Threats / Apple / CVE-2023-42917
CVE-2023-42917
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-06-22
Apple Multiple Products vulnerability
Apple WebKit memory corruption vulnerability in iOS, iPadOS, macOS, and Safari enables remote code execution through maliciously crafted web content. Affects multiple Apple products and third-party applications using WebKit.
Verdict
Today item — known-exploited.
Out-of-bounds write vulnerability in WebKit HTML processing allows unauthenticated remote attackers to execute arbitrary code by delivering malicious web content to vulnerable browsers and applications. Active exploitation observed in the wild.
01
Is it exploitable?
— the evidence, ranked above the scoreReported exploitation
6 independent public reports of in-the-wild exploitation are cataloged.Distinct reporting sources (vendor, incident response, government); open them for the underlying claims.
Exploited in the wild
Listed in the CISA Known Exploited Vulnerabilities catalog (added 2023-12-04).
Probability (EPSS)
EPSS 0.0937 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
Affected: Apple, Multiple Products. Confirm exact fixed builds in the vendor advisory.
Weakness (CWE)
Mapped to CWE-787 Out-of-bounds Write — weakness family: Memory safety.CWE assignment from the public NVD record; the weakness class drives how the flaw is exploited.
02
Who’s exploiting it?
— attribution turns risk into urgencyAttribution not established
No confirmed (advisory-backed) threat-actor attribution is established for this record. Absence of a named actor is not absence of compromise — see Coverage & confidence.
03
Why it matters
— the attack path, told twice: adversary, then board1
Front door — unauthenticated access narrative 1
Attacker
Craft malicious HTML or web content designed to trigger out-of-bounds memory write in WebKit parser
Business
User device compromised through routine web browsing without additional user interaction required
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
Deliver payload via compromised website, ad network, or direct link to target victim's browser or WebKit-dependent application
Business
Attack scales across Safari users and any third-party applications relying on WebKit for content rendering
3
Lateral reach — past segmentation narrative 3
Attacker
Exploit memory corruption to achieve arbitrary code execution with browser or application privileges
Business
Attacker gains ability to steal credentials, install malware, exfiltrate data, or establish persistent access
04
What to do
— defensible action- Remediate per the vendor advisory — confirm the fixed build for your version and verify exposure.1
Say it to the boardA vulnerability with this evidence profile is a defensible budget line, not a backlog ticket — fund the change against the proof above.
05