CVE-2016-5399

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2022-05-14. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Weaponized
7.8EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • Public exploit code is available (Exploit-DB (verified), epss top5pct, public exploit)
CISA-KEV: Not listedEPSS PROB: 10%CVSS: 7.8Exploit: Exploit-DB (verified) · epss top5pct · public exploitExposed: 0

A fix is available — apply it.

The bzread function in ext/bz2/bz2.c in PHP before 5.5.38, 5.6.x before 5.6.24, and 7.x before 7.0.9 allows remote attackers to cause a denial of service (out-of-bounds write) or execute arbitrary code via a crafted bz2 archive.

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
66(Track)
EG Risk 66/100SSVC: 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
Severity78% × 45%
Exploitation65% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
10%
EPSS %ILE
95%
KEV
Not listed

Published

April 21, 2017

Last Modified

June 17, 2026

References (30)

Vendor Advisories for CVE-2016-5399(1)

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

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatrh-php56-php-pear-1:1.9.5-4.el72016-11-15redhat
redhatphp-0:5.4.16-42.el72016-11-03redhat

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

(2 across 2 ecosystems)
Debian:7(1)
PackageVulnerable rangeFixed inDependents
php55.4.11-1 ... 5.4.9-4 (39 versions)5.4.45-0+deb7u5—
Debian:8(1)
PackageVulnerable rangeFixed inDependents
php55.6.11+dfsg-1 ... 5.6.9+dfsg-1 (32 versions)5.6.24+dfsg-0+deb8u1—

Weakness Classification(1)

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

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 7× 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 120 total refreshes for this CVE.

  1. 2026-08-21 23:44 UTCEPSS rescore
  2. 2026-08-19 16:59 UTCEPSS rescore
  3. 2026-08-18 13:43 UTCEPSS rescore
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  8. 2026-08-14 02:48 UTCOSV refresh
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  20. 2026-07-29 07:33 UTCOSV refresh
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  25. 2026-07-23 01:23 UTCEG score recompute
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  1. 2026-07-22 22:02 UTCEG score recompute
  2. 2026-07-22 14:04 UTCEPSS rescore
  3. 2026-07-21 15:21 UTCEPSS rescore
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  18. 2026-07-12 05:43 UTCEPSS rescore
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  20. 2026-07-12 00:11 UTCOSV refresh
  21. 2026-07-11 08:23 UTCEPSS rescore
  22. 2026-07-09 19:05 UTCEPSS rescore
  23. 2026-07-08 15:10 UTCEPSS rescore
  24. 2026-07-07 13:42 UTCEPSS rescore
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  27. 2026-07-05 02:27 UTCEPSS rescore
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  39. 2026-06-23 06:30 UTCOSV refresh
  40. 2026-06-21 14:54 UTCEPSS rescore
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  44. 2026-06-19 19:23 UTCEPSS rescore
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  46. 2026-06-18 17:50 UTCEPSS rescore
  47. 2026-06-17 17:50 UTCEPSS rescore
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  49. 2026-06-16 17:50 UTCEPSS rescore
  50. 2026-06-16 17:50 UTCEPSS rescore
  51. 2026-06-15 17:45 UTCEPSS rescore
  52. 2026-06-14 23:14 UTCEPSS rescore
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  55. 2026-06-12 23:09 UTCEPSS rescore
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  63. 2026-06-06 13:45 UTCEPSS rescore
  64. 2026-06-06 05:07 UTCOSV refresh
  65. 2026-06-05 22:44 UTCEPSS rescore
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  71. 2026-05-31 22:28 UTCEPSS rescore
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  73. 2026-05-31 00:14 UTCEPSS rescore
  74. 2026-05-29 13:41 UTCEPSS rescore
  75. 2026-05-28 13:42 UTCEPSS rescore

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-40155✓ verified
    First seen Jul 25, 2016

    PHP 5.5.37/5.6.23/7.0.8 - 'bzread()' Out-of-Bounds Write

    Open source ↗

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2016-5399?
CVE-2016-5399 is a high vulnerability published on April 21, 2017. The bzread function in ext/bz2/bz2.c in PHP before 5.5.38, 5.6.x before 5.6.24, and 7.x before 7.0.9 allows remote attackers to cause a denial of service (out-of-bounds write) or execute arbitrary code via a crafted bz2 archive.
When was CVE-2016-5399 disclosed?
CVE-2016-5399 was first published in the National Vulnerability Database on April 21, 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-2016-5399 actively exploited?
CVE-2016-5399 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 10% probability of exploitation in the next 30 days, which ranks it in the top 4.8% of all scored CVEs.
What is the CVSS score of CVE-2016-5399?
CVE-2016-5399 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2016-5399?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2016-5399, 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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