What is CVE-2023-28204?

CVE-2023-28204 is a medium-severity vulnerability in Apple iOS And Ipados, classified under Out-of-bounds Read. CVSS score: 6.5/10. Published 2023-06-23.

How severe is CVE-2023-28204?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Is CVE-2023-28204 known to be exploited?

Yes. CVE-2023-28204 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2023-05-22), indicating it is being actively exploited. 3 public proof-of-concept repositories are indexed.

Out-of-bounds Read in Apple iOS And Ipados

CVE-2023-28204

An out-of-bounds read was addressed with improved input validation. This issue is fixed in watchOS 9.5, tvOS 16.5, macOS Ventura 13.4, iOS 15.7.6 and iPadOS 15.7.6, Safari 16.5, iOS 16.5 and iPadOS 16.5. Processing web content may disclose sensitive information. Apple is aware of a report that this issue may have been actively exploited.

Vulnerability class: Buffer Overflow

Published 2023-06-23 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.143 (96.6th percentile), scored 2026-10-18.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 97th percentile — 96.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.143 · newest: 0.143 · change: 0.000

Affected products

Apple iOS And Ipados — versions unspecified
Apple Ipados
Apple Iphone OS
Apple macOS — versions unspecified
Apple Safari — versions unspecified
Apple tvOS — versions unspecified
Apple watchOS — versions unspecified
Webkitgtk Webkitgtk\+

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2023-05-22. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2023-06-12.

Required action: Apply updates per vendor instructions.

Public proof-of-concept exploits

References

support.apple.com/en-us/HT213758 (Release Notes, Vendor Advisory)
support.apple.com/en-us/HT213762 (Release Notes, Vendor Advisory)
support.apple.com/en-us/HT213764 (Release Notes, Vendor Advisory)
support.apple.com/en-us/HT213765 (Release Notes, Vendor Advisory)
support.apple.com/en-us/HT213757 (Release Notes, Vendor Advisory)
support.apple.com/en-us/HT213761 (Release Notes, Vendor Advisory)
security.gentoo.org/glsa/202401-04 (Third Party Advisory)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)

Frequently asked questions

What is CVE-2023-28204?: CVE-2023-28204 is a medium-severity vulnerability in Apple iOS And Ipados, classified under Out-of-bounds Read. CVSS score: 6.5/10. Published 2023-06-23.
How severe is CVE-2023-28204?: Medium severity. CVSS v3 base score is 6.5 out of 10.
Is CVE-2023-28204 known to be exploited?: Yes. CVE-2023-28204 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2023-05-22), indicating it is being actively exploited. 3 public proof-of-concept repositories are indexed.