How severe is CVE-2016-6170?

CVE-2016-6170 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2016-6170 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 41% (98th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-6170?

CVE-2016-6170 primarily affects Redhat Enterprise Linux. In total, 14 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2016-6170?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2016-6170 published?

CVE-2016-6170 was published on 2016-07-06 and last updated on 2026-06-17.

CVE-2016-6170

CVE-2016-6170 is a medium-severity vulnerability in Redhat Enterprise Linux with a CVSS 3.x base score of 6.5. Its EPSS exploit-prediction score of 41% places it in the 98th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-20.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 4.0
EPSS exploit prediction: 41% (98th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Redhat Enterprise Linux
Published: 2016-07-06
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2016-6170?: 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.
How severe is CVE-2016-6170?: CVE-2016-6170 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2016-6170 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 41% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-6170?: CVE-2016-6170 primarily affects Redhat Enterprise Linux. In total, 14 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2016-6170?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2016-6170 published?: CVE-2016-6170 was published on 2016-07-06 and last updated on 2026-06-17.

References

Affected products (14)

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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