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Fencer Intel
critical 9.8

CVE-2017-14493 in the critical feed json

Stack-based buffer overflow in dnsmasq before 2.78 allows remote attackers to cause a denial of service (crash) or execute arbitrary code v…

published 9y ago modified 4mo ago also EUVD-2017-5996

cvss
9.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
85.2%
EPSS 85.2% chance of exploitation in 30 days, percentile 99.7%
public exploits
1
Exploit-DB

Summary

Stack-based buffer overflow in dnsmasq before 2.78 allows remote attackers to cause a denial of service (crash) or execute arbitrary code via a crafted DHCPv6 request.

Patch / fix

  • dnsmasq Debian 14, Debian 13, Debian 12 2.78-1

debian advisories DEBIAN-CVE-2017-14493

  • dnsmasq Ubuntu 14.04 LTS 2.68-1ubuntu0.2
  • dnsmasq Ubuntu 16.04 LTS 2.75-1ubuntu0.16.04.3

ubuntu advisories UBUNTU-CVE-2017-14493

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

  • dnsmasq RHEL 7 2.76-2.el7_4.2
  • dnsmasq-utils RHEL 7 2.76-2.el7_4.2
  • dnsmasq RHEL 7.2 EUS 2.66-14.el7_2.2
  • dnsmasq RHEL 7.3 EUS 2.66-21.el7_3.2
  • dnsmasq-utils RHEL 7.2 EUS 2.66-14.el7_2.2
  • dnsmasq-utils RHEL 7.3 EUS 2.66-21.el7_3.2

red hat advisories RHSA-2017:2837RHSA-2017:2836

  • dnsmasq SLES 11 SP3-TERADATA, SLES 11 SP3-LTSS, SLE Point of Sale 11 SP3 2.78-0.16.5.1
  • dnsmasq SLES for SAP 12 SP3, SLES for SAP 12 SP2, SLES for SAP 12 SP1 +8 more 2.78-18.3.1
  • dnsmasq SLES for SAP 11 SP4, SLES 11 SP4 2.78-0.17.5.1
  • dnsmasq SLES 12-LTSS 2.78-6.6.1

suse advisories SUSE-SU-2017:2617-1SUSE-SU-2017:2616-1SUSE-SU-2017:2618-1SUSE-SU-2017:2619-1

  • dnsmasq openSUSE Tumbleweed 2.86-1.1

opensuse advisories openSUSE-SU-2024:10721-1

  • dnsmasq Alpine 3.24, Alpine 3.23, Alpine 3.22 +15 more 2.78-r0
  • dnsmasq Alpine 3.4, Alpine 3.3 2.76-r1
  • dnsmasq Alpine 3.5 2.76-r2
  • dnsmasq Alpine 3.6 2.76-r5

alpine advisories ALPINE-CVE-2017-14493

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • dnsmasq Arch Linux 2.78-1

arch linux advisories AVG-421

Is CVE-2017-14493 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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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-2017-14493 updated cvss 8.8

dnsmasq: stack buffer overflow in the DHCPv6 code

  • Red Hat Enterprise Linux Client (v. 7) dnsmasq 2.76-2.el7_4.2 Red Hat Enterprise Linux Client Optional (v. 7) dnsmasq-utils 2.76-2.el7_4.2 Red Hat Enterprise Linux ComputeNode (v. 7) dnsmasq 2.76-2.el7_4.2
    fixed: vendor fix RHSA-2017:2836
  • Red Hat Enterprise Linux ComputeNode EUS (v. 7.2) dnsmasq 2.66-14.el7_2.2 Red Hat Enterprise Linux ComputeNode EUS (v. 7.3) dnsmasq 2.66-21.el7_3.2
    fixed: vendor fix RHSA-2017:2837
  • Red Hat Enterprise Linux ComputeNode Optional (v. 7) dnsmasq-utils 2.76-2.el7_4.2
    fixed: vendor fix RHSA-2017:2836
  • Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.2) dnsmasq-utils 2.66-14.el7_2.2 Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.3) dnsmasq-utils 2.66-21.el7_3.2
    fixed: vendor fix RHSA-2017:2837
  • Red Hat Enterprise Linux Server (v. 7) dnsmasq 2.76-2.el7_4.2
    fixed: vendor fix RHSA-2017:2836
  • Red Hat Enterprise Linux Server EUS (v. 7.2) dnsmasq 2.66-14.el7_2.2 Red Hat Enterprise Linux Server EUS (v. 7.3) dnsmasq 2.66-21.el7_3.2
    fixed: vendor fix RHSA-2017:2837
  • Red Hat Enterprise Linux Server Optional (v. 7) dnsmasq-utils 2.76-2.el7_4.2
    fixed: vendor fix RHSA-2017:2836
  • Red Hat Enterprise Linux Server Optional EUS (v. 7.2) dnsmasq-utils 2.66-14.el7_2.2 Red Hat Enterprise Linux Server Optional EUS (v. 7.3) dnsmasq-utils 2.66-21.el7_3.2
    fixed: vendor fix RHSA-2017:2837
show 2 more
  • Red Hat Enterprise Linux Workstation (v. 7) dnsmasq 2.76-2.el7_4.2 Red Hat Enterprise Linux Workstation Optional (v. 7) dnsmasq-utils 2.76-2.el7_4.2
    fixed: vendor fix RHSA-2017:2836
  • Red Hat Enterprise Linux 5 dnsmasq Red Hat Enterprise Linux 6 dnsmasq, dnsmasq-utils Red Hat Enterprise Linux OpenStack Platform 6 (Juno) dnsmasq Red Hat Enterprise Linux OpenStack Platform 7 (Kilo) dnsmasq-utils Red Hat OpenStack Platform 8 (Liberty) dnsmasq-utils Red Hat OpenStack Platform 9 (Mitaka) dnsmasq-utils
    +3 more products
    Red Hat OpenStack Platform 10 (Newton) dnsmasq-utils Red Hat OpenStack Platform 11 (Ocata) dnsmasq Red Hat OpenStack Platform 12 (Pike) 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

Timeline

  1. First public exploit (EDB-42943)
  2. Published

Exploit prediction

85.24% chance of exploitation in the next 30 days, higher than 99.7% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • EDB-42943 Dnsmasq < 2.78 - Stack Overflow dos, 2017-10-02

CVSS scores

assigned by version score vector
NVD 3.0 9.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

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.