CVE-2015-4599

30

FAUCET Score

CVE-2015-4599 is a critical type confusion vulnerability in the SoapFault::__toString method within PHP versions prior to 5.4.40, 5.5.24, and 5.6.8, also affecting Red Hat distributions. With a CVSS score of 9.8, it allows remote attackers to achieve sensitive information disclosure, denial of service, or potentially arbitrary code execution with low attack complexity and no user interaction required. Despite its critical severity, there is no known active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this vulnerability.

Impacted Technologies

Vendor	Product	Version(s)	CPE
		<= 5.4.39CPE matchmatch criteria	cpe:2.3:a:php:php::::::::
		5.5.0CPE matchmatch criteria	cpe:2.3:a:php:php:5.5.0:::::::*
		5.5.1CPE matchmatch criteria	cpe:2.3:a:php:php:5.5.1:::::::*
		5.5.2CPE matchmatch criteria	cpe:2.3:a:php:php:5.5.2:::::::*
		5.5.3CPE matchmatch criteria	cpe:2.3:a:php:php:5.5.3:::::::*

CVSS Data

CVSS version used by this source: 3.0

9.8CRITICAL

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

Exploitability Score

3.9

Impact Score

5.9

CvssVersion

3.0

Exploit Intelligence

EPSS Score

10.72%

Probability of exploitation in next 30 days

EPSS Percentile

95.4%

Percentile rank of EPSS score among Peer Group

As of 2026-07-27

Model: v2026.06.15

This CVE's current EPSS score of 0.1072 is in the 91st percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (26)

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 6Fixed in: php-0:5.3.3-46.el6_6

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 7Fixed in: php-0:5.4.16-36.ael7b_1

redhatpatch availablevia redhat_api

Product: Red Hat Software Collections for Red Hat Enterprise Linux 6Fixed in: php55-0:2.0-1.el6

redhatpatch availablevia redhat_api

Product: Red Hat Software Collections for Red Hat Enterprise Linux 6Fixed in: php55-php-0:5.5.21-2.el6

redhatpatch availablevia redhat_api

Product: Red Hat Software Collections for Red Hat Enterprise Linux 6Fixed in: php54-0:2.0-1.el6

redhatpatch availablevia redhat_api

Product: Red Hat Software Collections for Red Hat Enterprise Linux 6Fixed in: php54-php-0:5.4.40-1.el6

redhatpatch availablevia redhat_api

Product: Red Hat Software Collections for Red Hat Enterprise Linux 6Fixed in: php54-php-pecl-zendopcache-0:7.0.4-3.el6

redhatpatch availablevia redhat_api

Product: Red Hat Software Collections for Red Hat Enterprise Linux 6.5 EUSFixed in: php55-0:2.0-1.el6

redhatpatch availablevia redhat_api

Product: Red Hat Software Collections for Red Hat Enterprise Linux 6.5 EUSFixed in: php55-php-0:5.5.21-2.el6

redhatpatch availablevia redhat_api

Product: Red Hat Software Collections for Red Hat Enterprise Linux 6.5 EUSFixed in: php54-0:2.0-1.el6

redhatpatch availablevia redhat_api

Product: Red Hat Software Collections for Red Hat Enterprise Linux 6.5 EUSFixed in: php54-php-0:5.4.40-1.el6

redhatpatch availablevia redhat_api

Product: Red Hat Software Collections for Red Hat Enterprise Linux 6.5 EUSFixed in: php54-php-pecl-zendopcache-0:7.0.4-3.el6

redhatpatch availablevia redhat_api

Product: Red Hat Software Collections for Red Hat Enterprise Linux 6.6 EUSFixed in: php55-0:2.0-1.el6

redhatpatch availablevia redhat_api

Product: Red Hat Software Collections for Red Hat Enterprise Linux 6.6 EUSFixed in: php55-php-0:5.5.21-2.el6

redhatpatch availablevia redhat_api

Product: Red Hat Software Collections for Red Hat Enterprise Linux 6.6 EUSFixed in: php54-0:2.0-1.el6

redhatpatch availablevia redhat_api

Product: Red Hat Software Collections for Red Hat Enterprise Linux 6.6 EUSFixed in: php54-php-0:5.4.40-1.el6

redhatpatch availablevia redhat_api

Product: Red Hat Software Collections for Red Hat Enterprise Linux 6.6 EUSFixed in: php54-php-pecl-zendopcache-0:7.0.4-3.el6

redhatpatch availablevia redhat_api

Product: Red Hat Software Collections for Red Hat Enterprise Linux 7Fixed in: php55-0:2.0-1.el7

redhatpatch availablevia redhat_api

Product: Red Hat Software Collections for Red Hat Enterprise Linux 7Fixed in: php55-php-0:5.5.21-2.el7

redhatpatch availablevia redhat_api

Product: Red Hat Software Collections for Red Hat Enterprise Linux 7Fixed in: php54-0:2.0-1.el7

redhatpatch availablevia redhat_api

Product: Red Hat Software Collections for Red Hat Enterprise Linux 7Fixed in: php54-php-0:5.4.40-1.el7

redhatpatch availablevia redhat_api

Product: Red Hat Software Collections for Red Hat Enterprise Linux 7Fixed in: php54-php-pecl-zendopcache-0:7.0.4-3.el7

redhatno patchvia redhat_api

Product: Red Hat Software CollectionsFixed in: php54-php

redhatno patchvia redhat_api

Product: Red Hat Software CollectionsFixed in: php55-php

redhatend of lifevia redhat_api

Product: Red Hat Enterprise Linux 5Fixed in: php

redhatend of lifevia redhat_api

Product: Red Hat Enterprise Linux 5Fixed in: php53

Vendor Advisories (1)

redhatCVE-2015-4599Moderate

php: type confusion issue in unserialize() with various SOAP methods

References

php.net / ChangeLog-5.php

rhn.redhat.com / errata/RHSA-2015-1135.html

rhn.redhat.com / errata/RHSA-2015-1218.html

bugs.php.net / bug.php

Exploit

openwall.com / lists/oss-security/2015/06/16/12

oracle.com / technetwork/topics/security/linuxbulletinjan2016-2867209.html

securityfocus.com / bid/75251

securitytracker.com / id/1032709