How severe is CVE-2018-4276?

CVE-2018-4276 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2018-4276 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-4276?

CVE-2018-4276 affects Apple Mac Os X. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-4276?

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

When was CVE-2018-4276 published?

CVE-2018-4276 was published on 2019-04-03 and last updated on 2026-06-17.

CVE-2018-4276

CVE-2018-4276 is a high-severity vulnerability in Apple Mac Os X with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-476.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (65th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-476
Affected product: Apple Mac Os X
Published: 2019-04-03
Last modified: 2026-06-17

Description

A null pointer dereference was addressed with improved validation. This issue affected versions prior to macOS High Sierra 10.13.6.

Frequently asked questions

What is CVE-2018-4276?: A null pointer dereference was addressed with improved validation. This issue affected versions prior to macOS High Sierra 10.13.6.
How severe is CVE-2018-4276?: CVE-2018-4276 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2018-4276 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-4276?: CVE-2018-4276 affects Apple Mac Os X. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-4276?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2018-4276 published?: CVE-2018-4276 was published on 2019-04-03 and last updated on 2026-06-17.

References

https://support.apple.com/kb/HT208937

Affected products (1)

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

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