Is CVE-2018-4203 in the CISA KEV catalog?

No. CVE-2018-4203 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2018-4203?

CVE-2018-4203 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2018-4203?

CVE-2018-4203 has an EPSS score of 1.54% (72th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2018-4203?

Upgrade iphone os to 12.0 or later. Fixes are available for 4 affected products.

CVE & CISA-KEV Catalog

CVE-2018-4203

HIGHEPSS 72th pctl

7.5

CVSS v3

NVD

Description

An out-of-bounds read was addressed with improved bounds checking. This issue affected versions prior to iOS 12, macOS Mojave 10.14, tvOS 12, watchOS 5.

CWE-125Out-of-bounds Read

How to fix

Remediation Available

iphone osNVD

Affected:< 12.0Fixed in:12.0CVE-2018-4203derived from NVD

mac os xNVD

Affected:< 10.14Fixed in:10.14CVE-2018-4203derived from NVD

tvosNVD

Affected:< 12Fixed in:12CVE-2018-4203derived from NVD

watchosNVD

Affected:< 5.0Fixed in:5.0CVE-2018-4203derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Exploit Intelligence

1.54%probability of exploitation in 30 days

72ndpercentile

Elevated risk: more likely to be exploited than 72% of all known CVEs.

References

Vendor Advisory5

Related Vulnerabilities

Other CWE-125 (Out-of-bounds Read) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2014-0160	High	7.5	100%	KEV	Fix
CVE-2025-5777	High	7.5	100%	KEV + Ransom	Fix
CVE-2021-4034	High	7.8	95%	KEV	Fix
CVE-2023-21769	High	7.5	92%	-	Fix
CVE-2023-49285	High	8.6	89%	-	Fix
CVE-2020-8794	Critical	9.8	89%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.