What is CVE-2016-9778?

CVE-2016-9778 is a high-severity vulnerability in Isc Bind, classified under CWE-388. CVSS score: 7.5/10. Published 2019-01-16.

How severe is CVE-2016-9778?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2016-9778 known to be exploited?

10 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Isc Bind

CVE-2016-9778

An error in handling certain queries can cause an assertion failure when a server is using the nxdomain-redirect feature to cover a zone for which it is also providing authoritative service. A vulnerable server could be intentionally stopped by an attacker if it was using a configuration that met the criteria for the vulnerability and if the attacker could cause it to accept a query that possessed the required attributes. Please note: This vulnerability affects the "nxdomain-redirect" feature, which is one of two methods of handling NXDOMAIN redirection, and is only available in certain versions of BIND. Redirection using zones of type "redirect" is not affected by this vulnerability. Affects BIND 9.9.8-S1 -> 9.9.8-S3, 9.9.9-S1 -> 9.9.9-S6, 9.11.0-9.11.0-P1.

Published 2019-01-16 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.068 (94.0th percentile), scored 2026-10-18.

Low probability of exploitation in the next 30 days, but still tracked. 94th percentile — 94.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.068 · newest: 0.068 · change: 0.000

Affected products

Isc Bind — versions 9.9.8, 9.9.9, 9.11.0
Isc Bind 9 — versions BIND 9 9.9.8-S1 -> 9.9.8-S3, 9.9.9-S1 -> 9.9.9-S6, 9.11.0-9.11.0-P1
NetApp Data Ontap Edge
NetApp Solidfire Element OS Management Node

Weakness classification (CWE)

CWE-388

Public proof-of-concept exploits

References

www.securitytracker.com/id/1037582 (VDB Entry, Third Party Advisory, vdb-entry)
security.gentoo.org/glsa/201708-01 (vendor-advisory, Third Party Advisory)
security.netapp.com/advisory/ntap-20180926-0005/ (Third Party Advisory)
kb.isc.org/article/AA-01442/ (Vendor Advisory)
www.securityfocus.com/bid/95388 (VDB Entry, Third Party Advisory, vdb-entry)

Frequently asked questions

What is CVE-2016-9778?: CVE-2016-9778 is a high-severity vulnerability in Isc Bind, classified under CWE-388. CVSS score: 7.5/10. Published 2019-01-16.
How severe is CVE-2016-9778?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2016-9778 known to be exploited?: 10 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.