Is CVE-2016-5423 in the CISA KEV catalog?

No. CVE-2016-5423 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2016-5423?

CVE-2016-5423 has a CVSS v3 base score of 8.3 (HIGH).

What is the EPSS score for CVE-2016-5423?

CVE-2016-5423 has an EPSS score of 5.96% (92th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2016-5423?

Upgrade postgresql-9.3 on ubuntu 14.04 to 9.3.14-0ubuntu0.14.04 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2016-5423

HIGHEPSS 92th pctl

8.3

CVSS v3

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.

CWE-476NULL Pointer Dereference

How to fix

Remediation Available

postgresql-9.3Ubuntu

Fixed in:9.3.14-0ubuntu0.14.04USN-3066-1

postgresql-9.5Ubuntu

Fixed in:9.5.4-0ubuntu0.16.04USN-3066-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

5.96%probability of exploitation in 30 days

92ndpercentile

High risk: more likely to be exploited than 92% of all known CVEs.

References

Patch1

postgresql.org

Vendor Advisory5

Third-Party Advisory4

Other references6

Related Vulnerabilities

Other CWE-476 (NULL Pointer Dereference) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-21758	High	7.5	92%	-	Fix
CVE-2023-21547	High	7.5	88%	-	Fix
CVE-2014-3470	Medium	4.3	86%	-	Fix
CVE-2021-44224	High	8.2	82%	-	Fix
CVE-2016-0742	High	7.5	82%	-	Fix
CVE-2009-1386	Medium	5.0	80%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-06.