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Fencer Intel
medium 5.3

CVE-2016-0747 json

The resolver in nginx before 1.8.1 and 1.9.x before 1.9.10 does not properly limit CNAME resolution, which allows remote attackers to cause…

published 2016-02-15 10 y ago modified 2026-06-17 4 mo ago also EUVD-2016-0770

cvss
5.3
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
8.7%
EPSS 8.7% chance of exploitation in 30 days, percentile 95%
public exploits
0
none known

Summary

The resolver in nginx before 1.8.1 and 1.9.x before 1.9.10 does not properly limit CNAME resolution, which allows remote attackers to cause a denial of service (worker process resource consumption) via vectors related to arbitrary name resolution.

Patch / fix

  • f5 nginx 1.8.1, 1.9.10
  • apple xcode 13.0
  • nginx Debian 14, Debian 13, Debian 12 1.9.10-1

debian advisories DEBIAN-CVE-2016-0747

  • nginx Ubuntu 14.04 LTS 1.4.6-1ubuntu3.4
  • nginx Ubuntu 16.04 LTS 1.9.10-0ubuntu1

ubuntu advisories UBUNTU-CVE-2016-0747

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

  • rh-nginx18-nginx RHEL 2 SOFTWARE_COLLECTIONS 1:1.8.1-1.el6
  • rh-nginx18-nginx RHEL 2 SOFTWARE_COLLECTIONS 1:1.8.1-1.el7

red hat advisories RHSA-2016:1425

  • nginx-1.0 WebYast 1.3, Studio Onsite 1.3, Lifecycle Management Server 1.3 1.0.15-0.29.2
  • GeoIP WebYast 1.3, Studio Onsite 1.3, Lifecycle Management Server 1.3 1.4.7-2.10.1

suse advisories SUSE-SU-2016:1232-1

  • nginx openSUSE Tumbleweed 1.11.4-2.5

opensuse advisories openSUSE-SU-2024:10044-1

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-2016-0747 updated cvss 4.3

nginx: Insufficient limits of CNAME resolution in resolver

  • Red Hat Software Collections nginx16-nginx
    affected: no fix planned “Will not fix”
  • Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 6) rh-nginx18-nginx 1.8.1-1.el6 Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7) rh-nginx18-nginx 1.8.1-1.el7 Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 6.6) rh-nginx18-nginx 1.8.1-1.el6 Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 6.7) rh-nginx18-nginx 1.8.1-1.el6 Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.1) rh-nginx18-nginx 1.8.1-1.el7 Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.2) rh-nginx18-nginx 1.8.1-1.el7
    +2 more products
    Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 6) rh-nginx18-nginx 1.8.1-1.el6 Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7) rh-nginx18-nginx 1.8.1-1.el7
    fixed: vendor fix RHSA-2016:1425

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

Exploit prediction

8.66% chance of exploitation in the next 30 days, higher than 95% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption
Technology feeds

References

Sources

Fencer Intel 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.