CVE-2019-8642 — An issue existed in the handling of S-MIME certificates

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LOW

An issue existed in the handling of S-MIME certificates

Published Oct 27, 2020

3.3

LOW

CVSS 3.1

EPSS 0.32%

Description

An issue existed in the handling of S-MIME certificates. This issue was addressed with improved validation of S-MIME certificates. This issue is fixed in macOS Mojave 10.14.4, Security Update 2019-002 High Sierra, Security Update 2019-002 Sierra. Processing a maliciously crafted mail message may lead to S/MIME signature spoofing.

Affected products

Vendor Apple Product macOS Default
n/a
- Version
  unspecified
  Status
  affected
  Constraints
  <10.14

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Apple

macOS

n/a

Version	Status	Constraints
unspecified	affected	<10.14

Remediation

No remediation recorded yet.

Metrics

0.32% 0.00317

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.

EPSS probability 0.00317

Score over time

2021–2026

EPSS v1
EPSS v5
EPSS v2
EPSS v3

Percentile over time

EPSS v1
EPSS v5
EPSS v2
EPSS v3

Table of values (10 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 3, 2026	0.32% (0.00317)	22.38th	v5 (v2026.06.15)
Sep 20, 2026	0.32% (0.00317)	24.81th	v5 (v2026.06.15)
Jul 20, 2024	0.06% (0.00055)	23.27th	v3 (v2023.03.01)
Jun 11, 2024	0.06% (0.00055)	22.60th	v3 (v2023.03.01)
Sep 3, 2023	0.06% (0.00055)	20.58th	v3 (v2023.03.01)
Mar 7, 2023	0.05% (0.00050)	17.61th	v3 (v2023.03.01)
Mar 6, 2023	0.89% (0.00885)	27.89th	v2 (v2022.01.01)
Feb 4, 2022	0.89% (0.00885)	10.50th	v2 (v2022.01.01)
Feb 3, 2022	0.06% (0.00061)	0.14th	v5 (v2026.06.15)
Apr 14, 2021	0.06% (0.00061)	0.00th	v1