CVE-2016-5423

HIGHNVD 8.38.3—
EchelonGraph scoreMEDIUM confidence

Score 8.3 from GitHub Security Advisory (severity: HIGH) published 2022-05-14. NVD baseline CVSS 8.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
8.3EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 6%CVSS: 8.3Exploit: None knownExposed: 0

A fix is available — apply it.

PostgreSQL before 9.1.23, 9.2.x before 9.2.18, 9.3.x before 9.3.14, 9.4.x before 9.4.9, and 9.5.x before 9.5.4 allow remote authenticated users to cause a denial of service (NULL pointer dereference and server crash), obtain sensitive memory information, or possibly execute arbitrary code via (1) a CASE expression within the test value subexpression of another CASE or (2) inlining of an SQL function that implements the equality operator used for a CASE expression involving values of different types.

CVSS v3
8.3
EG Score
8.3(medium)
EG Risk
44(Track)
EG Risk 44/100SSVC: 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
Severity83% × 45%
Exploitation6% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
6%
EPSS %ILE
93%
KEV
Not listed

Published

December 9, 2016

Last Modified

June 17, 2026

Advisory Details (9)

Auto-updated Sep 5, 2026
Patch available. Sources: redhat.
generic

PostgreSQL: Multiple vulnerabilities (GLSA 201701-33) — Gentoo security

https://security.gentoo.org/glsa/201701-33
redhat Patch Available

1364001 – (CVE-2016-5423) CVE-2016-5423 postgresql: CASE/WHEN with inlining can cause untrusted pointer dereference

Affected: Red Hat Enterprise Linux 6.6 EUS

https://bugzilla.redhat.com/show_bug.cgi?id=1364001
redhat Patch Available
https://access.redhat.com/errata/RHSA-2017:2425
generic

CVE-2016-5423 - PSIRT.COM

http://www.securityfocus.com/bid/92433
generic

[SECURITY] [DSA 3646-1] postgresql-9.4 security update

http://www.debian.org/security/2016/dsa-3646
generic
http://rhn.redhat.com/errata/RHSA-2016-2606.html
generic
http://rhn.redhat.com/errata/RHSA-2016-1821.html
generic
http://rhn.redhat.com/errata/RHSA-2016-1820.html
generic
http://rhn.redhat.com/errata/RHSA-2016-1781.html

Patch Availability(6)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntupostgresql-server-dev-9.5 (9.5.4-0ubuntu0.16.04) @ xenial2026-05-22ubuntu
redhatspacewalk-web-0:2.3.2-35.el6sat2017-08-07redhat
redhatpostgresql-0:9.2.18-1.el72016-11-03redhat
redhatpostgresql92-postgresql-0:9.2.18-1.el72016-09-07redhat
redhatrh-postgresql95-postgresql-0:9.5.4-1.el72016-09-07redhat
redhatrh-postgresql94-postgresql-0:9.4.9-1.el72016-08-31redhat

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
postgresql-9.19.1.10-0wheezy1 ... 9.1.9-5 (29 versions)9.1.23-0+deb7u1—
Debian:8(1)
PackageVulnerable rangeFixed inDependents
postgresql-9.49.4.1-1 ... 9.4.8-0+deb8u1 (18 versions)9.4.9-0+deb8u1—

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 5× in last 7d / 16× 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 133 total refreshes for this CVE.

  1. 2026-09-19 15:35 UTCEPSS rescore
  2. 2026-09-18 19:22 UTCEPSS rescore
  3. 2026-09-17 19:21 UTCEPSS rescore
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  11. 2026-07-23 14:14 UTCEPSS rescore
  12. 2026-07-23 01:23 UTCEG score recompute
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  75. 2026-06-10 13:18 UTCEPSS rescore

Frequently asked(5)

What is CVE-2016-5423?
CVE-2016-5423 is a high vulnerability published on December 9, 2016. PostgreSQL before 9.1.23, 9.2.x before 9.2.18, 9.3.x before 9.3.14, 9.4.x before 9.4.9, and 9.5.x before 9.5.4 allow remote authenticated users to cause a denial of service (NULL pointer dereference and server crash), obtain sensitive memory information, or possibly execute arbitrary code via (1) a…
When was CVE-2016-5423 disclosed?
CVE-2016-5423 was first published in the National Vulnerability Database on December 9, 2016, 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-2016-5423 actively exploited?
CVE-2016-5423 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 6% probability of exploitation in the next 30 days, which ranks it in the top 7.0% of all scored CVEs.
What is the CVSS score of CVE-2016-5423?
CVE-2016-5423 has a CVSS v3 base score of 8.3 (NVD).
How do I remediate CVE-2016-5423?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2016-5423, 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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