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Bind CVE-2016-6170

MEDIUM
Improper Input Validation (CWE-20)
2016-07-06 secalert@redhat.com
Denial Of Service Red Hat Enterprise Linux Bind Isc
6.5
CVSS 3.1 · NVD
View

Vulnerability Assessment

Weakness
CWE
CWE-20
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V2 - Validation and Business Logic Input validation, allowlisting
Impact

CVSS score of 6.5 (MEDIUM). Attack characteristics: network attack vector, low complexity, low privileges required, no user interaction not required. Public proof-of-concept exploit code is available. EPSS exploitation probability: 13.02%.
Exploit ScenarioDerived

This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the medium-severity affected system.
This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
Patch available 13.0% exploitation probability (EPSS)

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AnalysisAI

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. Rated medium severity (CVSS 6.5), this vulnerability is remotely exploitable, low attack complexity. Public exploit code available and EPSS exploitation probability 13.0%.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

Affects your stack

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Technical ContextAI · show details

This vulnerability is classified under CWE-20. 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. Affected products include: Isc Bind, Redhat Enterprise Linux. Version information: through 9.9.9.

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  • Exploit and PoC references, threat intelligence from 22 sources
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Severity by source

NVD PRIMARY 6.5 MEDIUM
AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

DescriptionCVE.org

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.

Threat Intelligence Overview

EPSS Score
13.0%
Top 6% exploitable
Exploit
POC
Public exploit code exists
Data Quality
4 sources
Confidence: Medium
NVD CVE.org EPSS GitHub

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC Yes
EPSS 13.0%
Patch available Yes
Active threat Yes
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
Poc
System Exposure· derived
Open
Automatable· derived
No
Human Impact· derived
Medium

Priority Score

65
Low Medium High Critical
KEV: 0
EPSS: +13
CVSS: +32
PoC: +20
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Denial of Service MEDIUM

Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.

Affected Products (CPE)CVE.org

cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*
cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*
cpe:2.3:a:isc:bind:9.9.9:-:*:*:*:*:*:*
cpe:2.3:a:isc:bind:9.9.9:beta1:*:*:*:*:*:*
cpe:2.3:a:isc:bind:9.9.9:beta2:*:*:*:*:*:*
cpe:2.3:a:isc:bind:9.9.9:p1:*:*:*:*:*:*
cpe:2.3:a:isc:bind:9.10.4:-:*:*:*:*:*:*
cpe:2.3:a:isc:bind:9.10.4:p1:*:*:*:*:*:*
cpe:2.3:a:isc:bind:9.11.0:a1:*:*:*:*:*:*
cpe:2.3:a:isc:bind:9.11.0:a2:*:*:*:*:*:*
cpe:2.3:a:isc:bind:9.11.0:a3:*:*:*:*:*:*
cpe:2.3:a:isc:bind:9.11.0:b1:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:5.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*

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7.5 Sep 28

buffer.c in named in ISC BIND 9 before 9.9.9-P3, 9.10.x before 9.10.4-P3, and 9.11.x before 9.11.0rc3 does not properly

CVE-2016-9131 HIGH
7.5 Jan 12

named in ISC BIND 9.x before 9.9.9-P5, 9.10.x before 9.10.4-P5, and 9.11.x before 9.11.0-P2 allows remote attackers to c
CVE-2013-4854 HIGH POC
7.8 Jul 29

The RFC 5011 implementation in rdata.c in ISC BIND 9.7.x and 9.8.x before 9.8.5-P2, 9.8.6b1, 9.9.x before 9.9.3-P2, and

CVE-2015-5722 HIGH
7.8 Sep 05

buffer.c in named in ISC BIND 9.x before 9.9.7-P3 and 9.10.x before 9.10.2-P4 allows remote attackers to cause a denial

CVE-2016-1285 MEDIUM
6.8 Mar 09

named in ISC BIND 9.x before 9.9.8-P4 and 9.10.x before 9.10.3-P4 does not properly handle DNAME records when parsing fe
CVE-2012-4244 HIGH
7.8 Sep 14

ISC BIND 9.x before 9.7.6-P3, 9.8.x before 9.8.3-P3, 9.9.x before 9.9.1-P3, and 9.4-ESV and 9.6-ESV before 9.6-ESV-R7-P3
CVE-2016-1286 HIGH
8.6 Mar 09

named in ISC BIND 9.x before 9.9.8-P4 and 9.10.x before 9.10.3-P4 allows remote attackers to cause a denial of service (
CVE-2012-1667 HIGH
8.5 Jun 05

ISC BIND 9.x before 9.7.6-P1, 9.8.x before 9.8.3-P1, 9.9.x before 9.9.1-P1, and 9.4-ESV and 9.6-ESV before 9.6-ESV-R7-P1
CVE-2016-9147 HIGH
7.5 Jan 12

named in ISC BIND 9.9.9-P4, 9.9.9-S6, 9.10.4-P4, and 9.11.0-P1 allows remote attackers to cause a denial of service (ass
CVE-2015-8000 MEDIUM
5.0 Dec 16

db.c in named in ISC BIND 9.x before 9.9.8-P2 and 9.10.x before 9.10.3-P2 allows remote attackers to cause a denial of s
CVE-2016-2848 HIGH
7.5 Oct 21

ISC BIND 9.1.0 through 9.8.4-P2 and 9.9.0 through 9.9.2-P2 allows remote attackers to cause a denial of service (asserti

Same weakness CWE-20 – Improper Input Validation

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CVE-2023-22515 CRITICAL POC
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CVE-2009-0927 HIGH POC
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CVE-2017-9791 CRITICAL POC
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CVE-2017-15944 CRITICAL POC
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CVE-2019-0604 CRITICAL POC
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Same technique Denial Of Service

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CVE-2011-0611 HIGH POC
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CVE-2012-0507 CRITICAL POC
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CVE-2014-1761 HIGH POC
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CVE-2015-5122 CRITICAL POC
9.8
CVE-2011-0609 HIGH POC
7.8

References

Advisories & patches
PATCH https://bugzilla.redhat.com/show_bug.cgi?id=1353563 ADVISORY https://kb.isc.org/article/AA-01390 ADVISORY https://kb.isc.org/article/AA-01390/169/CVE-2016-6170 REF http://www.openwall.com/lists/oss-security/2016/07/06/3 REF http://www.securityfocus.com/bid/91611 REF http://www.securitytracker.com/id/1036241 REF https://lists.dns-oarc.net/pipermail/dns-operations/2016-July/015058.html REF https://lists.dns-oarc.net/pipermail/dns-operations/2016-July/015073.html REF https://lists.dns-oarc.net/pipermail/dns-operations/2016-July/015075.html REF https://security.gentoo.org/glsa/201610-07

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