CVE-2015-4643

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-13. 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: 17%CVSS: 9.8Exploit: Elevated riskExposed: 0

A fix is available — apply it.

Integer overflow in the ftp_genlist function in ext/ftp/ftp.c in PHP before 5.4.42, 5.5.x before 5.5.26, and 5.6.x before 5.6.10 allows remote FTP servers to execute arbitrary code via a long reply to a LIST command, leading to a heap-based buffer overflow. NOTE: this vulnerability exists because of an incomplete fix for CVE-2015-4022.

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 PROB
17%
EPSS %ILE
97%
KEV
Not listed

Published

May 16, 2016

Last Modified

June 17, 2026

Advisory Details (8)

Auto-updated Aug 18, 2026
No patch confirmed yet.
generic

CVE-2015-4643 - PSIRT.COM

http://www.securityfocus.com/bid/75291
generic

[SECURITY] [DSA 3344-1] php5 security update

http://www.debian.org/security/2015/dsa-3344
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

oss-security - Re: PHP 5.6.10 / 5.5.26 / 5.4.42 CVE request

http://openwall.com/lists/oss-security/2015/06/18/6

Vendor Advisories for CVE-2015-4643(4)

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 / EcosystemFixed in / PatchReleasedSource
ubuntuphp5-fpm (5.6.4+dfsg-4ubuntu6.2) @ vivid2026-05-20ubuntu
redhatphp-0:5.3.3-46.el6_62015-07-09redhat
redhatphp54-php-0:5.4.40-3.el72015-07-09redhat
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

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.

Affected Packages

(3 across 3 ecosystems)
Debian:6.0(1)
PackageVulnerable rangeFixed inDependents
php55.3.3-7 ... 5.3.3.1-7+squeeze26 (23 versions)5.3.3.1-7+squeeze27—
Debian:7(1)
PackageVulnerable rangeFixed inDependents
php55.4.11-1 ... 5.4.9-4 (34 versions)5.4.44-0+deb7u1—
Debian:8(1)
PackageVulnerable rangeFixed inDependents
php55.6.11+dfsg-1, 5.6.7+dfsg-1, 5.6.9+dfsg-0+deb8u1, 5.6.9+dfsg-15.6.12+dfsg-0+deb8u1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

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 7× in last 7d / 24× 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 131 total refreshes for this CVE.

  1. 2026-08-21 23:44 UTCEPSS rescore
  2. 2026-08-20 22:50 UTCEPSS rescore
  3. 2026-08-19 16:59 UTCEPSS rescore
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  23. 2026-07-23 01:18 UTCEG score recompute
  24. 2026-07-23 00:20 UTCEG score recompute
  25. 2026-07-22 21:58 UTCEG score recompute
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  49. 2026-06-13 22:57 UTCEPSS rescore
  50. 2026-06-12 23:09 UTCEPSS rescore
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Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2015-4643?
CVE-2015-4643 is a critical vulnerability published on May 16, 2016. Integer overflow in the ftp_genlist function in ext/ftp/ftp.c in PHP before 5.4.42, 5.5.x before 5.5.26, and 5.6.x before 5.6.10 allows remote FTP servers to execute arbitrary code via a long reply to a LIST command, leading to a heap-based buffer overflow. NOTE: this vulnerability exists because…
When was CVE-2015-4643 disclosed?
CVE-2015-4643 was first published in the National Vulnerability Database 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-2015-4643 actively exploited?
CVE-2015-4643 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 17% probability of exploitation in the next 30 days, which ranks it in the top 3.2% of all scored CVEs.
What is the CVSS score of CVE-2015-4643?
CVE-2015-4643 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2015-4643?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2015-4643, 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.

Dependency Blast Radius

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