CVE-2015-2787

Exp

Use-after-free vulnerability in the process_nested_data function in ext/standard/var_unserializer.re in PHP before 5.4.39, 5.5.x before 5.5.23, and 5.6.x before 5.6.7 allows remote attackers to execute arbitrary code via a crafted unserialize call that leverages use of the unset function within an __wakeup function, a related issue to CVE-2015-0231.

Published: 2015-03-30 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2015-2787 is rated High Exploit Risk (78.4/100): CVSS High severity, with high exploitation likelihood (EPSS 12.22%, 96th percentile). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2015-2787

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2015-2787

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-07-11 12.30% 12.22% -0.08%
2 2026-06-27 11.98% 12.30% +0.32%
3 2026-06-15 — 11.98% —

Full EPSS history (47 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2015-2787

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 2.0 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-2015-2787

OS Trackers for CVE-2015-2787

vendor priority summary link
gentoo normal CVE-2015-2787: 1 GLSA(s) (201606-10), 1 atom(s) (dev-lang/php); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2015-2787
redhat medium — https://access.redhat.com/security/cve/CVE-2015-2787
ubuntu medium CVE-2015-2787 medium priority: Ubuntu including 1 source packages (php5), 5 status rows across 5 suites (lucid, precise, trusty, upstream, utopic): released 5. https://ubuntu.com/security/CVE-2015-2787

NVD evaluator notes for CVE-2015-2787

Comment: <a href="http://cwe.mitre.org/data/definitions/416.html">CWE-416: Use After Free</a>

