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CVE-2017-14494

70
FAUCET Score

CVE-2017-14494 is an information leakage vulnerability in dnsmasq versions prior to 2.78, specifically when configured as a relay. It allows remote attackers to obtain sensitive memory information by manipulating DHCPv6 forwarded requests, impacting various Linux distributions and embedded devices. The vulnerability has a CVSS v3 score of 5.9 (Medium), indicating a network-based attack with high complexity and a high impact on confidentiality. While not listed in CISA's KEV catalog, public exploit code exists (EDB-42944), and it has garnered significant community discussion and media coverage, suggesting a heightened awareness of its potential.

Impacted Technologies

VendorProductVersion(s)CPE
14.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
16.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
17.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:17.04:*:*:*:*:*:*:*
7.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*
7.1CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:7.1:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

5.9MEDIUM

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
2.2
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
67.55%
Probability of exploitation in next 30 days
EPSS Percentile
99.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
ExploitDB: EDB-42944 · Oct 2, 2017
This CVE's current EPSS score of 0.6755 is in the 100th percentile among its peer group of 19,954 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (4)

redhatpatch availablevia nvd_reference
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: dnsmasq-0:2.76-2.el7_4.2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7.2 Extended Update SupportFixed in: dnsmasq-0:2.66-14.el7_2.2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7.3 Extended Update SupportFixed in: dnsmasq-0:2.66-21.el7_3.2
View patch

Vendor Advisories (1)

redhatCVE-2017-14494Important

dnsmasq: information leak in the DHCPv6 relay code

Oct 2, 2017

References

lists.opensuse.org / opensuse-security-announce/2017-10/msg00006.html
Issue TrackingMailing ListThird Party Advisory
nvidia.custhelp.com / app/answers/detail/a_id/4561
access.redhat.com / errata/RHSA-2017:2836
PatchThird Party Advisory
access.redhat.com / errata/RHSA-2017:2837
PatchThird Party Advisory
access.redhat.com / security/vulnerabilities/3199382
Issue TrackingThird Party Advisory
security.gentoo.org / glsa/201710-27
security.googleblog.com / 2017/10/behind-masq-yet-more-dns-and-dhcp.html
Third Party Advisory
exploit-db.com / exploits/42944
Third Party AdvisoryVDB Entry
kb.cert.org / vuls/id/973527
Third Party AdvisoryUS Government Resource
mail-archive.com / dnsmasq-discuss%40lists.thekelleys.org.uk/msg11664.html
mail-archive.com / dnsmasq-discuss%40lists.thekelleys.org.uk/msg11665.html
synology.com / support/security/Synology_SA_17_59_Dnsmasq
thekelleys.org.uk / dnsmasq/CHANGELOG
Release NotesVendor Advisory
thekelleys.org.uk / gitweb
arubanetworks.com / assets/alert/ARUBA-PSA-2017-005.txt
debian.org / security/2017/dsa-3989
Third Party Advisory
securityfocus.com / bid/101085
Third Party AdvisoryVDB Entry
securitytracker.com / id/1039474
Third Party AdvisoryVDB Entry
ubuntu.com / usn/USN-3430-1
Third Party Advisory
ubuntu.com / usn/USN-3430-2
Third Party Advisory