CVE-2016-2775

ISC BIND 9.x before 9.9.9-P2, 9.10.x before 9.10.4-P2, and 9.11.x before 9.11.0b2, when lwresd or the named lwres option is enabled, allows remote attackers to cause a denial of service (daemon crash) via a long request that uses the lightweight resolver protocol.

Published: 2016-07-19 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2016-2775 is rated Moderate Risk (58.7/100): CVSS Medium severity, with high exploitation likelihood (EPSS 63.35%, 99th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. High exploitation likelihood—assess exposure and prioritize remediation.

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

Exploit prediction scoring system (EPSS) score for CVE-2016-2775

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 2026-06-20 62.95% 63.35% +0.40%
2 2026-06-15 43.30% 62.95% +19.65%
3 2026-03-26 — 43.30% —

Full EPSS history (54 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2016-2775

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.9 3.1 MEDIUM
CVSS:3.1/AV:N/AC:H/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:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
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.
 2.2 3.6 [email protected]
4.3 2.0 MEDIUM
AV:N/AC:M/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.6 2.9 [email protected]

Weakness enumeration for CVE-2016-2775

OS Trackers for CVE-2016-2775

vendor priority summary link
debian not yet assigned CVE-2016-2775 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-2016-2775
gentoo normal CVE-2016-2775: 1 GLSA(s) (201610-07), 1 atom(s) (net-dns/bind); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2016-2775
redhat medium — https://access.redhat.com/security/cve/CVE-2016-2775
suse low CVE-2016-2775 severity low: SUSE including 438 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, …), 703 product×package rows across 62 product lines (SUSE CaaS Platform 4.0, SUSE Linux Enterprise Desktop 12 SP1, … (62 product lines)): Fixed 395, Known Affected 157, Known Not Affected 151. https://www.suse.com/security/cve/CVE-2016-2775/
ubuntu medium CVE-2016-2775 medium priority: Ubuntu including 1 source packages (bind9), 18 status rows across 18 suites (artful, bionic, cosmic, disco, eoan, focal, groovy, hirsute, impish, jammy, kinetic, precise, trusty, upstream, wily, xenial, yakkety, zesty): not-affected 10, ignored 5, released 2, needs-triage 1. https://ubuntu.com/security/CVE-2016-2775

