CVE-2017-5340

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: 17%CVSS: 9.8Exploit: NoneExposed: 0

A fix is available — apply it.

Zend/zend_hash.c in PHP before 7.0.15 and 7.1.x before 7.1.1 mishandles certain cases that require large array allocations, which allows remote attackers to execute arbitrary code or cause a denial of service (integer overflow, uninitialized memory access, and use of arbitrary destructor function pointers) via crafted serialized data.

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
96.7%
KEV
Not listed

Published

January 11, 2017

Last Modified

May 6, 2026

Advisory Details (5)

Auto-updated May 9, 2026
🔬 Proof of concept available. Patch available. Sources: redhat.
generic🟡 PoC Available

PHP :: Sec Bug #73832 :: Use of uninitialized memory in unserialize()

https://bugs.php.net/bug.php?id=73832
redhat Patch Available
https://access.redhat.com/errata/RHSA-2018:1296
generic
http://www.securityfocus.com/bid/95371
generic

NetApp Product Security

https://security.netapp.com/advisory/ntap-20180112-0001/
generic

Fix #73832 - leave the table in a safe state if the size is too big. · php/php-src@4cc0286 · GitHub

https://github.com/php/php-src/commit/4cc0286f2f3780abc6084bcdae5dce595daa3c12

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuphp7.0-fpm (7.0.15-0ubuntu0.16.10.2) @ yakkety2026-05-20ubuntu
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.

All Vendor Advisories

(2)

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 11× in last 7d / 36× 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 112 total refreshes for this CVE.

  1. 2026-07-23 14:15 UTCEPSS rescore
  2. 2026-07-23 01:29 UTCEG score recompute
  3. 2026-07-22 22:09 UTCEG score recompute
  4. 2026-07-22 14:04 UTCEPSS rescore
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  22. 2026-07-08 06:57 UTCOSV refresh
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  1. 2026-07-05 02:27 UTCEPSS rescore
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  17. 2026-06-21 01:57 UTCEPSS rescore
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  19. 2026-06-19 18:55 UTCOSV refresh
  20. 2026-06-18 17:50 UTCEPSS rescore
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  22. 2026-06-16 17:50 UTCEPSS rescore
  23. 2026-06-16 17:50 UTCEPSS rescore
  24. 2026-06-15 17:45 UTCEPSS rescore
  25. 2026-06-14 23:14 UTCEPSS rescore
  26. 2026-06-13 22:57 UTCEPSS rescore
  27. 2026-06-12 23:09 UTCEPSS rescore
  28. 2026-06-10 22:15 UTCEPSS rescore
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  45. 2026-05-31 00:14 UTCEPSS rescore
  46. 2026-05-31 00:14 UTCEPSS rescore
  47. 2026-05-30 23:53 UTCOSV refresh
  48. 2026-05-29 13:41 UTCEPSS rescore
  49. 2026-05-28 13:42 UTCEPSS rescore
  50. 2026-05-28 13:42 UTCEPSS rescore
  51. 2026-05-27 13:38 UTCEPSS rescore
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  68. 2026-05-20 09:29 UTCVendor advisory
  69. 2026-05-20 09:29 UTCGHSA enrichment
  70. 2026-05-20 05:22 UTCVendor advisory
  71. 2026-05-20 05:22 UTCGHSA enrichment
  72. 2026-05-20 01:17 UTCVendor advisory
  73. 2026-05-20 01:17 UTCGHSA enrichment
  74. 2026-05-19 21:11 UTCVendor advisory
  75. 2026-05-19 21:11 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2017-5340?
CVE-2017-5340 is a critical vulnerability published on January 11, 2017. Zend/zend_hash.c in PHP before 7.0.15 and 7.1.x before 7.1.1 mishandles certain cases that require large array allocations, which allows remote attackers to execute arbitrary code or cause a denial of service (integer overflow, uninitialized memory access, and use of arbitrary destructor function…
When was CVE-2017-5340 disclosed?
CVE-2017-5340 was first published in the National Vulnerability Database on January 11, 2017, 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-2017-5340 actively exploited?
CVE-2017-5340 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 96.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2017-5340?
CVE-2017-5340 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2017-5340?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2017-5340, 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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