CVE-2016-2776

Exp

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.

Published: 2016-09-28 Last update: 2026-05-06 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2016-2776 is rated High Exploit Risk (78.9/100): CVSS High severity, with high exploitation likelihood (EPSS 87.45%, 99th percentile). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2016-2776

EDB-ID Source Kind Published Link
40453 exploit_db edb 2016-10-04 Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2016-2776

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-05-24 88.39% 87.45% -0.94%
2 2026-05-02 86.96% 88.39% +1.43%
3 2026-03-04 — 86.96% —

Full EPSS history (58 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2016-2776

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.0 HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
7.8 2.0 HIGH
AV:N/AC:L/Au:N/C:N/I:N/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:C)
Complete availability impact.
 10.0 6.9 [email protected]

Weakness enumeration for CVE-2016-2776

OS Trackers for CVE-2016-2776

vendor priority summary link
debian not yet assigned CVE-2016-2776 not yet assigned priority: Debian including 1 source packages (bind9), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2016-2776
gentoo normal CVE-2016-2776: 1 GLSA(s) (201610-07), 1 atom(s) (net-dns/bind); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2016-2776
redhat high — https://access.redhat.com/security/cve/CVE-2016-2776
suse high CVE-2016-2776 severity important: SUSE including 476 source package names (amazon/suse-sles-15-sp1-chost-byos-v20210304-hvm-ssd-x86_64, amazon/suse-sles-15-sp1-chost-byos-v20220127-hvm-ssd-x86_64, …), 684 product×package rows across 59 product lines (SUSE Liberty Linux 7, SUSE Linux Enterprise Desktop 12 SP1, … (59 product lines)): Fixed 429, Known Affected 157, Known Not Affected 98. https://www.suse.com/security/cve/CVE-2016-2776/
ubuntu medium CVE-2016-2776 medium priority: Ubuntu including 1 source packages (bind9), 6 status rows across 6 suites (precise, trusty, upstream, xenial, yakkety, zesty): released 6. https://ubuntu.com/security/CVE-2016-2776