Affected software / configurations for CVE-2016-2775

Vendor Product Version Raw CPE
hp hp-ux b.11.31 cpe:2.3:o:hp:hp-ux:b.11.31:*:*:*:*:*:*:*
isc bind >= 9.0, <= 9.9.8 cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*
isc bind >= 9.10.0, <= 9.10.3 cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*
isc bind 9.9.9 cpe:2.3:a:isc:bind:9.9.9:-:*:*:*:*:*:*
isc bind 9.9.9 cpe:2.3:a:isc:bind:9.9.9:b1:*:*:*:*:*:*
isc bind 9.9.9 cpe:2.3:a:isc:bind:9.9.9:b2:*:*:*:*:*:*
isc bind 9.9.9 cpe:2.3:a:isc:bind:9.9.9:p1:*:*:*:*:*:*
isc bind 9.9.9 cpe:2.3:a:isc:bind:9.9.9:rc1:*:*:*:*:*:*
isc bind 9.9.9 cpe:2.3:a:isc:bind:9.9.9:s1:*:*:*:*:*:*
isc bind 9.9.9 cpe:2.3:a:isc:bind:9.9.9:s1rc1:*:*:*:*:*:*
isc bind 9.10.4 cpe:2.3:a:isc:bind:9.10.4:-:*:*:*:*:*:*
isc bind 9.10.4 cpe:2.3:a:isc:bind:9.10.4:beta1:*:*:*:*:*:*
isc bind 9.10.4 cpe:2.3:a:isc:bind:9.10.4:beta2:*:*:*:*:*:*
isc bind 9.10.4 cpe:2.3:a:isc:bind:9.10.4:beta3:*:*:*:*:*:*
isc bind 9.10.4 cpe:2.3:a:isc:bind:9.10.4:p1:*:*:*:*:*:*
isc bind 9.11.0 cpe:2.3:a:isc:bind:9.11.0:-:*:*:*:*:*:*
isc bind 9.11.0 cpe:2.3:a:isc:bind:9.11.0:alpha1:*:*:*:*:*:*
isc bind 9.11.0 cpe:2.3:a:isc:bind:9.11.0:alpha2:*:*:*:*:*:*
isc bind 9.11.0 cpe:2.3:a:isc:bind:9.11.0:alpha3:*:*:*:*:*:*
isc bind 9.11.0 cpe:2.3:a:isc:bind:9.11.0:beta1:*:*:*:*:*:*
fedoraproject fedora 23 cpe:2.3:o:fedoraproject:fedora:23:*:*:*:*:*:*:*
fedoraproject fedora 24 cpe:2.3:o:fedoraproject:fedora:24:*:*:*:*:*:*:*
redhat enterprise_linux_desktop 6.0 cpe:2.3:o:redhat:enterprise_linux_desktop:6.0:*:*:*:*:*:*:*
redhat enterprise_linux_desktop 7.0 cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:*
redhat enterprise_linux_eus 7.2 cpe:2.3:o:redhat:enterprise_linux_eus:7.2:*:*:*:*:*:*:*
redhat enterprise_linux_eus 7.3 cpe:2.3:o:redhat:enterprise_linux_eus:7.3:*:*:*:*:*:*:*
redhat enterprise_linux_eus 7.4 cpe:2.3:o:redhat:enterprise_linux_eus:7.4:*:*:*:*:*:*:*
redhat enterprise_linux_eus 7.5 cpe:2.3:o:redhat:enterprise_linux_eus:7.5:*:*:*:*:*:*:*
redhat enterprise_linux_eus 7.6 cpe:2.3:o:redhat:enterprise_linux_eus:7.6:*:*:*:*:*:*:*
redhat enterprise_linux_eus 7.7 cpe:2.3:o:redhat:enterprise_linux_eus:7.7:*:*:*:*:*:*:*
redhat enterprise_linux_server 6.0 cpe:2.3:o:redhat:enterprise_linux_server:6.0:*:*:*:*:*:*:*
redhat enterprise_linux_server 7.0 cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:*
redhat enterprise_linux_server_aus 7.2 cpe:2.3:o:redhat:enterprise_linux_server_aus:7.2:*:*:*:*:*:*:*
redhat enterprise_linux_server_aus 7.3 cpe:2.3:o:redhat:enterprise_linux_server_aus:7.3:*:*:*:*:*:*:*
redhat enterprise_linux_server_aus 7.6 cpe:2.3:o:redhat:enterprise_linux_server_aus:7.6:*:*:*:*:*:*:*
redhat enterprise_linux_server_aus 7.7 cpe:2.3:o:redhat:enterprise_linux_server_aus:7.7:*:*:*:*:*:*:*
redhat enterprise_linux_server_tus 7.2 cpe:2.3:o:redhat:enterprise_linux_server_tus:7.2:*:*:*:*:*:*:*
redhat enterprise_linux_server_tus 7.3 cpe:2.3:o:redhat:enterprise_linux_server_tus:7.3:*:*:*:*:*:*:*
redhat enterprise_linux_server_tus 7.6 cpe:2.3:o:redhat:enterprise_linux_server_tus:7.6:*:*:*:*:*:*:*
redhat enterprise_linux_server_tus 7.7 cpe:2.3:o:redhat:enterprise_linux_server_tus:7.7:*:*:*:*:*:*:*
redhat enterprise_linux_workstation 6.0 cpe:2.3:o:redhat:enterprise_linux_workstation:6.0:*:*:*:*:*:*:*
redhat enterprise_linux_workstation 7.0 cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:*

References for CVE-2016-2775

URL Tags
http://www.securityfocus.com/bid/92037 Third Party Advisory VDB Entry
http://www.securitytracker.com/id/1036360 Third Party Advisory VDB Entry
https://access.redhat.com/errata/RHBA-2017:0651 Third Party Advisory
https://access.redhat.com/errata/RHBA-2017:1767 Third Party Advisory
https://access.redhat.com/errata/RHSA-2017:2533 Third Party Advisory
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05321107 Patch Vendor Advisory
https://kb.isc.org/article/AA-01393/74/CVE-2016-2775 Patch Vendor Advisory
https://kb.isc.org/article/AA-01435 Broken Link
https://kb.isc.org/article/AA-01436 Broken Link
https://kb.isc.org/article/AA-01438 Broken Link
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7T2WJP5ELO4ZRSBXSETIZ3GAO6KOEFTA/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MZUCSMEOZIZ2R2SKA4FPLTOVZHJBAOWC/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NJ5STNEUHBNEPUHJT7CYEVSMATFYMIX7/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TT754KDUJTKOASJODJX7FKHCOQ6EC7UX/
https://security.gentoo.org/glsa/201610-07 Third Party Advisory
https://security.netapp.com/advisory/ntap-20160722-0002/ Third Party Advisory
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