How severe is CVE-2015-5894?

CVE-2015-5894 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2015-5894 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2015-5894?

CVE-2015-5894 affects Apple Mac Os X. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2015-5894?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2015-5894 published?

CVE-2015-5894 was published on 2015-10-09 and last updated on 2026-06-17.

CVE-2015-5894

CVE-2015-5894 is a medium-severity vulnerability in Apple Mac Os X with a CVSS 2.0 base score of 4.3. 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-17.

Key facts

Severity: Medium (CVSS 2.0 base score 4.3)
EPSS exploit prediction: 1% (52nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-17
Affected product: Apple Mac Os X
Published: 2015-10-09
Last modified: 2026-06-17

Description

The X.509 certificate-trust implementation in Apple OS X before 10.11 does not recognize that the kSecRevocationRequirePositiveResponse flag implies a revocation-checking requirement, which makes it easier for man-in-the-middle attackers to spoof endpoints by leveraging access to a revoked certificate.

Frequently asked questions

What is CVE-2015-5894?: The X.509 certificate-trust implementation in Apple OS X before 10.11 does not recognize that the kSecRevocationRequirePositiveResponse flag implies a revocation-checking requirement, which makes it easier for man-in-the-middle attackers to spoof endpoints by leveraging access to a revoked certificate.
How severe is CVE-2015-5894?: CVE-2015-5894 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2015-5894 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2015-5894?: CVE-2015-5894 affects Apple Mac Os X. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2015-5894?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2015-5894 published?: CVE-2015-5894 was published on 2015-10-09 and last updated on 2026-06-17.

References

Affected products (1)

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

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