Is CVE-2016-4776 in the CISA KEV catalog?

No. CVE-2016-4776 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2016-4776?

CVE-2016-4776 has a CVSS v3 base score of 7.1 (HIGH).

What is the EPSS score for CVE-2016-4776?

CVE-2016-4776 has an EPSS score of 1.00% (58th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2016-4776?

Upgrade iphone os to 10.0 or later. Fixes are available for 4 affected products.

CVE & CISA-KEV Catalog

CVE-2016-4776

HIGH

7.1

CVSS v3

NVD

Description

The kernel in Apple iOS before 10, OS X before 10.12, tvOS before 10, and watchOS before 3 allows attackers to obtain sensitive memory-layout information or cause a denial of service (out-of-bounds read) via a crafted app, a different vulnerability than CVE-2016-4773 and CVE-2016-4774.

CWE-125Out-of-bounds Read

How to fix

Remediation Available

iphone osNVD

Affected:< 10.0Fixed in:10.0CVE-2016-4776derived from NVD

mac os xNVD

Affected:< 10.12.0Fixed in:10.12.0CVE-2016-4776derived from NVD

tvosNVD

Affected:< 10.0Fixed in:10.0CVE-2016-4776derived from NVD

watchosNVD

Affected:< 3.0Fixed in:3.0CVE-2016-4776derived 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 VectorLocal

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

1.00%probability of exploitation in 30 days

58thpercentile

Moderate risk: more likely to be exploited than 58% of all known CVEs.

References

Vendor Advisory8

Third-Party Advisory2

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 2026-05-06.