CVE-2015-4600

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-14. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 11%CVSS: 9.8Exploit: NoneExposed: 0

A fix is available — apply it.

The SoapClient implementation in PHP before 5.4.40, 5.5.x before 5.5.24, and 5.6.x before 5.6.8 allows remote attackers to cause a denial of service (application crash) or possibly execute arbitrary code via an unexpected data type, related to "type confusion" issues in the (1) SoapClient::__getLastRequest, (2) SoapClient::__getLastResponse, (3) SoapClient::__getLastRequestHeaders, (4) SoapClient::__getLastResponseHeaders, (5) SoapClient::__getCookies, and (6) SoapClient::__setCookie methods.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
65(Track*)
EG Risk 65/100SSVC: Track*

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation40% × 40%
Automatability30% × 15%
Action: Watch closely — could escalate to Attend.
EPSS
95.4%
KEV
Not listed

Published

May 16, 2016

Last Modified

May 6, 2026

Advisory Details (6)

Auto-updated May 8, 2026
No patch confirmed yet.
generic

PHP :: Sec Bug #69152 :: Type Confusion Infoleak Vulnerability in unserialize() with SoapFault

https://bugs.php.net/bug.php?id=69152
generic
http://www.securityfocus.com/bid/74413
generic

oss-security - Re: CVE Request: various issues in PHP

http://www.openwall.com/lists/oss-security/2015/06/16/12
generic
http://rhn.redhat.com/errata/RHSA-2015-1218.html
generic
http://rhn.redhat.com/errata/RHSA-2015-1135.html
generic

PHP: PHP 5 ChangeLog

http://php.net/ChangeLog-5.php

Vendor Advisories for CVE-2015-4600(3)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(5)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuphp5-fpm (5.5.12+dfsg-2ubuntu4.6) @ utopic2026-05-20ubuntu
redhatphp-0:5.3.3-46.el6_62015-07-09redhat
redhatphp-0:5.4.16-36.ael7b_12015-06-23redhat
redhatphp55-php-0:5.5.21-2.el72015-06-04redhat
redhatphp54-php-pecl-zendopcache-0:7.0.4-3.el72015-06-04redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Additional Vendor Advisories

(2)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 15× in last 7d / 40× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 111 total refreshes for this CVE.

  1. 2026-07-23 14:14 UTCEPSS rescore
  2. 2026-07-23 01:18 UTCEG score recompute
  3. 2026-07-23 00:20 UTCEG score recompute
  4. 2026-07-22 21:58 UTCEG score recompute
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  66. 2026-05-20 08:02 UTCVendor advisory
  67. 2026-05-20 08:02 UTCGHSA enrichment
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  72. 2026-05-19 20:22 UTCVendor advisory
  73. 2026-05-19 20:22 UTCGHSA enrichment
  74. 2026-05-19 16:26 UTCVendor advisory
  75. 2026-05-19 16:26 UTCGHSA enrichment

Related CVEs(same vendor)

Frequently asked(5)

What is CVE-2015-4600?
CVE-2015-4600 is a critical vulnerability published on May 16, 2016. The SoapClient implementation in PHP before 5.4.40, 5.5.x before 5.5.24, and 5.6.x before 5.6.8 allows remote attackers to cause a denial of service (application crash) or possibly execute arbitrary code via an unexpected data type, related to "type confusion" issues in the (1)…
When was CVE-2015-4600 disclosed?
CVE-2015-4600 was first published in the National Vulnerability Database on May 16, 2016, with the most recent update on May 6, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2015-4600 actively exploited?
CVE-2015-4600 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 95.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2015-4600?
CVE-2015-4600 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2015-4600?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2015-4600, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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