Is CVE-2017-13855 in the CISA KEV catalog?

No. CVE-2017-13855 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2017-13855?

CVE-2017-13855 has a CVSS v3 base score of 5.5 (MEDIUM).

What is the EPSS score for CVE-2017-13855?

CVE-2017-13855 has an EPSS score of 4.78% (91th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2017-13855?

Upgrade iphone os to 11.2 or later. Fixes are available for 4 affected products.

CVE & CISA-KEV Catalog

CVE-2017-13855

MEDIUMEPSS 91th pctl

5.5

CVSS v3

NVD

Description

An issue was discovered in certain Apple products. iOS before 11.2 is affected. macOS before 10.13.2 is affected. tvOS before 11.2 is affected. watchOS before 4.2 is affected. The issue involves the "Kernel" component. It allows attackers to bypass intended memory-read restrictions via a crafted app that triggers type confusion.

CWE-704

How to fix

Remediation Available

iphone osNVD

Affected:< 11.2Fixed in:11.2CVE-2017-13855derived from NVD

mac os xNVD

Affected:< 10.13.2Fixed in:10.13.2CVE-2017-13855derived from NVD

tvosNVD

Affected:< 11.2Fixed in:11.2CVE-2017-13855derived from NVD

watchosNVD

Affected:< 4.2Fixed in:4.2CVE-2017-13855derived 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

AvailabilityNone

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

Exploit Intelligence

4.78%probability of exploitation in 30 days

91stpercentile

High risk: more likely to be exploited than 91% of all known CVEs.

References

Vendor Advisory4

Third-Party Advisory5

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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 2026-05-13.