Is CVE-2016-6172 in the CISA KEV catalog?

No. CVE-2016-6172 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2016-6172?

CVE-2016-6172 has a CVSS v3 base score of 6.8 (MEDIUM).

What is the EPSS score for CVE-2016-6172?

CVE-2016-6172 has an EPSS score of 3.82% (89th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2016-6172?

Upgrade pdns on debian 11 to 4.0.1-1 or later.

CVE & CISA-KEV Catalog

CVE-2016-6172

MEDIUMEPSS 89th pctl

6.8

CVSS v3

NVD

Description

PowerDNS (aka pdns) Authoritative Server before 4.0.1 allows remote primary DNS servers to cause a denial of service (memory exhaustion and secondary DNS server crash) via a large (1) AXFR or (2) IXFR response.

CWE-400Resource Exhaustion

How to fix

Remediation Available

pdnsDebian

Fixed in:4.0.1-1CVE-2016-6172

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 ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeChanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

3.82%probability of exploitation in 30 days

89thpercentile

Elevated risk: more likely to be exploited than 89% of all known CVEs.

References

Patch1

github.com

Third-Party Advisory2

Issue Tracking3

Mailing List1

openwall.com

Release Notes1

doc.powerdns.com

Other references3

Related Vulnerabilities

Other CWE-400 (Resource Exhaustion) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-44487	High	7.5	100%	KEV	Fix
CVE-2021-44228	Critical	10.0	100%	KEV + Ransom	Fix
CVE-2011-3192	High	7.8	99%	-	Fix
CVE-2019-11478	Medium	5.3	95%	-	Fix
CVE-2024-25617	Medium	5.3	89%	-	Fix
CVE-2018-1000115	High	7.5	89%	-	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.