How severe is CVE-2018-4091?

CVE-2018-4091 has a CVSS 3.x base score of 10.0, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2018-4091 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-4091?

CVE-2018-4091 affects Apple Mac Os X. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-4091?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2018-4091 published?

CVE-2018-4091 was published on 2018-04-03 and last updated on 2026-06-17.

CVE-2018-4091

CVE-2018-4091 is a critical-severity vulnerability in Apple Mac Os X with a CVSS 3.x base score of 10.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Critical (CVSS 3.x base score 10.0)
CVSS v2: 7.5
EPSS exploit prediction: 2% (76th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Apple Mac Os X
Published: 2018-04-03
Last modified: 2026-06-17

Description

An issue was discovered in certain Apple products. macOS before 10.13.3 is affected. The issue involves the "Sandbox" component. It allows bypass of a sandbox protection mechanism.

Frequently asked questions

What is CVE-2018-4091?: An issue was discovered in certain Apple products. macOS before 10.13.3 is affected. The issue involves the "Sandbox" component. It allows bypass of a sandbox protection mechanism.
How severe is CVE-2018-4091?: CVE-2018-4091 has a CVSS 3.x base score of 10.0, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2018-4091 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-4091?: CVE-2018-4091 affects Apple Mac Os X. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-4091?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2018-4091 published?: CVE-2018-4091 was published on 2018-04-03 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:apple:mac_os_x:*:*:*:*:*:*:*:*

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