CVE-2017-12933

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
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 7%CVSS: 9.8Exploit: None knownExposed: 0

A fix is available — apply it.

The finish_nested_data function in ext/standard/var_unserializer.re in PHP before 5.6.31, 7.0.x before 7.0.21, and 7.1.x before 7.1.7 is prone to a buffer over-read while unserializing untrusted data. Exploitation of this issue can have an unspecified impact on the integrity of PHP.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
51(Track)
EG Risk 51/100SSVC: 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%
Exploitation7% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
7%
EPSS %ILE
94%
KEV
Not listed

Published

August 18, 2017

Last Modified

June 17, 2026

Advisory Details (7)

Auto-updated Aug 25, 2026
Patch available. Sources: redhat.
generic

PHP: PHP 5 ChangeLog

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

[SECURITY] [DSA 4081-1] php5 security update

https://www.debian.org/security/2018/dsa-4081
generic

[SECURITY] [DSA 4080-1] php7.0 security update

https://www.debian.org/security/2018/dsa-4080
generic

PHP :: Sec Bug #74111 :: Heap buffer overread (READ: 1) finish_nested_data from unserialize

https://bugs.php.net/bug.php?id=74111
redhat Patch Available
https://access.redhat.com/errata/RHSA-2018:1296
generic

CVE-2017-12933 - PSIRT.COM

http://www.securityfocus.com/bid/99490
generic

PHP: PHP 7 ChangeLog

http://php.net/ChangeLog-7.php

Patch Availability(3)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuphp5-xsl (5.5.9+dfsg-1ubuntu4.23) @ trusty2026-05-20ubuntu
ubuntulibphp5-embed (5.5.9+dfsg-1ubuntu4.29+esm2) @ trusty2026-05-20ubuntu
redhatrh-php70-php-0:7.0.27-1.el72018-05-03redhat

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:7(1)
PackageVulnerable rangeFixed inDependents
php55.4.11-1 ... 5.4.9-4 (45 versions)5.4.45-0+deb7u11—
Debian:8(1)
PackageVulnerable rangeFixed inDependents
php55.6.11+dfsg-1 ... 5.6.9+dfsg-1 (40 versions)5.6.33+dfsg-0+deb8u1—
Debian:9(1)
PackageVulnerable rangeFixed inDependents
php7.07.0.19-1 ... 7.0.26-1 (8 versions)7.0.27-0+deb9u1—

Weakness Classification(1)

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

All Vendor Advisories

(3)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 5× in last 7d / 25× 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 130 total refreshes for this CVE.

  1. 2026-08-26 14:41 UTCEPSS rescore
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  46. 2026-06-19 15:55 UTCOSV refresh
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Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2017-12933?
CVE-2017-12933 is a critical vulnerability published on August 18, 2017. The finishnesteddata function in ext/standard/var_unserializer.re in PHP before 5.6.31, 7.0.x before 7.0.21, and 7.1.x before 7.1.7 is prone to a buffer over-read while unserializing untrusted data. Exploitation of this issue can have an unspecified impact on the integrity of PHP.
When was CVE-2017-12933 disclosed?
CVE-2017-12933 was first published in the National Vulnerability Database on August 18, 2017, 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-2017-12933 actively exploited?
CVE-2017-12933 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 7% probability of exploitation in the next 30 days, which ranks it in the top 6.4% of all scored CVEs.
What is the CVSS score of CVE-2017-12933?
CVE-2017-12933 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2017-12933?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2017-12933, 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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