Public proof of conceptFix available

CVE-2017-14491

Q: Is CVE-2017-14491 actively exploited?

Active exploitation of CVE-2017-14491 has not been confirmed. Its EPSS score was 86.5% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2017-14491?

CVE-2017-14491 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

A public proof of concept exists; no exploitation attested.

Published2017-10-04
Fixed in8.1.0.4 · 6.5.4.2 · 6.5.3.3 · 6.5.1.9 · 6.4.4.16 · 6.3.1.25
WeaknessCWE-787

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Heap-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 DNS response.

Timeline

dates in UTC

2017-10-0401:29CVE publishedNVD
2026-10-2319:23First public proof of conceptPoC-in-GitHub
2026-10-2319:23EPSS crossed 10 %FIRST EPSS

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2017-14491?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2017-14491?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Arubanetworks arubaos

Branch	Affected	Fixed in	Source
8.1	≥ 8.1.0.0, < 8.1.0.4	8.1.0.4	NVD
6.5	≥ 6.5.4.0, < 6.5.4.2	6.5.4.2	NVD
6.5	≥ 6.5.3.0, < 6.5.3.3	6.5.3.3	NVD
6.5	≥ 6.5.0.0, < 6.5.1.9	6.5.1.9	NVD
6.4	≥ 6.4.4.0, < 6.4.4.16	6.4.4.16	NVD
6.3	≥ 6.3.1, < 6.3.1.25	6.3.1.25	NVD

Arista eos

Branch	Affected	Fixed in	Source
4.17	≥ 4.17, < 4.17.8m	4.17.8m	NVD
4.16	≥ 4.16, < 4.16.13m	4.16.13m	NVD
4.15	≤ 4.15	no fix published	NVD
4.18	≥ 4.18, ≤ 4.18.4.2f	no fix published	NVD

Canonical ubuntu linux

Branch	Affected	Fixed in	Source
12.4	= 12.04	no fix published	NVD
14.4	= 14.04	no fix published	NVD
16.4	= 16.04	no fix published	NVD
17.4	= 17.04	no fix published	NVD

18 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

ICSA-17-332-01 CISA3 known affected
Siemens SCALANCE W1750D, M800, S615, and RUGGEDCOM RM1224 (Update C)
Siemens RUGGEDCOM RM1224: All versions < V5.0 · Siemens SCALANCE M-800 / S615: All versions < V5.0 · Siemens SCALANCE W1750D: All versions < V6.5.1.5

Full record on NVD

Fix

Update Arubanetworks arubaos to 8.1.0.4 · 6.5.4.2 · 6.5.3.3 · 6.5.1.9 · 6.4.4.16 · 6.3.1.25
Vendor fix CISA ICSA-17-332-01 · 2 productsUpdate to V5.0 or later version https://support.industry.siemens.com/cs/ww/en/view/109757544
Vendor fix CISA ICSA-17-332-01 · 1 productUpdate to V6.5.1.5 or later version https://support.industry.siemens.com/cs/ww/en/view/109778052
Mitigation from the vendor CISA ICSA-17-332-01 · 2 productsSCALANCE M-800 / S615 and RUGGEDCOM RM1224: Disable DNS proxy in the device configuration (System - DNS - DNS Proxy - Disable Checkbox 'Enable DNS Proxy'), and configure the connected devices in the internal network to use a different DNS server
Mitigation from the vendor CISA ICSA-17-332-01 · 1 productSCALANCE W1750D: If 'OpenDNS', 'Captive Portal' or 'URL redirection' functionality is not used, deploy firewall rules in the device configuration to block incoming access to port 53/UDP

Advisories and patches

thekelleys.org.ukRelease Notes · Vendor Advisory
cert-portal.siemens.comPatch
www.arista.comMitigation

Detection

read 2026-10-23 19:23 UTC

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: 1 repository, unverifiedskyformat99/dnsmasq-2.4.1-fix-CVE-2017-14491

Sources

NVDCVSS 3.19.8read 2026-10-23
NVDCVSS 2.07.5read 2026-10-23
NVDweakness (CWE)CWE-787read 2026-10-23
FIRST EPSSEPSS score86.5 %read 2026-10-23
PoC-in-GitHubproof of concept1read 2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: 2017-10-04
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2017-14491?

Heap-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 DNS response.

Is CVE-2017-14491 actively exploited?

Active exploitation of CVE-2017-14491 has not been confirmed. Its EPSS score was 86.5% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2017-14491?

CVE-2017-14491 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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