No exploitation reportedFix available

CVE-2016-6170

No exploitation reported by the sources we read.

Published2016-07-06
WeaknessCWE-20

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

ISC BIND through 9.9.9-P1, 9.10.x through 9.10.4-P1, and 9.11.x through 9.11.0b1 allows primary DNS servers to cause a denial of service (secondary DNS server crash) via a large AXFR response, and possibly allows IXFR servers to cause a denial of service (IXFR client crash) via a large IXFR response and allows remote authenticated users to cause a denial of service (primary DNS server crash) via a large UPDATE message.

Timeline

dates in UTC

2016-07-0614:59CVE publishedNVD
2026-10-2319:23EPSS crossed 10 %FIRST EPSS

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2016-6170?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2016-6170?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Isc bind

Branch	Affected	Fixed in	Source
9.x	≥ 9.0, ≤ 9.9.8	no fix published	NVD
9.10	≥ 9.10.0, ≤ 9.10.3	no fix published	NVD
9.9	= 9.9.9	no fix published	NVD
9.10	= 9.10.4	no fix published	NVD
9.11	= 9.11.0	no fix published	NVD

Redhat enterprise linux

Branch	Affected	Fixed in	Source
5.0	= 5.0	no fix published	NVD
6.0	= 6.0	no fix published	NVD
7.0	= 7.0	no fix published	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Advisories and patches

bugzilla.redhat.comPatch
github.comPatch
kb.isc.orgVendor Advisory
kb.isc.orgVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.16.5read 2026-10-23
NVDCVSS 2.04read 2026-10-23
NVDweakness (CWE)CWE-20read 2026-10-23
FIRST EPSSEPSS score40.9 %read 2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Published: 2016-07-06
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2016-6170?

Is CVE-2016-6170 actively exploited?

Active exploitation of CVE-2016-6170 has not been confirmed. Its EPSS score was 40.9% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2016-6170?

CVE-2016-6170 has a CVSS v3 base score of 6.5 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

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