CVE-2015-4603

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
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 11%CVSS: 9.8Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

The exception::getTraceAsString function in Zend/zend_exceptions.c 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 execute arbitrary code via an unexpected data type, related to a "type confusion" issue.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
65
EG Risk 65/100CISA SSVC

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%
CISA SSVC: Track at low, Track* at medium and Attend at high mission impact.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
11%
EPSS %ILE
95th
KEV
Not listed

CISA SSVCTrack at low, Track* at medium and Attend at high mission impact.

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (EG-KEV: elevated) · Automatable unknown (not published for this CVE) · Technical impact total (CVSS ≥ 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

May 16, 2016

Last Modified

June 17, 2026

Advisory Details (9)

Auto-updated Sep 30, 2026
Patch available.
generic

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

https://bugs.php.net/bug.php?id=69152
generic

CVE-2015-4603 - PSIRT.COM

http://www.securityfocus.com/bid/75252
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-2015-1187.html
generic
http://rhn.redhat.com/errata/RHSA-2015-1186.html
generic
http://rhn.redhat.com/errata/RHSA-2015-1135.html
generic

PHP: PHP 5 ChangeLog

http://php.net/ChangeLog-5.php
generic
http://www.securitytracker.com/id/1032709

Vendor Advisories for CVE-2015-4603(5)

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

Patch Availability(6)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntuphp5-fpm (5.6.4+dfsg-4ubuntu6.2) @ vivid2026-05-20ubuntu
redhatphp-0:5.3.3-46.el6_62015-07-09redhat
redhatphp55-php-0:5.5.21-4.el72015-06-25redhat
redhatrh-php56-php-0:5.6.5-7.el72015-06-25redhat
redhatphp-0:5.4.16-36.ael7b_12015-06-23redhat
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

(1)

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 6× in last 7d / 19× 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 160 total refreshes for this CVE.

  1. 2026-10-05 17:38 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2015-4603?
CVE-2015-4603 is a critical vulnerability published on May 16, 2016. The exception::getTraceAsString function in Zend/zend_exceptions.c 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 execute arbitrary code via an unexpected data type, related to a "type confusion" issue.
When was CVE-2015-4603 disclosed?
CVE-2015-4603 was first published on May 16, 2016, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2015-4603 actively exploited?
CVE-2015-4603 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 11% probability of exploitation in the next 30 days (95th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2015-4603?
CVE-2015-4603 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2015-4603?
A fix for CVE-2015-4603 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2015-4603 are linked in the Vendor Advisories panel on this page.

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