CVE-2016-2776
HighExploitedPublic exploitbuffer.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 Sep 28, 2016 · Updated Aug 7, 2026 · Also known as ALPINE-CVE-2016-2776, DEBIAN-CVE-2016-2776, SUSE-SU-2016:2399-1, SUSE-SU-2016:2401-1, SUSE-SU-2016:2405-1, UBUNTU-CVE-2016-2776, USN-3088-1
Key Facts
Patch immediately- CVE-2016-2776 is a high-severity vulnerability (CVSS 7.5 v3.1) affecting Bind (Isc), Hp-Ux, Linux (Oracle) and 22 more products.
- It is exploited in the wild, listed in Industry KEV feed since Oct 5, 2016. Public exploit code is available.
- EPSS estimates a 89% probability of exploitation in the next 30 days.
- Fixed versions are available, including Bind 30:9.3.6-25.P1.el5_11.9, Bind 32:9.8.2-0.17.rc1.el6_4.9, Bind 32:9.8.2-0.37.rc1.48.amzn1.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
7.5
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS (30-day exploit likelihood)
89%
Higher than 99.7% of all scored CVEs
Exploited in the wild
Yes
1 catalog listing
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2016-2776 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| Industry KEV feed | Oct 5, 2016 | n/a | Not reported |
Required action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
Affected Products
259 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| BindIsc | 9.10.0, 9.10.0-a1, 9.10.0-a2, 9.10.0-b1, 9.10.0-b2, 9.10.0-p1, 9.10.0-p2, 9.10.0-rc1 | 9.9.9 |
| Hp-UxHp | 11.31 | n/a |
| LinuxOracle | 5.0, 6, 7 | n/a |
| SolarisOracle | 10.0, 11.3 | n/a |
| Vm ServerOracle | 3.2, 3.3, 3.4 | n/a |
Patched Releases
Bind
30:9.3.6-25.P1.el5_11.9, 32:9.8.2-0.17.rc1.el6_4.9, 32:9.8.2-0.37.rc1.48.amzn1, 32:9.8.2-0.47.rc1.el6_8.1, 32:9.9.4-29.el7_2.4, 9.10.3P4-21.1, 9.10.4_p3, 9.10.4_p3-r0, 9.10.4.P3-1, 9.9.6P1-0.30.1, 9.9.9P1-28.20.1, 9.9.9P1-39.1, 9.9.9P1-46.1, 9.9.9
bind-chroot
30:9.3.6-25.P1.el5_11.9, 32:9.8.2-0.37.rc1.48.amzn1, 32:9.8.2-0.47.rc1.el6_8.1, 32:9.9.4-29.el7_2.4
bind-chrootenv
9.10.3P4-21.1, 9.9.6P1-0.30.1, 9.9.9P1-28.20.1, 9.9.9P1-39.1, 9.9.9P1-46.1
bind-devel
30:9.3.6-25.P1.el5_11.9, 32:9.8.2-0.37.rc1.48.amzn1, 32:9.8.2-0.47.rc1.el6_8.1, 32:9.9.4-29.el7_2.4, 9.10.3P4-21.1, 9.9.6P1-0.30.1, 9.9.9P1-39.1, 9.9.9P1-46.1
bind-devel-32bit
9.10.3P4-21.1, 9.9.6P1-0.30.1
bind-doc
9.10.3P4-21.1, 9.9.6P1-0.30.1, 9.9.9P1-28.20.1, 9.9.9P1-39.1, 9.9.9P1-46.1
bind-libbind-devel
30:9.3.6-25.P1.el5_11.9
bind-libs
30:9.3.6-25.P1.el5_11.9, 32:9.8.2-0.37.rc1.48.amzn1, 32:9.8.2-0.47.rc1.el6_8.1, 32:9.9.4-29.el7_2.4, 9.9.6P1-0.30.1, 9.9.9P1-28.20.1, 9.9.9P1-39.1, 9.9.9P1-46.1
bind-libs-32bit
9.9.6P1-0.30.1, 9.9.9P1-28.20.1, 9.9.9P1-39.1, 9.9.9P1-46.1
bind-libs-lite
32:9.9.4-29.el7_2.4
bind-libs-x86
9.9.6P1-0.30.1
bind-license
32:9.9.4-29.el7_2.4
bind-lite-devel
32:9.9.4-29.el7_2.4
bind-lwresd
9.10.3P4-21.1, 9.9.9P1-39.1
bind-pkcs11
32:9.9.4-29.el7_2.4
bind-pkcs11-devel
32:9.9.4-29.el7_2.4
bind-pkcs11-libs
32:9.9.4-29.el7_2.4
bind-pkcs11-utils
32:9.9.4-29.el7_2.4
bind-sdb
30:9.3.6-25.P1.el5_11.9, 32:9.8.2-0.37.rc1.48.amzn1, 32:9.8.2-0.47.rc1.el6_8.1, 32:9.9.4-29.el7_2.4
bind-sdb-chroot
32:9.9.4-29.el7_2.4
bind-utils
30:9.3.6-25.P1.el5_11.9, 32:9.8.2-0.37.rc1.48.amzn1, 32:9.8.2-0.47.rc1.el6_8.1, 32:9.9.4-29.el7_2.4, 9.10.3P4-21.1, 9.9.6P1-0.30.1, 9.9.9P1-28.20.1, 9.9.9P1-39.1, 9.9.9P1-46.1
bind9
1:9.10.3.dfsg.P4-11, 1:9.10.3.dfsg.P4-8ubuntu1.1, 1:9.8.4.dfsg.P1-6+nmu2+deb7u11, 1:9.9.5.dfsg-3ubuntu0.9, 1:9.9.5.dfsg-9+deb8u7
bind97
32:9.7.0-21.P2.el5_11.7
bind97-chroot
32:9.7.0-21.P2.el5_11.7
bind97-devel
32:9.7.0-21.P2.el5_11.7
Timeline
Publicly disclosed
Sep 28, 2016
Added to Industry KEV feed
Oct 5, 2016
Last updated
Aug 7, 2026
Weakness Type
- CWE-20 Improper Input Validation
- CWE-617 Reachable Assertion
References
- advisoryRHSA-2016:1944
- advisoryRHSA-2016:1945
- advisoryRHSA-2016:2099
- advisoryhttps://bugzilla.suse.com/1000362
- advisoryhttps://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05321107
FAQ
Common Questions.
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.
Affected: Bind (Isc) versions 9.10.0, 9.10.0-a1, 9.10.0-a2, 9.10.0-b1, 9.10.0-b2, 9.10.0-p1, 9.10.0-p2, 9.10.0-rc1; Hp-Ux versions 11.31; Linux (Oracle) versions 5.0, 6, 7, among others. The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed since Oct 5, 2016.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including Bind 30:9.3.6-25.P1.el5_11.9, Bind 32:9.8.2-0.17.rc1.el6_4.9, Bind 32:9.8.2-0.37.rc1.48.amzn1.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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