Is CVE-2017-13871 in the CISA KEV catalog?

No. CVE-2017-13871 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2017-13871?

CVE-2017-13871 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2017-13871?

CVE-2017-13871 has an EPSS score of 1.48% (71th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2017-13871?

Upgrade mac os x to 10.13.2 or later.

CVE & CISA-KEV Catalog

CVE-2017-13871

HIGHEPSS 71th pctl

7.5

CVSS v3

NVD

Description

An issue was discovered in certain Apple products. macOS before 10.13.2 is affected. The issue involves the "Mail" component. It allows remote attackers to read cleartext e-mail content (for which S/MIME encryption was intended) by leveraging the lack of installation of an S/MIME certificate by the recipient.

How to fix

Remediation Available

mac os xNVD

Affected:< 10.13.2Fixed in:10.13.2CVE-2017-13871derived 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

1.48%probability of exploitation in 30 days

71stpercentile

Elevated risk: more likely to be exploited than 71% of all known CVEs.

References

Vendor Advisory1

support.apple.com

Third-Party Advisory2

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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.