medium Known exploitedREV. 01
CVE-2023-28204Apple WebKit — a read past the buffer discloses data
Processing web content reads outside a buffer in WebKit and hands back whatever was there. Apple closed it with stricter input validation and reports active exploitation across every platform shipping the engine.
Read the risk
THE VITAL STATS- CVSS score
- 6.5/ 10 CVSS v3.1
- EPSS probability
- 14% Likelihood of exploitation
- Attack complexity
- Low Conditions needed to exploit
- Known exploited
- Yes — CISA KEV
- CVE published
- 2023-06-23
- Added to KEV
- 2023-05-22
- Exploit published
- Not recorded
- Confidence
- high
- Kill chain
- collection
- MITRE ATT&CK
- —
- Severity
- medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Attacker needsThe user must open attacker-controlled web content.
Fixed iniOS 16.5, iOS 15.7.6, macOS Ventura 13.4, Safari 16.5, tvOS 16.5, watchOS 9.5
Behind the card
5 REFERENCES- 01CVE recordNVD recordnvd.nist.gov
- 02CISACISA Known Exploited Vulnerabilities catalogcisa.gov
- 03Vendor advisorysupport.apple.comsupport.apple.com
- 04Vendor advisorysupport.apple.comsupport.apple.com
- 05Vendor advisorysupport.apple.comsupport.apple.com
Field-level provenanceTRACE THE SOURCES +
Which source supports each field, when it was retrieved, and who extracted it.
| Fields | Source | Retrieved | Extractor | Confidence |
|---|---|---|---|---|
| cvss, exploitation.attack_complexity, exploitation.exploit_available, references, published_at | nvd.nist.gov | 2026-09-24 | scrty-crds-pipeline/0.1 | high |
| exploitation.known_exploited, exploitation.kev_added | cisa.gov | 2026-09-24 | scrty-crds-pipeline/0.1 | high |
| epss | api.first.org | 2026-09-24 | scrty-crds-pipeline/0.1 | high |
| title, summary, severity, remediation, mitre_attack, kill_chain, recommended_action, confidence, tags, exploitation.prerequisites | nvd.nist.gov | 2026-09-24 | claude-code | high |
Printing history
THE RECORD- r1Initial base card
First printing. This card has not been reprinted since publication.