high 7.5

CVE-2016-2776 in the critical feed json

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 construct responses…

published 2016-09-28 10 y ago modified 2026-06-17 4 mo ago also EUVD-2016-3850

cvss: 7.5; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 89.5%; EPSS 89.5% chance of exploitation in 30 days, percentile 99.7%
public exploits: 2; Metasploit, Exploit-DB

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 construct responses, which allows remote attackers to cause a denial of service (assertion failure and daemon exit) via a crafted query.

Patch / fix

distros 7

debian ubuntu red hat suse opensuse alpine arch linux

bind9 Debian 14, Debian 13, Debian 12 1:9.10.3.dfsg.P4-11

debian advisories DEBIAN-CVE-2016-2776

bind9 Ubuntu 14.04 LTS 1:9.9.5.dfsg-3ubuntu0.9
bind9 Ubuntu 16.04 LTS 1:9.10.3.dfsg.P4-8ubuntu1.1

ubuntu advisories UBUNTU-CVE-2016-2776

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

bind97 RHEL 5 32:9.7.0-21.P2.el5_11.7
bind97-libs RHEL 5 32:9.7.0-21.P2.el5_11.7
bind97-utils RHEL 5 32:9.7.0-21.P2.el5_11.7
bind97-chroot RHEL 5 32:9.7.0-21.P2.el5_11.7
bind RHEL 5 30:9.3.6-25.P1.el5_11.9
bind RHEL 6 32:9.8.2-0.47.rc1.el6_8.1
bind RHEL 7 32:9.9.4-29.el7_2.4
bind-sdb RHEL 5 30:9.3.6-25.P1.el5_11.9

red hat advisories RHSA-2016:2099 RHSA-2016:1945 RHSA-2016:1944

bind SLES for SAP 11 SP4, SLES 11 SP4, SLES 11 SP3-TERADATA +7 more 9.9.6P1-0.30.1
bind SLES for SAP 12 SP1, SLES 12 SP1, SLED 12 SP1 +1 more 9.9.9P1-46.1
bind SLES for SAP 12, SLES 12-LTSS 9.9.9P1-28.20.1

suse advisories SUSE-SU-2016:2405-1 SUSE-SU-2016:2401-1 SUSE-SU-2016:2399-1

bind openSUSE Tumbleweed 9.10.3P4-21.1

opensuse advisories openSUSE-SU-2024:10467-1

bind Alpine 3.2 9.10.4_p3
bind Alpine 3.3 9.10.4_p3-r0

alpine advisories ALPINE-CVE-2016-2776

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

bind Arch Linux 9.10.4.P3-1

arch linux advisories AVG-36

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2016-2776 updated 2026-11-04 cvss 7.5

bind: assertion failure in buffer.c while building responses to a specifically constructed request

Red Hat Enterprise Linux 4 bind
affected: no fix planned “Will not fix”
Red Hat Enterprise Linux (v. 5 server) bind 9.3.6-25.P1.el5_11.9, bind97 9.7.0-21.P2.el5_11.7, bind-sdb 9.3.6-25.P1.el5_11.9, bind-libs 9.3.6-25.P1.el5_11.9, bind-utils 9.3.6-25.P1.el5_11.9, bind-chroot 9.3.6-25.P1.el5_11.9, +4 more Red Hat Enterprise Linux Client (v. 7) bind 9.9.4-29.el7_2.4, bind-libs 9.9.4-29.el7_2.4, bind-utils 9.9.4-29.el7_2.4, bind-license 9.9.4-29.el7_2.4, bind-libs-lite 9.9.4-29.el7_2.4 Red Hat Enterprise Linux Client Optional (v. 7) bind 9.9.4-29.el7_2.4, bind-sdb 9.9.4-29.el7_2.4, bind-chroot 9.9.4-29.el7_2.4, bind-pkcs11 9.9.4-29.el7_2.4, bind-sdb-chroot 9.9.4-29.el7_2.4, bind-pkcs11-libs 9.9.4-29.el7_2.4, +1 more Red Hat Enterprise Linux ComputeNode (v. 7) bind 9.9.4-29.el7_2.4, bind-libs 9.9.4-29.el7_2.4, bind-utils 9.9.4-29.el7_2.4, bind-license 9.9.4-29.el7_2.4, bind-libs-lite 9.9.4-29.el7_2.4 Red Hat Enterprise Linux ComputeNode Optional (v. 7) bind 9.9.4-29.el7_2.4, bind-sdb 9.9.4-29.el7_2.4, bind-chroot 9.9.4-29.el7_2.4, bind-pkcs11 9.9.4-29.el7_2.4, bind-sdb-chroot 9.9.4-29.el7_2.4, bind-pkcs11-libs 9.9.4-29.el7_2.4, +1 more Red Hat Enterprise Linux Desktop (v. 5 client) bind 9.3.6-25.P1.el5_11.9, bind-sdb 9.3.6-25.P1.el5_11.9, bind-libs 9.3.6-25.P1.el5_11.9, bind-utils 9.3.6-25.P1.el5_11.9

