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Fencer Vulns
medium 5.9

CVE-2020-14312 json

A flaw was found in the default configuration of dnsmasq, as shipped with Fedora versions prior to 31 and in all versions Red Hat Enterpris…

published 2021-02-05 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-6464

cvss
5.9
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.2%
EPSS 1.2% chance of exploitation in 30 days, percentile 69%
public exploits
0
none known

Summary

A flaw was found in the default configuration of dnsmasq, as shipped with Fedora versions prior to 31 and in all versions Red Hat Enterprise Linux, where it listens on any interface and accepts queries from addresses outside of its local subnet. In particular, the option `local-service` is not enabled. Running dnsmasq in this manner may inadvertently make it an open resolver accessible from any address on the internet. This flaw allows an attacker to conduct a Distributed Denial of Service (DDoS) against other systems.

Patch / fix

  • fedoraproject fedora 31
  • dnsmasq Debian 14, Debian 13, Debian 12 2.69-1

debian advisories DEBIAN-CVE-2020-14312

  • dnsmasq SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLES 15 SP1-BCL +7 more 2.86-7.14.1

suse advisories SUSE-SU-2021:3530-1

  • dnsmasq openSUSE Tumbleweed 2.86-3.1
  • dnsmasq openSUSE Leap 15.2 2.86-lp152.7.6.1
  • dnsmasq openSUSE Leap 15.3 2.86-7.14.1

opensuse advisories openSUSE-SU-2024:11653-1openSUSE-SU-2021:1426-1openSUSE-SU-2021:3530-1

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-2020-14312 updated cvss 4.0

dnsmasq: insecure default configuration makes it an open resolver

  • Red Hat Enterprise Linux 5 dnsmasq Red Hat Enterprise Linux 6 dnsmasq, dnsmasq-utils
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 7 dnsmasq, dnsmasq-utils Red Hat Enterprise Linux 8 dnsmasq, dnsmasq-utils
    affected: workaround, no fix planned “Will not fix”
  • Red Hat OpenStack Platform 10 (Newton) dnsmasq-utils
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat OpenStack Platform 13 (Queens) dnsmasq-utils
    not affected: vulnerable code not present

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

1.24% chance of exploitation in the next 30 days, higher than 69% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:N/A:P

Affected products

  • n/a dnsmasq

Classification

Weakness

References

Sources

Fencer Vulns 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.