CVE-2016-0746

Use-after-free vulnerability in the resolver in nginx 0.6.18 through 1.8.0 and 1.9.x before 1.9.10 allows remote attackers to cause a denial of service (worker process crash) or possibly have unspecified other impact via a crafted DNS response related to CNAME response processing.

Published: 2016-02-15 Last update: 2026-05-06 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2016-0746 is rated High Risk (74.5/100): CVSS Critical severity, with high exploitation likelihood (EPSS 8.62%, 94th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +2.28% over the last day, indicating growing attacker interest. 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-2016-0746

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 2026-06-15 6.34% 8.62% +2.28%
2 2026-05-20 6.50% 6.34% -0.16%
3 2026-05-07 — 6.50% —

Full EPSS history (41 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2016-0746

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]
7.5 2.0 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P 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:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-2016-0746

OS Trackers for CVE-2016-0746

vendor priority summary link
debian not yet assigned CVE-2016-0746 not yet assigned priority: Debian including 1 source packages (nginx), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2016-0746
gentoo normal CVE-2016-0746: 1 GLSA(s) (201606-06), 1 atom(s) (www-servers/nginx); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2016-0746
redhat medium — https://access.redhat.com/security/cve/CVE-2016-0746
suse low CVE-2016-0746 severity low: SUSE including 19 source package names (GeoIP-1.4.7-2.10.1, libGeoIP1-1.4.7-2.10.1, …), 27 product×package rows across 15 product lines (SUSE Lifecycle Management Server 1.3, SUSE Linux Enterprise High Performance Computing 15-LTSS, … (15 product lines)): Fixed 23, Known Not Affected 4. https://www.suse.com/security/cve/CVE-2016-0746/
ubuntu medium CVE-2016-0746 medium priority: Ubuntu including 1 source packages (nginx), 8 status rows across 8 suites (precise, trusty, upstream, vivid, wily, xenial, yakkety, zesty): released 6, ignored 2. https://ubuntu.com/security/CVE-2016-0746

Affected software / configurations for CVE-2016-0746

Vendor Product Version Raw CPE
f5 nginx >= 0.6.18, <= 1.8.0 cpe:2.3:a:f5:nginx:*:*:*:*:*:*:*:*
f5 nginx >= 1.9.0, < 1.9.10 cpe:2.3:a:f5:nginx:*:*:*:*:*:*:*:*
canonical ubuntu_linux 14.04 cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:*
canonical ubuntu_linux 15.10 cpe:2.3:o:canonical:ubuntu_linux:15.10:*:*:*:*:*:*:*
debian debian_linux 7.0 cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*
debian debian_linux 8.0 cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
debian debian_linux 9.0 cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
opensuse leap 42.1 cpe:2.3:o:opensuse:leap:42.1:*:*:*:*:*:*:*
apple xcode < 13.0 cpe:2.3:a:apple:xcode:*:*:*:*:*:*:*:*

References for CVE-2016-0746

URL Tags
http://lists.opensuse.org/opensuse-updates/2016-02/msg00042.html Mailing List Third Party Advisory
http://mailman.nginx.org/pipermail/nginx/2016-January/049700.html Vendor Advisory
http://seclists.org/fulldisclosure/2021/Sep/36 Mailing List Third Party Advisory
http://www.debian.org/security/2016/dsa-3473 Third Party Advisory
http://www.securitytracker.com/id/1034869 Third Party Advisory VDB Entry
http://www.ubuntu.com/usn/USN-2892-1 Third Party Advisory
https://access.redhat.com/errata/RHSA-2016:1425 Third Party Advisory
https://bto.bluecoat.com/security-advisory/sa115 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1302588 Issue Tracking Patch Third Party Advisory
https://security.gentoo.org/glsa/201606-06 Third Party Advisory
https://support.apple.com/kb/HT212818 Third Party Advisory
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