakness classification (CWE)

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

Public proof-of-concept exploits

References

support.apple.com/HT208462 (Vendor Advisory)
www.securitytracker.com/id/1040266 (VDB Entry, Third Party Advisory, vdb-entry)
support.apple.com/HT208465 (Vendor Advisory)
www.securitytracker.com/id/1040265 (VDB Entry, Third Party Advisory, vdb-entry)
www.exploit-db.com/exploits/43937/ (Exploit, VDB Entry, Third Party Advisory, exploit)
www.securityfocus.com/bid/102778 (VDB Entry, Third Party Advisory, vdb-entry)
www.securitytracker.com/id/1040267 (VDB Entry, Third Party Advisory, vdb-entry)
support.apple.com/HT208475 (Vendor Advisory)
support.apple.com/HT208463 (Vendor Advisory)

Frequently asked questions

What is CVE-2018-4089?: CVE-2018-4089 is a high-severity vulnerability in Apple Tv, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 8.8/10. Published 2018-04-03.
How severe is CVE-2018-4089?: High severity. CVSS v3 base score is 8.8 out of 10.
Is CVE-2018-4089 known to be exploited?: 6 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.