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

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MEDIUM

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

Published Oct 9, 2015

4.3

MEDIUM

CVSS 2.0

EPSS 0.80%

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.

Affected products

Remediation

No remediation recorded yet.

Metrics

0.80% 0.00800

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.

EPSS probability 0.00800

Score over time

2022–2026

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Percentile over time

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Table of values (10 key points)

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

Date	Score	Percentile	Model
Oct 2, 2026	0.80% (0.00800)	55.01th	v5 (v2026.06.15)
Jun 15, 2026	0.80% (0.00800)	51.60th	v5 (v2026.06.15)
Mar 17, 2025	0.21% (0.00213)	41.84th	v4 (v2025.03.14)
Dec 12, 2024	0.10% (0.00100)	42.94th	v3 (v2023.03.01)
Jul 10, 2024	0.10% (0.00100)	41.67th	v3 (v2023.03.01)
Mar 7, 2023	0.10% (0.00100)	39.66th	v3 (v2023.03.01)
Mar 6, 2023	1.02% (0.01018)	40.69th	v2 (v2022.01.01)
Sep 10, 2022	1.02% (0.01018)	38.88th	v2 (v2022.01.01)
Apr 1, 2022	1.02% (0.01018)	36.86th	v2 (v2022.01.01)
Feb 4, 2022	1.02% (0.01018)	19.50th	v2 (v2022.01.01)

Weaknesses (1)

CWE-17

References (4)

http://lists.apple.com/archives/security-announce/2015/Sep/msg00008.html
vendor-advisoryx_refsource_APPLEVendor Advisory
http://www.securityfocus.com/bid/76908
vdb-entryx_refsource_BID
http://www.securitytracker.com/id/1033703
vdb-entryx_refsource_SECTRACK
https://support.apple.com/HT205267
x_refsource_CONFIRMVendor Advisory

Link	Providers	Tags
http://lists.apple.com/archives/security-announce/2015/Sep/msg00008.html		vendor-advisoryx_refsource_APPLEVendor Advisory
http://www.securityfocus.com/bid/76908		vdb-entryx_refsource_BID
http://www.securitytracker.com/id/1033703		vdb-entryx_refsource_SECTRACK
https://support.apple.com/HT205267		x_refsource_CONFIRMVendor Advisory

Change history (0)

No recorded changes yet.

Sources

CVE.org / MITRE

Status PUBLISHED

Assigner apple

Published Oct 9, 2015

Updated Aug 6, 2024

Reserved Aug 6, 2015

Link CVE-2015-5894

CISA Vulnrichment

Updated n/a

NVD

Status Modified

Modified Jun 17, 2026

Link CVE-2015-5894

Red Hat

Severity n/a

Public date n/a

Links CVE-2015-5894