Affected software / configurations for CVE-2016-2776

Vendor Product Version Raw CPE
oracle linux 5.0 cpe:2.3:o:oracle:linux:5.0:*:*:*:*:*:*:*
oracle linux 6 cpe:2.3:o:oracle:linux:6:*:*:*:*:*:*:*
oracle linux 7 cpe:2.3:o:oracle:linux:7:*:*:*:*:*:*:*
oracle vm_server 3.2 cpe:2.3:o:oracle:vm_server:3.2:*:*:*:*:*:*:*
oracle vm_server 3.3 cpe:2.3:o:oracle:vm_server:3.3:*:*:*:*:*:*:*
oracle vm_server 3.4 cpe:2.3:o:oracle:vm_server:3.4:*:*:*:*:*:*:*
isc bind <= 9.9.9 cpe:2.3:a:isc:bind:*:p3:*:*:*:*:*:*
isc bind 9.10.0 cpe:2.3:a:isc:bind:9.10.0:*:*:*:*:*:*:*
isc bind 9.10.0 cpe:2.3:a:isc:bind:9.10.0:a1:*:*:*:*:*:*
isc bind 9.10.0 cpe:2.3:a:isc:bind:9.10.0:a2:*:*:*:*:*:*
isc bind 9.10.0 cpe:2.3:a:isc:bind:9.10.0:b1:*:*:*:*:*:*
isc bind 9.10.0 cpe:2.3:a:isc:bind:9.10.0:b2:*:*:*:*:*:*
isc bind 9.10.0 cpe:2.3:a:isc:bind:9.10.0:p1:*:*:*:*:*:*
isc bind 9.10.0 cpe:2.3:a:isc:bind:9.10.0:p2:*:*:*:*:*:*
isc bind 9.10.0 cpe:2.3:a:isc:bind:9.10.0:rc1:*:*:*:*:*:*
isc bind 9.10.0 cpe:2.3:a:isc:bind:9.10.0:rc2:*:*:*:*:*:*
isc bind 9.10.1 cpe:2.3:a:isc:bind:9.10.1:*:*:*:*:*:*:*
isc bind 9.10.1 cpe:2.3:a:isc:bind:9.10.1:b1:*:*:*:*:*:*
isc bind 9.10.1 cpe:2.3:a:isc:bind:9.10.1:b2:*:*:*:*:*:*
isc bind 9.10.1 cpe:2.3:a:isc:bind:9.10.1:p1:*:*:*:*:*:*
isc bind 9.10.1 cpe:2.3:a:isc:bind:9.10.1:p2:*:*:*:*:*:*
isc bind 9.10.1 cpe:2.3:a:isc:bind:9.10.1:rc1:*:*:*:*:*:*
isc bind 9.10.1 cpe:2.3:a:isc:bind:9.10.1:rc2:*:*:*:*:*:*
isc bind 9.10.2 cpe:2.3:a:isc:bind:9.10.2:b1:*:*:*:*:*:*
isc bind 9.10.2 cpe:2.3:a:isc:bind:9.10.2:p1:*:*:*:*:*:*
isc bind 9.10.2 cpe:2.3:a:isc:bind:9.10.2:p2:*:*:*:*:*:*
isc bind 9.10.2 cpe:2.3:a:isc:bind:9.10.2:p3:*:*:*:*:*:*
isc bind 9.10.2 cpe:2.3:a:isc:bind:9.10.2:p4:*:*:*:*:*:*
isc bind 9.10.2 cpe:2.3:a:isc:bind:9.10.2:rc1:*:*:*:*:*:*
isc bind 9.10.2 cpe:2.3:a:isc:bind:9.10.2:rc2:*:*:*:*:*:*
isc bind 9.10.3 cpe:2.3:a:isc:bind:9.10.3:*:*:*:*:*:*:*
isc bind 9.10.3 cpe:2.3:a:isc:bind:9.10.3:b1:*:*:*:*:*:*
isc bind 9.10.3 cpe:2.3:a:isc:bind:9.10.3:p1:*:*:*:*:*:*
isc bind 9.10.3 cpe:2.3:a:isc:bind:9.10.3:p2:*:*:*:*:*:*
isc bind 9.10.3 cpe:2.3:a:isc:bind:9.10.3:p3:*:*:*:*:*:*
isc bind 9.10.3 cpe:2.3:a:isc:bind:9.10.3:p4:*:*:*:*:*:*
isc bind 9.10.3 cpe:2.3:a:isc:bind:9.10.3:rc1:*:*:*:*:*:*
isc bind 9.10.4 cpe:2.3:a:isc:bind:9.10.4:p2:*:*:*:*:*:*
isc bind 9.10.4 cpe:2.3:a:isc:bind:9.10.4:p3:*:*:*:*:*:*
isc bind 9.11.0 cpe:2.3:a:isc:bind:9.11.0:a1:*:*:*:*:*:*
isc bind 9.11.0 cpe:2.3:a:isc:bind:9.11.0:a2:*:*:*:*:*:*
isc bind 9.11.0 cpe:2.3:a:isc:bind:9.11.0:a3:*:*:*:*:*:*
isc bind 9.11.0 cpe:2.3:a:isc:bind:9.11.0:b1:*:*:*:*:*:*
isc bind 9.11.0 cpe:2.3:a:isc:bind:9.11.0:b2:*:*:*:*:*:*
isc bind 9.11.0 cpe:2.3:a:isc:bind:9.11.0:b3:*:*:*:*:*:*
isc bind 9.11.0 cpe:2.3:a:isc:bind:9.11.0:rc1:*:*:*:*:*:*
hp hp-ux 11.31 cpe:2.3:o:hp:hp-ux:11.31:*:*:*:*:*:*:*
oracle solaris 10.0 cpe:2.3:o:oracle:solaris:10.0:*:*:*:*:*:*:*
oracle solaris 11.3 cpe:2.3:o:oracle:solaris:11.3:*:*:*:*:*:*:*

References for CVE-2016-2776

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