How severe is CVE-2015-0231?

CVE-2015-0231 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-2015-0231 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 43% (99th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2015-0231?

CVE-2015-0231 primarily affects Php. In total, 84 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2015-0231?

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-2015-0231 published?

CVE-2015-0231 was published on 2015-01-27 and last updated on 2026-06-17.

CVE-2015-0231

CVE-2015-0231 is a high-severity vulnerability in Php with a CVSS 2.0 base score of 7.5. Its EPSS exploit-prediction score of 43% places it in the 99th percentile, indicating an elevated likelihood of exploitation.

Key facts

Severity: High (CVSS 2.0 base score 7.5)
EPSS exploit prediction: 43% (99th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Php
Published: 2015-01-27
Last modified: 2026-06-17

Description

Use-after-free vulnerability in the process_nested_data function in ext/standard/var_unserializer.re in PHP before 5.4.37, 5.5.x before 5.5.21, and 5.6.x before 5.6.5 allows remote attackers to execute arbitrary code via a crafted unserialize call that leverages improper handling of duplicate numerical keys within the serialized properties of an object. NOTE: this vulnerability exists because of an incomplete fix for CVE-2014-8142.

Frequently asked questions

What is CVE-2015-0231?: Use-after-free vulnerability in the process_nested_data function in ext/standard/var_unserializer.re in PHP before 5.4.37, 5.5.x before 5.5.21, and 5.6.x before 5.6.5 allows remote attackers to execute arbitrary code via a crafted unserialize call that leverages improper handling of duplicate numerical keys within the serialized properties of an object. NOTE: this vulnerability exists because of an incomplete fix for CVE-2014-8142.
How severe is CVE-2015-0231?: CVE-2015-0231 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2015-0231 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 43% (99th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2015-0231?: CVE-2015-0231 primarily affects Php. In total, 84 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2015-0231?: 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-2015-0231 published?: CVE-2015-0231 was published on 2015-01-27 and last updated on 2026-06-17.

References

Affected products (84)

cpe:2.3:a:php:php:*:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.4.0:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.4.1:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.4.2:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.4.3:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.4.4:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.4.5:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.4.6:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.4.7:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.4.8:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.4.9:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.4.10:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.4.11:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.4.12:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.4.12:rc1:*:*:*:*:*:*
cpe:2.3:a:php:php:5.4.12:rc2:*:*:*:*:*:*
cpe:2.3:a:php:php:5.4.13:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.4.13:rc1:*:*:*:*:*:*
cpe:2.3:a:php:php:5.4.14:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.4.14:rc1:*:*:*:*:*:*
cpe:2.3:a:php:php:5.4.15:rc1:*:*:*:*:*:*
cpe:2.3:a:php:php:5.4.16:rc1:*:*:*:*:*:*
cpe:2.3:a:php:php:5.4.17:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.4.18:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.4.19:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.4.20:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.4.21:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.4.22:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.4.23:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.4.24:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.4.25:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.4.26:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.4.27:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.4.28:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.4.29:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.4.30:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.4.34:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.4.35:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.5.0:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.5.0:alpha1:*:*:*:*:*:*

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All CVEs affecting Php →

Threat intelligence

Threat-intel indicators referencing this CVE:

45.84.120.3 (ipv4-addr)
221.161.235.168 (ipv4-addr)
200.196.50.91 (ipv4-addr)
187.141.71.166 (ipv4-addr)
187.110.238.50 (ipv4-addr)
116.255.252.44 (ipv4-addr)
113.164.66.10 (ipv4-addr)
103.38.219.22 (ipv4-addr)