How severe is CVE-2023-28204?

CVE-2023-28204 has a CVSS score of 6.5/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by CVE-2023-28204?

Affected package information for CVE-2023-28204 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2023-28204?

No fixed version has been published for CVE-2023-28204 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is CVE-2023-28204 actively exploited in the wild?

Yes. There are 3 known exploit references for CVE-2023-28204, including 3 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2023-28204?

CVE-2023-28204 has an EPSS (Exploit Prediction Scoring System) score of 0.1%, placing it in the 23th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

Is CVE-2023-28204 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2023-28204 (Apple Multiple Products WebKit Out-of-Bounds Read Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2023-05-22. CISA required all US federal civilian agencies to remediate this vulnerability by 2023-06-12. The required action was: Apply updates per vendor instructions. Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

When was CVE-2023-28204 published, and has it been updated?

CVE-2023-28204 was published on June 23, 2023 and was last updated on April 16, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CISA KEV·Added 2023-05-22 — agencies required to remediate by 2023-06-12

CVE-2023-28204

MEDIUM

Published

Jun 23, 2023

Updated

Apr 16, 2026

Affected

0 pkgs

Patched

None yet

Exploits

3 known

EPSS Exploitation Probability

via FIRST.org ↗

0.1%probability of exploitation in next 30 days

Lower Risk23th percentile0.00%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Description

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.

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

An out-of-bounds read was addressed with improved input validation. This…

support.apple.comGoogle-sheetMay 2023

An out-of-bounds read was addressed with improved input validation. This…

cisa.govCISAMay 2023

An out-of-bounds read was addressed with improved input validation. This…

nvd.nist.govNVDJun 2023

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2023-28204 in your stack?

O3 detects CVE-2023-28204 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

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