CVE-2016-6295

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
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 5%CVSS: 9.8Exploit: NoneExposed: 0

A fix is available — apply it.

ext/snmp/snmp.c in PHP before 5.5.38, 5.6.x before 5.6.24, and 7.x before 7.0.9 improperly interacts with the unserialize implementation and garbage collection, which allows remote attackers to cause a denial of service (use-after-free and application crash) or possibly have unspecified other impact via crafted serialized data, a related issue to CVE-2016-5773.

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%
Exploitation5% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
91.9%
KEV
Not listed

Published

July 25, 2016

Last Modified

May 6, 2026

Advisory Details (7)

Auto-updated May 8, 2026
No patch confirmed yet.
generic

PHP :: Sec Bug #72479 :: Use After Free Vulnerability in SNMP with GC and unserialize()

https://bugs.php.net/72479
generic
http://www.securityfocus.com/bid/92094
generic

[SECURITY] [DSA 3631-1] php5 security update

http://www.debian.org/security/2016/dsa-3631
generic
http://rhn.redhat.com/errata/RHSA-2016-2750.html
generic

PHP: PHP 7 ChangeLog

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

PHP: PHP 5 ChangeLog

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

oss-security - Re: Fwd: CVE for PHP 5.5.38 issues

http://openwall.com/lists/oss-security/2016/07/24/2

Vendor Advisories for CVE-2016-6295(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
ubuntuphp5-xsl (5.5.9+dfsg-1ubuntu4.19) @ trusty2026-05-20ubuntu
redhatrh-php56-php-pear-1:1.9.5-4.el72016-11-15redhat

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 13× in last 7d / 41× 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 114 total refreshes for this CVE.

  1. 2026-07-23 14:15 UTCEPSS rescore
  2. 2026-07-23 01:23 UTCEG score recompute
  3. 2026-07-22 22:03 UTCEG score recompute
  4. 2026-07-22 14:04 UTCEPSS rescore
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  23. 2026-07-09 19:06 UTCEPSS rescore
  24. 2026-07-08 15:10 UTCEPSS rescore
  25. 2026-07-08 09:05 UTCOSV refresh
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  1. 2026-07-06 16:24 UTCEPSS rescore
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  20. 2026-06-21 01:57 UTCEPSS rescore
  21. 2026-06-21 01:57 UTCEPSS rescore
  22. 2026-06-19 20:53 UTCOSV refresh
  23. 2026-06-19 19:23 UTCEPSS rescore
  24. 2026-06-19 19:23 UTCEPSS rescore
  25. 2026-06-18 17:50 UTCEPSS rescore
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  27. 2026-06-17 17:50 UTCEPSS rescore
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  37. 2026-06-08 14:14 UTCEPSS rescore
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  40. 2026-06-06 13:45 UTCEPSS rescore
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  45. 2026-06-04 13:10 UTCEPSS rescore
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  48. 2026-06-01 13:49 UTCEPSS rescore
  49. 2026-06-01 13:49 UTCEPSS rescore
  50. 2026-05-31 22:28 UTCEPSS rescore
  51. 2026-05-31 22:28 UTCEPSS rescore
  52. 2026-05-31 00:55 UTCOSV refresh
  53. 2026-05-31 00:14 UTCEPSS rescore
  54. 2026-05-29 13:41 UTCEPSS rescore
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  68. 2026-05-20 10:02 UTCVendor advisory
  69. 2026-05-20 10:02 UTCGHSA enrichment
  70. 2026-05-20 05:54 UTCVendor advisory
  71. 2026-05-20 05:54 UTCGHSA enrichment
  72. 2026-05-20 01:45 UTCVendor advisory
  73. 2026-05-20 01:45 UTCGHSA enrichment
  74. 2026-05-19 21:37 UTCVendor advisory
  75. 2026-05-19 21:37 UTCGHSA enrichment

Related CVEs(same vendor)

Frequently asked(5)

What is CVE-2016-6295?
CVE-2016-6295 is a critical vulnerability published on July 25, 2016. ext/snmp/snmp.c in PHP before 5.5.38, 5.6.x before 5.6.24, and 7.x before 7.0.9 improperly interacts with the unserialize implementation and garbage collection, which allows remote attackers to cause a denial of service (use-after-free and application crash) or possibly have unspecified other…
When was CVE-2016-6295 disclosed?
CVE-2016-6295 was first published in the National Vulnerability Database on July 25, 2016, 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-2016-6295 actively exploited?
CVE-2016-6295 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 91.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2016-6295?
CVE-2016-6295 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2016-6295?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2016-6295, 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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