+4 more productsfewer

Red Hat Enterprise Linux Desktop (v. 6) bind 9.8.2-0.47.rc1.el6_8.1, bind-libs 9.8.2-0.47.rc1.el6_8.1, bind-utils 9.8.2-0.47.rc1.el6_8.1 Red Hat Enterprise Linux Desktop Optional (v. 6) bind 9.8.2-0.47.rc1.el6_8.1, bind-sdb 9.8.2-0.47.rc1.el6_8.1, bind-chroot 9.8.2-0.47.rc1.el6_8.1 Red Hat Enterprise Linux Desktop Workstation (v. 5 client) bind 9.3.6-25.P1.el5_11.9, bind97 9.7.0-21.P2.el5_11.7, bind-chroot 9.3.6-25.P1.el5_11.9, bind97-libs 9.7.0-21.P2.el5_11.7, bind97-utils 9.7.0-21.P2.el5_11.7, bind97-chroot 9.7.0-21.P2.el5_11.7, +1 more Red Hat Enterprise Linux HPC Node (v. 6) bind 9.8.2-0.47.rc1.el6_8.1, bind-libs 9.8.2-0.47.rc1.el6_8.1, bind-utils 9.8.2-0.47.rc1.el6_8.1

fixed: vendor fix RHSA-2016:1944
Red Hat Enterprise Linux HPC Node EUS (v. 6.6) bind 9.8.2-0.30.rc1.el6_6.6, bind-libs 9.8.2-0.30.rc1.el6_6.6, bind-utils 9.8.2-0.30.rc1.el6_6.6 Red Hat Enterprise Linux HPC Node EUS (v. 6.7) bind 9.8.2-0.37.rc1.el6_7.8, bind-libs 9.8.2-0.37.rc1.el6_7.8, bind-utils 9.8.2-0.37.rc1.el6_7.8
fixed: vendor fix RHSA-2016:2099
Red Hat Enterprise Linux HPC Node Optional (v. 6) bind 9.8.2-0.47.rc1.el6_8.1, bind-sdb 9.8.2-0.47.rc1.el6_8.1, bind-chroot 9.8.2-0.47.rc1.el6_8.1
fixed: vendor fix RHSA-2016:1944
Red Hat Enterprise Linux HPC Node Optional EUS (v. 6.6) bind 9.8.2-0.30.rc1.el6_6.6, bind-sdb 9.8.2-0.30.rc1.el6_6.6, bind-chroot 9.8.2-0.30.rc1.el6_6.6 Red Hat Enterprise Linux HPC Node Optional EUS (v. 6.7) bind 9.8.2-0.37.rc1.el6_7.8, bind-sdb 9.8.2-0.37.rc1.el6_7.8, bind-chroot 9.8.2-0.37.rc1.el6_7.8
fixed: vendor fix RHSA-2016:2099
Red Hat Enterprise Linux Server (v. 6) bind 9.8.2-0.47.rc1.el6_8.1, bind-libs 9.8.2-0.47.rc1.el6_8.1, bind-utils 9.8.2-0.47.rc1.el6_8.1, bind-chroot 9.8.2-0.47.rc1.el6_8.1 Red Hat Enterprise Linux Server (v. 7) bind 9.9.4-29.el7_2.4, bind-libs 9.9.4-29.el7_2.4, bind-utils 9.9.4-29.el7_2.4, bind-chroot 9.9.4-29.el7_2.4, bind-pkcs11 9.9.4-29.el7_2.4, bind-license 9.9.4-29.el7_2.4, +3 more
fixed: vendor fix RHSA-2016:1944
Red Hat Enterprise Linux Server AUS (v. 6.2) bind 9.7.3-8.P3.el6_2.5, bind-libs 9.7.3-8.P3.el6_2.5, bind-utils 9.7.3-8.P3.el6_2.5, bind-chroot 9.7.3-8.P3.el6_2.5 Red Hat Enterprise Linux Server AUS (v. 6.4) bind 9.8.2-0.17.rc1.el6_4.9, bind-libs 9.8.2-0.17.rc1.el6_4.9, bind-utils 9.8.2-0.17.rc1.el6_4.9, bind-chroot 9.8.2-0.17.rc1.el6_4.9 Red Hat Enterprise Linux Server AUS (v. 6.5) bind 9.8.2-0.23.rc1.el6_5.4, bind-libs 9.8.2-0.23.rc1.el6_5.4, bind-utils 9.8.2-0.23.rc1.el6_5.4, bind-chroot 9.8.2-0.23.rc1.el6_5.4 Red Hat Enterprise Linux Server EUS (v. 6.6) bind 9.8.2-0.30.rc1.el6_6.6, bind-libs 9.8.2-0.30.rc1.el6_6.6, bind-utils 9.8.2-0.30.rc1.el6_6.6, bind-chroot 9.8.2-0.30.rc1.el6_6.6 Red Hat Enterprise Linux Server EUS (v. 6.7) bind 9.8.2-0.37.rc1.el6_7.8, bind-libs 9.8.2-0.37.rc1.el6_7.8, bind-utils 9.8.2-0.37.rc1.el6_7.8, bind-chroot 9.8.2-0.37.rc1.el6_7.8
fixed: vendor fix RHSA-2016:2099
Red Hat Enterprise Linux Server Optional (v. 6) bind-sdb 9.8.2-0.47.rc1.el6_8.1 Red Hat Enterprise Linux Server Optional (v. 7) bind-sdb 9.9.4-29.el7_2.4, bind-pkcs11 9.9.4-29.el7_2.4, bind-sdb-chroot 9.9.4-29.el7_2.4, bind-pkcs11-libs 9.9.4-29.el7_2.4, bind-pkcs11-utils 9.9.4-29.el7_2.4
fixed: vendor fix RHSA-2016:1944