Affected software / configurations for CVE-2015-2787

Vendor Product Version Raw CPE
php php <= 5.4.38 cpe:2.3:a:php:php:*:*:*:*:*:*:*:*
php php 5.5.0 cpe:2.3:a:php:php:5.5.0:*:*:*:*:*:*:*
php php 5.5.0 cpe:2.3:a:php:php:5.5.0:alpha1:*:*:*:*:*:*
php php 5.5.0 cpe:2.3:a:php:php:5.5.0:alpha2:*:*:*:*:*:*
php php 5.5.0 cpe:2.3:a:php:php:5.5.0:alpha3:*:*:*:*:*:*
php php 5.5.0 cpe:2.3:a:php:php:5.5.0:alpha4:*:*:*:*:*:*
php php 5.5.0 cpe:2.3:a:php:php:5.5.0:alpha5:*:*:*:*:*:*
php php 5.5.0 cpe:2.3:a:php:php:5.5.0:alpha6:*:*:*:*:*:*
php php 5.5.0 cpe:2.3:a:php:php:5.5.0:beta1:*:*:*:*:*:*
php php 5.5.0 cpe:2.3:a:php:php:5.5.0:beta2:*:*:*:*:*:*
php php 5.5.0 cpe:2.3:a:php:php:5.5.0:beta3:*:*:*:*:*:*
php php 5.5.0 cpe:2.3:a:php:php:5.5.0:beta4:*:*:*:*:*:*
php php 5.5.0 cpe:2.3:a:php:php:5.5.0:rc1:*:*:*:*:*:*
php php 5.5.0 cpe:2.3:a:php:php:5.5.0:rc2:*:*:*:*:*:*
php php 5.5.1 cpe:2.3:a:php:php:5.5.1:*:*:*:*:*:*:*
php php 5.5.2 cpe:2.3:a:php:php:5.5.2:*:*:*:*:*:*:*
php php 5.5.3 cpe:2.3:a:php:php:5.5.3:*:*:*:*:*:*:*
php php 5.5.4 cpe:2.3:a:php:php:5.5.4:*:*:*:*:*:*:*
php php 5.5.5 cpe:2.3:a:php:php:5.5.5:*:*:*:*:*:*:*
php php 5.5.6 cpe:2.3:a:php:php:5.5.6:*:*:*:*:*:*:*
php php 5.5.7 cpe:2.3:a:php:php:5.5.7:*:*:*:*:*:*:*
php php 5.5.8 cpe:2.3:a:php:php:5.5.8:*:*:*:*:*:*:*
php php 5.5.9 cpe:2.3:a:php:php:5.5.9:*:*:*:*:*:*:*
php php 5.5.10 cpe:2.3:a:php:php:5.5.10:*:*:*:*:*:*:*
php php 5.5.11 cpe:2.3:a:php:php:5.5.11:*:*:*:*:*:*:*
php php 5.5.12 cpe:2.3:a:php:php:5.5.12:*:*:*:*:*:*:*
php php 5.5.13 cpe:2.3:a:php:php:5.5.13:*:*:*:*:*:*:*
php php 5.5.14 cpe:2.3:a:php:php:5.5.14:*:*:*:*:*:*:*
php php 5.5.15 cpe:2.3:a:php:php:5.5.15:*:*:*:*:*:*:*
php php 5.5.16 cpe:2.3:a:php:php:5.5.16:*:*:*:*:*:*:*
php php 5.5.17 cpe:2.3:a:php:php:5.5.17:*:*:*:*:*:*:*
php php 5.5.18 cpe:2.3:a:php:php:5.5.18:*:*:*:*:*:*:*
php php 5.5.19 cpe:2.3:a:php:php:5.5.19:*:*:*:*:*:*:*
php php 5.5.20 cpe:2.3:a:php:php:5.5.20:*:*:*:*:*:*:*
php php 5.5.21 cpe:2.3:a:php:php:5.5.21:*:*:*:*:*:*:*
php php 5.5.22 cpe:2.3:a:php:php:5.5.22:*:*:*:*:*:*:*
php php 5.6.0 cpe:2.3:a:php:php:5.6.0:alpha1:*:*:*:*:*:*
php php 5.6.0 cpe:2.3:a:php:php:5.6.0:alpha2:*:*:*:*:*:*
php php 5.6.0 cpe:2.3:a:php:php:5.6.0:alpha3:*:*:*:*:*:*
php php 5.6.0 cpe:2.3:a:php:php:5.6.0:alpha4:*:*:*:*:*:*
php php 5.6.0 cpe:2.3:a:php:php:5.6.0:alpha5:*:*:*:*:*:*
php php 5.6.0 cpe:2.3:a:php:php:5.6.0:beta1:*:*:*:*:*:*
php php 5.6.0 cpe:2.3:a:php:php:5.6.0:beta2:*:*:*:*:*:*
php php 5.6.0 cpe:2.3:a:php:php:5.6.0:beta3:*:*:*:*:*:*
php php 5.6.0 cpe:2.3:a:php:php:5.6.0:beta4:*:*:*:*:*:*
php php 5.6.1 cpe:2.3:a:php:php:5.6.1:*:*:*:*:*:*:*
php php 5.6.2 cpe:2.3:a:php:php:5.6.2:*:*:*:*:*:*:*
php php 5.6.3 cpe:2.3:a:php:php:5.6.3:*:*:*:*:*:*:*
php php 5.6.4 cpe:2.3:a:php:php:5.6.4:*:*:*:*:*:*:*
php php 5.6.5 cpe:2.3:a:php:php:5.6.5:*:*:*:*:*:*:*
php php 5.6.6 cpe:2.3:a:php:php:5.6.6:*:*:*:*:*:*:*
apple mac_os_x <= 10.6.8 cpe:2.3:o:apple:mac_os_x:*:*:*:*:*:*:*:*
apple mac_os_x 10.9.5 cpe:2.3:o:apple:mac_os_x:10.9.5:*:*:*:*:*:*:*
apple mac_os_x 10.10.0 cpe:2.3:o:apple:mac_os_x:10.10.0:*:*:*:*:*:*:*
apple mac_os_x 10.10.1 cpe:2.3:o:apple:mac_os_x:10.10.1:*:*:*:*:*:*:*
apple mac_os_x 10.10.2 cpe:2.3:o:apple:mac_os_x:10.10.2:*:*:*:*:*:*:*
apple mac_os_x 10.10.3 cpe:2.3:o:apple:mac_os_x:10.10.3:*:*:*:*:*:*:*
apple mac_os_x 10.10.4 cpe:2.3:o:apple:mac_os_x:10.10.4:*:*:*:*:*:*:*
redhat enterprise_linux_desktop 7.0 cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:*
redhat enterprise_linux_hpc_node 7.0 cpe:2.3:o:redhat:enterprise_linux_hpc_node:7.0:*:*:*:*:*:*:*
redhat enterprise_linux_hpc_node_eus 7.1 cpe:2.3:o:redhat:enterprise_linux_hpc_node_eus:7.1:*:*:*:*:*:*:*
redhat enterprise_linux_server 7.0 cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:*
redhat enterprise_linux_server_eus 7.1 cpe:2.3:o:redhat:enterprise_linux_server_eus:7.1:*:*:*:*:*:*:*
redhat enterprise_linux_workstation 7.0 cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:*
opensuse opensuse 13.1 cpe:2.3:o:opensuse:opensuse:13.1:*:*:*:*:*:*:*
opensuse opensuse 13.2 cpe:2.3:o:opensuse:opensuse:13.2:*:*:*:*:*:*:*

References for CVE-2015-2787

URL Tags
http://lists.apple.com/archives/security-announce/2015/Aug/msg00001.html Vendor Advisory
http://lists.apple.com/archives/security-announce/2015/Sep/msg00008.html Vendor Advisory
http://lists.opensuse.org/opensuse-security-announce/2015-05/msg00005.html
http://lists.opensuse.org/opensuse-updates/2015-04/msg00015.html
http://marc.info/?l=bugtraq&m=143748090628601&w=2
http://marc.info/?l=bugtraq&m=144050155601375&w=2
http://php.net/ChangeLog-5.php
http://rhn.redhat.com/errata/RHSA-2015-1053.html
http://rhn.redhat.com/errata/RHSA-2015-1066.html
http://rhn.redhat.com/errata/RHSA-2015-1135.html
http://rhn.redhat.com/errata/RHSA-2015-1218.html
http://www.oracle.com/technetwork/topics/security/bulletinjul2015-2511963.html
http://www.oracle.com/technetwork/topics/security/linuxbulletinjan2016-2867209.html
http://www.securityfocus.com/bid/73431
http://www.securitytracker.com/id/1032485
http://www.ubuntu.com/usn/USN-2572-1
https://bugs.php.net/bug.php?id=68976 Exploit
https://gist.github.com/smalyshev/eea9eafc7c88a4a6d10d
https://security.gentoo.org/glsa/201606-10
https://support.apple.com/HT205267 Vendor Advisory
https://support.apple.com/kb/HT205031 Vendor Advisory
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