CVE-2017-14493

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-14. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Weaponized
9.8
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 84%
CISA-KEV: Not listedEPSS: 84%CVSS: 9.8Exploit: NoneExposed: 0

A fix is available — apply it.

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.

CVSS v3
9.8
EG Score
9.8(medium)
EPSS
99.7%
KEV
Not listed

Published

October 3, 2017

Last Modified

May 13, 2026

Advisory Details (5)

Auto-updated Jun 21, 2026
⚠️ Active exploitation confirmed. No patch confirmed yet.
generic
http://www.securitytracker.com/id/1039474
generic
http://www.securityfocus.com/bid/101085
generic

[SECURITY] [DSA 3989-1] dnsmasq security update

http://www.debian.org/security/2017/dsa-3989
generic
http://thekelleys.org.uk/gitweb/?p=dnsmasq.git%3Ba=commit%3Bh=3d4ff1ba8419546490b464418223132529514033
generic🔴 Active Exploitation
http://thekelleys.org.uk/dnsmasq/CHANGELOG

Patch Availability(4)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntudnsmasq-utils (2.75-1ubuntu0.16.04.3) @ xenial2026-05-20ubuntu
ubuntudnsmasq-base (2.59-4ubuntu0.3) @ precise2026-05-20ubuntu
redhatdnsmasq-0:2.76-2.el7_4.22017-10-02redhat
redhatdnsmasq-0:2.66-21.el7_3.22017-10-02redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

All Vendor Advisories

(4)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 5× in last 7d / 17× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-07 13:42 UTCEPSS rescore
  2. 2026-07-06 02:20 UTCEPSS rescore
  3. 2026-07-05 02:27 UTCEPSS rescore
  4. 2026-07-01 15:02 UTCEPSS rescore
  5. 2026-07-01 15:02 UTCEPSS rescore
  6. 2026-06-28 04:53 UTCEPSS rescore
  7. 2026-06-25 13:47 UTCEPSS rescore
  8. 2026-06-25 13:47 UTCEPSS rescore
  9. 2026-06-23 21:30 UTCEPSS rescore
  10. 2026-06-19 13:55 UTCOSV refresh
  11. 2026-06-17 17:50 UTCEPSS rescore
  12. 2026-06-15 17:45 UTCEPSS rescore
  13. 2026-06-13 22:57 UTCEPSS rescore
  14. 2026-06-12 23:09 UTCEPSS rescore
  15. 2026-06-11 13:57 UTCEPSS rescore
  16. 2026-06-10 22:15 UTCEPSS rescore
  17. 2026-06-08 14:14 UTCEPSS rescore
  18. 2026-06-07 15:22 UTCEPSS rescore
  19. 2026-06-07 15:22 UTCEPSS rescore
  20. 2026-06-06 13:45 UTCEPSS rescore
  21. 2026-06-06 13:45 UTCEPSS rescore
  22. 2026-06-05 22:44 UTCEPSS rescore
  23. 2026-06-05 06:08 UTCEPSS rescore
  24. 2026-06-05 06:08 UTCEPSS rescore
  25. 2026-06-04 13:10 UTCEPSS rescore
Show 51 more
  1. 2026-06-04 13:10 UTCEPSS rescore
  2. 2026-06-02 20:11 UTCEPSS rescore
  3. 2026-06-02 20:11 UTCEPSS rescore
  4. 2026-05-31 22:28 UTCEPSS rescore
  5. 2026-05-31 00:14 UTCEPSS rescore
  6. 2026-05-30 21:23 UTCOSV refresh
  7. 2026-05-29 13:41 UTCEPSS rescore
  8. 2026-05-28 13:42 UTCEPSS rescore
  9. 2026-05-28 13:42 UTCEPSS rescore
  10. 2026-05-27 13:38 UTCEPSS rescore
  11. 2026-05-27 13:38 UTCEPSS rescore
  12. 2026-05-26 13:42 UTCEPSS rescore
  13. 2026-05-26 13:42 UTCEPSS rescore
  14. 2026-05-26 07:17 UTCEPSS rescore
  15. 2026-05-26 07:17 UTCEPSS rescore
  16. 2026-05-22 21:15 UTCEPSS rescore
  17. 2026-05-22 21:15 UTCEPSS rescore
  18. 2026-05-22 21:15 UTCEPSS rescore
  19. 2026-05-20 22:37 UTCEPSS rescore
  20. 2026-05-20 22:37 UTCEPSS rescore
  21. 2026-05-20 11:21 UTCEPSS rescore
  22. 2026-05-20 11:21 UTCEPSS rescore
  23. 2026-05-20 08:34 UTCEG score recompute
  24. 2026-05-20 08:34 UTCVendor advisory
  25. 2026-05-20 08:34 UTCGHSA enrichment
  26. 2026-05-20 04:31 UTCEG score recompute
  27. 2026-05-20 04:31 UTCVendor advisory
  28. 2026-05-20 04:31 UTCGHSA enrichment
  29. 2026-05-20 00:27 UTCEG score recompute
  30. 2026-05-20 00:27 UTCVendor advisory
  31. 2026-05-20 00:27 UTCGHSA enrichment
  32. 2026-05-19 20:24 UTCEG score recompute
  33. 2026-05-19 20:24 UTCVendor advisory
  34. 2026-05-19 20:24 UTCGHSA enrichment
  35. 2026-05-19 16:21 UTCEG score recompute
  36. 2026-05-19 16:21 UTCVendor advisory
  37. 2026-05-19 16:21 UTCGHSA enrichment
  38. 2026-05-19 12:18 UTCEG score recompute
  39. 2026-05-19 12:18 UTCVendor advisory
  40. 2026-05-19 12:18 UTCGHSA enrichment
  41. 2026-05-19 08:15 UTCEG score recompute
  42. 2026-05-19 08:15 UTCVendor advisory
  43. 2026-05-19 08:15 UTCGHSA enrichment
  44. 2026-05-19 04:13 UTCEG score recompute
  45. 2026-05-19 04:13 UTCVendor advisory
  46. 2026-05-19 04:13 UTCGHSA enrichment
  47. 2026-05-19 00:10 UTCEG score recompute
  48. 2026-05-19 00:10 UTCVendor advisory
  49. 2026-05-19 00:10 UTCGHSA enrichment
  50. 2026-05-18 21:30 UTCEPSS rescore
  51. 2026-05-18 21:30 UTCEPSS rescore

Publicly available exploits

(2 references)

Working exploit code is in the public domain (1 GitHub PoC) (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCpupiles/bof-dnsmasq-cve-2017-14493
    First seen Dec 4, 2018

    dnsmasq rop exploit with NX bypass

    Open source ↗
  • Exploit-DBEDB-42943✓ verified
    First seen Oct 2, 2017

    Dnsmasq < 2.78 - Stack Overflow

    Open source ↗

Frequently asked(5)

What is CVE-2017-14493?
CVE-2017-14493 is a critical vulnerability published on October 3, 2017. 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.
When was CVE-2017-14493 disclosed?
CVE-2017-14493 was first published in the National Vulnerability Database on October 3, 2017, with the most recent update on May 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2017-14493 actively exploited?
CVE-2017-14493 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 99.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2017-14493?
CVE-2017-14493 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2017-14493?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2017-14493, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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