show 2 more

Red Hat Enterprise Linux Server Optional AUS (v. 6.2) bind 9.7.3-8.P3.el6_2.5, bind-sdb 9.7.3-8.P3.el6_2.5 Red Hat Enterprise Linux Server Optional AUS (v. 6.4) bind 9.8.2-0.17.rc1.el6_4.9, bind-sdb 9.8.2-0.17.rc1.el6_4.9 Red Hat Enterprise Linux Server Optional AUS (v. 6.5) bind 9.8.2-0.23.rc1.el6_5.4, bind-sdb 9.8.2-0.23.rc1.el6_5.4 Red Hat Enterprise Linux Server Optional EUS (v. 6.6) bind-sdb 9.8.2-0.30.rc1.el6_6.6 Red Hat Enterprise Linux Server Optional EUS (v. 6.7) bind-sdb 9.8.2-0.37.rc1.el6_7.8 Red Hat Enterprise Linux Server Optional TUS (v. 6.5) bind 9.8.2-0.23.rc1.el6_5.4, bind-sdb 9.8.2-0.23.rc1.el6_5.4

+1 more productsfewer

Red Hat Enterprise Linux Server TUS (v. 6.5) bind 9.8.2-0.23.rc1.el6_5.4, bind-libs 9.8.2-0.23.rc1.el6_5.4, bind-utils 9.8.2-0.23.rc1.el6_5.4, bind-chroot 9.8.2-0.23.rc1.el6_5.4

fixed: vendor fix RHSA-2016:2099
Red Hat Enterprise Linux Workstation (v. 6) bind 9.8.2-0.47.rc1.el6_8.1, bind-libs 9.8.2-0.47.rc1.el6_8.1, bind-utils 9.8.2-0.47.rc1.el6_8.1, bind-chroot 9.8.2-0.47.rc1.el6_8.1 Red Hat Enterprise Linux Workstation (v. 7) bind 9.9.4-29.el7_2.4, bind-libs 9.9.4-29.el7_2.4, bind-utils 9.9.4-29.el7_2.4, bind-chroot 9.9.4-29.el7_2.4, bind-pkcs11 9.9.4-29.el7_2.4, bind-license 9.9.4-29.el7_2.4, +3 more Red Hat Enterprise Linux Workstation Optional (v. 6) bind-sdb 9.8.2-0.47.rc1.el6_8.1 Red Hat Enterprise Linux Workstation Optional (v. 7) bind-sdb 9.9.4-29.el7_2.4, bind-sdb-chroot 9.9.4-29.el7_2.4
fixed: vendor fix RHSA-2016:1944

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Timeline

2016-09-27 First public exploit (Metasploit auxiliary/dos/dns/bind_tsig)
2016-09-28 Published

Exploit prediction

89.48% chance of exploitation in the next 30 days, higher than 99.7% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

Metasploit auxiliary/dos/dns/bind_tsig BIND TSIG Query Denial of Service metasploit auxiliary, normal rank, 2016-09-27
EDB-40453 ISC BIND 9 - Denial of Service dos, 2016-10-04

CVSS scores

assigned by	version	score	vector
NVD	3.0	7.5	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD	2.0	7.8	AV:N/AC:L/Au:N/C:N/I:N/A:C

Classification

Weakness

CWE-20 Improper Input Validation

References

exploit-db.com /exploits/40453/
exploit
rhn.redhat.com /errata/RHSA-2016-1944.html
vendor-advisory
security.gentoo.org /glsa/201610-07
vendor-advisory
rhn.redhat.com /errata/RHSA-2016-2099.html
vendor-advisory
security.freebsd.org /advisories/FreeBSD-SA-16:28.bind.asc
vendor-advisory
rhn.redhat.com /errata/RHSA-2016-1945.html
vendor-advisory
kb.isc.org /article/AA-01419/0
vendor-advisory
securityfocus.com /bid/93188
vdb-entry
kb.isc.org /article/AA-01438
oracle.com /technetwork/topics/security/linuxbulletinoct2016-3090545.html
third-party-advisory
kb.isc.org /article/AA-01435
security.netapp.com /advisory/ntap-20160930-0001/
oracle.com /technetwork/topics/security/bulletinoct2016-3090566.html
third-party-advisory
securitytracker.com /id/1036903
vdb-entry
oracle.com /technetwork/topics/security/ovmbulletinoct2016-3090547.html
third-party-advisory
kb.isc.org /article/AA-01436
h20566.www2.hpe.com /portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05321107
third-party-advisory

Sources

CVE List CVE-2016-2776
NVD CVE-2016-2776

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary