CVE-2017-16820

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
Trending — 3 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 4%CVSS: 9.8Exploit: None knownExposed: 0

A fix is available — apply it.

The csnmp_read_table function in snmp.c in the SNMP plugin in collectd before 5.6.3 is susceptible to a double free in a certain error case, which could lead to a crash (or potentially have other impact).

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
50(Track)
EG Risk 50/100SSVC: 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%
Exploitation4% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
4%
EPSS %ILE
89%
KEV
Not listed

Published

November 14, 2017

Last Modified

June 17, 2026

Advisory Details (10)

Auto-updated Jul 26, 2026
Patch available. Sources: redhat, github_commit, github_release.
generic

collectd: Multiple vulnerabilities (GLSA 201803-10) — Gentoo security

https://security.gentoo.org/glsa/201803-10
github_release Patch Available

5.6.3

Patch available: collectd/collectd collectd-5.6.3

https://github.com/collectd/collectd/releases/tag/collectd-5.6.3
generic

snmp plugin: double free or heap corruption · Issue #2291 · collectd/collectd · GitHub

https://github.com/collectd/collectd/issues/2291
github_commit Patch Available

commit d16c24542b2f (collectd/collectd)

Patch available: collectd/collectd collectd-5.6.3 (contains commit d16c24542b2f)

https://github.com/collectd/collectd/commit/d16c24542b2f96a194d43a73c2e5778822b9cb47
generic Patch Available

#881757 - collectd: CVE-2017-16820: snmp plugin: double free or heap corruption - Debian Bug report logs

https://bugs.debian.org/881757
redhat Patch Available

Affected: Red Hat Enterprise Linux 7.

https://access.redhat.com/errata/RHSA-2018:2615
redhat Patch Available

Affected: Red Hat Enterprise Linux 7.5.

https://access.redhat.com/errata/RHSA-2018:1605
redhat Patch Available
https://access.redhat.com/errata/RHSA-2018:0560
redhat Patch Available

Affected: Red Hat Enterprise Linux 7.

https://access.redhat.com/errata/RHSA-2018:0299
redhat Patch Available

Affected: Red Hat Enterprise Linux 7.

https://access.redhat.com/errata/RHSA-2018:0252

Patch Availability(5)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibcollectdclient-dev (5.5.1-1ubuntu0.1~esm1) @ xenial2026-05-20ubuntu
redhatcollectd-0:5.7.2-3.1.el7rhgs2018-09-04redhat
redhatintel-cmt-cat-0:1.0.1-1.el7ost2018-05-17redhat
redhatcollectd-0:5.8.0-3.el72018-03-20redhat
redhatcollectd-0:5.7.2-3.el7ost2018-02-13redhat

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.

Weakness Classification(1)

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

All Vendor Advisories

(6)

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 8× in last 7d / 39× 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. 2026-07-25 20:01 UTCOSV refresh
  2. 2026-07-25 14:13 UTCEPSS rescore
  3. 2026-07-23 14:15 UTCEPSS rescore
  4. 2026-07-23 01:28 UTCEG score recompute
  5. 2026-07-22 22:07 UTCEG score recompute
  6. 2026-07-22 14:04 UTCEPSS rescore
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  23. 2026-07-12 05:43 UTCEPSS rescore
  24. 2026-07-11 08:24 UTCEPSS rescore
  25. 2026-07-09 19:06 UTCEPSS rescore
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  1. 2026-07-08 15:10 UTCEPSS rescore
  2. 2026-07-08 14:45 UTCOSV refresh
  3. 2026-07-07 13:42 UTCEPSS rescore
  4. 2026-07-06 16:24 UTCEPSS rescore
  5. 2026-07-06 02:20 UTCEPSS rescore
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  10. 2026-06-30 23:19 UTCEPSS rescore
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  23. 2026-06-21 14:54 UTCEPSS rescore
  24. 2026-06-21 01:57 UTCEPSS rescore
  25. 2026-06-21 01:57 UTCEPSS rescore
  26. 2026-06-20 02:42 UTCOSV refresh
  27. 2026-06-18 17:50 UTCEPSS rescore
  28. 2026-06-17 17:50 UTCEPSS rescore
  29. 2026-06-16 17:50 UTCEPSS rescore
  30. 2026-06-15 17:45 UTCEPSS rescore
  31. 2026-06-14 23:14 UTCEPSS rescore
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  33. 2026-06-13 22:57 UTCEPSS rescore
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  36. 2026-06-10 22:15 UTCEPSS rescore
  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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  47. 2026-06-02 20:11 UTCEPSS rescore
  48. 2026-06-02 20:11 UTCEPSS rescore
  49. 2026-05-31 22:28 UTCEPSS rescore
  50. 2026-05-31 03:55 UTCOSV refresh
  51. 2026-05-31 00:14 UTCEPSS rescore
  52. 2026-05-29 13:41 UTCEPSS rescore
  53. 2026-05-28 13:42 UTCEPSS rescore
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  68. 2026-05-20 10:59 UTCVendor advisory
  69. 2026-05-20 10:59 UTCGHSA enrichment
  70. 2026-05-20 07:02 UTCVendor advisory
  71. 2026-05-20 07:02 UTCGHSA enrichment
  72. 2026-05-20 03:05 UTCVendor advisory
  73. 2026-05-20 03:05 UTCGHSA enrichment
  74. 2026-05-19 23:09 UTCVendor advisory
  75. 2026-05-19 23:09 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2017-16820?
CVE-2017-16820 is a critical vulnerability published on November 14, 2017. The csnmpreadtable function in snmp.c in the SNMP plugin in collectd before 5.6.3 is susceptible to a double free in a certain error case, which could lead to a crash (or potentially have other impact).
When was CVE-2017-16820 disclosed?
CVE-2017-16820 was first published in the National Vulnerability Database on November 14, 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-2017-16820 actively exploited?
CVE-2017-16820 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 4% probability of exploitation in the next 30 days, which ranks it in the top 10.5% of all scored CVEs.
What is the CVSS score of CVE-2017-16820?
CVE-2017-16820 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2017-16820?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2017-16820, 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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