Is CVE-2015-8867 in the CISA KEV catalog?

No. CVE-2015-8867 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2015-8867?

CVE-2015-8867 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2015-8867?

CVE-2015-8867 has an EPSS score of 4.35% (90th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2015-8867?

Upgrade php to 5.6.12 or later.

CVE & CISA-KEV Catalog

CVE-2015-8867

HIGHEPSS 90th pctl

7.5

CVSS v3

NVD

Description

The openssl_random_pseudo_bytes function in ext/openssl/openssl.c in PHP before 5.4.44, 5.5.x before 5.5.28, and 5.6.x before 5.6.12 incorrectly relies on the deprecated RAND_pseudo_bytes function, which makes it easier for remote attackers to defeat cryptographic protection mechanisms via unspecified vectors.

CWE-310Cryptographic Issues

How to fix

Remediation Available

phpNVD

Affected:>= 5.6.0, < 5.6.12Fixed in:5.6.12CVE-2015-8867derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Exploit Intelligence

4.35%probability of exploitation in 30 days

90thpercentile

High risk: more likely to be exploited than 90% of all known CVEs.

References

Vendor Advisory3

Third-Party Advisory8

Other references1

git.php.net

Related Vulnerabilities

Other CWE-310 (Cryptographic Issues) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2014-3566	Low	3.4	100%	-	Fix
CVE-2015-4000	Low	3.7	100%	-	Fix
CVE-2015-0204	Medium	4.3	99%	-	Fix
CVE-2016-2107	Medium	5.9	89%	-	Fix
CVE-2016-0800	Medium	5.9	82%	-	Fix
CVE-2014-8684	Critical	9.8	72%	-	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-06.