Is CVE-2016-5427 in the CISA KEV catalog?

No. CVE-2016-5427 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2016-5427?

CVE-2016-5427 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2016-5427?

CVE-2016-5427 has an EPSS score of 62.98% (99th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2016-5427?

Upgrade pdns on debian 11 to 4.0.0~alpha1-1 or later.

CVE & CISA-KEV Catalog

CVE-2016-5427

HIGHEPSS 99th pctl

7.5

CVSS v3

NVD

Description

PowerDNS (aka pdns) Authoritative Server before 3.4.10 does not properly handle a . (dot) inside labels, which allows remote attackers to cause a denial of service (backend CPU consumption) via a crafted DNS query.

CWE-399Resource Management Errors

How to fix

Remediation Available

pdnsDebian

Fixed in:4.0.0~alpha1-1CVE-2016-5427

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

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 RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

62.98%probability of exploitation in 30 days

99thpercentile

Very high risk: more likely to be exploited than 99% of all known CVEs.

References

Vendor Advisory1

doc.powerdns.com

Release Notes1

openwall.com

Other references4

Related Vulnerabilities

Other CWE-399 (Resource Management Errors) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2009-3103	High	10.0	90%	-	-
CVE-2009-0075	High	9.3	85%	-	-
CVE-2005-1790	Low	2.6	83%	-	-
CVE-2010-0806	High	8.8	82%	KEV	-
CVE-2009-2526	High	7.8	82%	-	-
CVE-2015-1868	High	7.8	82%	-	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.