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Vulnerability record · CVE-2016-5423 · published 9 December 2016

CVE-2016-5423: Debian linux null pointer dereference vulnerability

Debian · Debian Linux

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.

8.3 CVSS 3.0 High EPSS 6.0% · top 7.0% CWE-476 · NULL pointer dereference
8.3CVSS 3.0 base score, v2 6.5
6.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
32References
17 Jun 2026Last modified by NVD

Description

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:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://rhn.redhat.com/errata/RHSA-2016-1781.html
http://rhn.redhat.com/errata/RHSA-2016-1820.html
http://rhn.redhat.com/errata/RHSA-2016-1821.html
http://rhn.redhat.com/errata/RHSA-2016-2606.html
http://www.debian.org/security/2016/dsa-3646 Third Party Advisory
http://www.securityfocus.com/bid/92433 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1036617 Third Party AdvisoryVDB Entry
https://access.redhat.com/errata/RHSA-2017:2425
https://bugzilla.redhat.com/show_bug.cgi?id=1364001 Issue TrackingThird Party AdvisoryVDB Entry
https://security.gentoo.org/glsa/201701-33
https://www.postgresql.org/about/news/1688/ PatchVendor Advisory
https://www.postgresql.org/docs/current/static/release-9-1-23.html Release NotesVendor Advisory
https://www.postgresql.org/docs/current/static/release-9-2-18.html Release NotesVendor Advisory
https://www.postgresql.org/docs/current/static/release-9-3-14.html Release NotesVendor Advisory
https://www.postgresql.org/docs/current/static/release-9-4-9.html Release NotesVendor Advisory
https://www.postgresql.org/docs/current/static/release-9-5-4.html Release NotesVendor Advisory
http://rhn.redhat.com/errata/RHSA-2016-1781.html
http://rhn.redhat.com/errata/RHSA-2016-1820.html
http://rhn.redhat.com/errata/RHSA-2016-1821.html
http://rhn.redhat.com/errata/RHSA-2016-2606.html
http://www.debian.org/security/2016/dsa-3646 Third Party Advisory
http://www.securityfocus.com/bid/92433 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1036617 Third Party AdvisoryVDB Entry
https://access.redhat.com/errata/RHSA-2017:2425
https://bugzilla.redhat.com/show_bug.cgi?id=1364001 Issue TrackingThird Party AdvisoryVDB Entry
https://security.gentoo.org/glsa/201701-33
https://www.postgresql.org/about/news/1688/ PatchVendor Advisory
https://www.postgresql.org/docs/current/static/release-9-1-23.html Release NotesVendor Advisory
https://www.postgresql.org/docs/current/static/release-9-2-18.html Release NotesVendor Advisory
https://www.postgresql.org/docs/current/static/release-9-3-14.html Release NotesVendor Advisory
https://www.postgresql.org/docs/current/static/release-9-4-9.html Release NotesVendor Advisory
https://www.postgresql.org/docs/current/static/release-9-5-4.html Release NotesVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2016-5423), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.