CVE-2017-14491

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-04-30. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Weaponized
9.8EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 85%
  • Public exploit code is available (Exploit-DB (verified), epss top5pct, epss high, public exploit)
CISA-KEV: Not listedEPSS PROB: 85%CVSS: 9.8Exploit: Exploit-DB (verified) · epss top5pct · epss high · public exploitExposed services: Not assessed

A fix is available — apply it.

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.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
83
EG Risk 83/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation85% × 40%
Automatability30% × 15%
CISA SSVC: Track at low, Track* at medium and Attend at high mission impact.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
85%
EPSS %ILE
99th
KEV
Not listed

CISA SSVCTrack at low, Track* at medium and Attend at high mission impact.

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (EG-KEV: weaponized) · Automatable unknown (not published for this CVE) · Technical impact total (CVSS ≥ 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

October 4, 2017

Last Modified

June 17, 2026

Advisory Details (3)

Auto-updated Oct 6, 2026
⚠️ Active exploitation confirmed. Patch available.
generic
http://thekelleys.org.uk/gitweb/?p=dnsmasq.git%3Ba=commit%3Bh=0549c73b7ea6b22a3c49beb4d432f185a81efcbc
generic🔴 Active Exploitation
http://thekelleys.org.uk/dnsmasq/CHANGELOG
generic

Packet Storm

http://packetstormsecurity.com/files/144480/Dnsmasq-2-Byte-Heap-Based-Overflow.html

Patch Availability(8)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntudnsmasq-utils (2.76-5ubuntu0.1) @ zesty2026-05-20ubuntu
ubuntudnsmasq-base (2.59-4ubuntu0.3) @ precise2026-05-20ubuntu
redhatdnsmasq-0:2.45-2.el5_11.12017-10-02redhat
redhatdnsmasq-0:2.48-18.el6_92017-10-02redhat
redhatdnsmasq-0:2.48-16.el6_7.12017-10-02redhat
redhatdnsmasq-0:2.76-2.el7_4.22017-10-02redhat
redhatdnsmasq-0:2.66-21.el7_3.22017-10-02redhat
redhatdnsmasq-0:2.45-2.el5_9.12017-10-02redhat

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.

Affected Packages

(29 across 29 ecosystems)
Alpine:v3.10(1)
PackageVulnerable rangeFix by version rangeDependents
dnsmasq—
  • every version up to 2.78-r0: fixed in 2.78-r0
—
Alpine:v3.11(1)
PackageVulnerable rangeFix by version rangeDependents
dnsmasq—
  • every version up to 2.78-r0: fixed in 2.78-r0
—
Alpine:v3.12(1)
PackageVulnerable rangeFix by version rangeDependents
dnsmasq—
  • every version up to 2.78-r0: fixed in 2.78-r0
—
Alpine:v3.13(1)
PackageVulnerable rangeFix by version rangeDependents
dnsmasq—
  • every version up to 2.78-r0: fixed in 2.78-r0
—
Alpine:v3.14(1)
PackageVulnerable rangeFix by version rangeDependents
dnsmasq—
  • every version up to 2.78-r0: fixed in 2.78-r0
—
Alpine:v3.15(1)
PackageVulnerable rangeFix by version rangeDependents
dnsmasq—
  • every version up to 2.78-r0: fixed in 2.78-r0
—
Alpine:v3.16(1)
PackageVulnerable rangeFix by version rangeDependents
dnsmasq—
  • every version up to 2.78-r0: fixed in 2.78-r0
—
Alpine:v3.17(1)
PackageVulnerable rangeFix by version rangeDependents
dnsmasq—
  • every version up to 2.78-r0: fixed in 2.78-r0
—
Alpine:v3.18(1)
PackageVulnerable rangeFix by version rangeDependents
dnsmasq—
  • every version up to 2.78-r0: fixed in 2.78-r0
—
Alpine:v3.19(1)
PackageVulnerable rangeFix by version rangeDependents
dnsmasq—
  • every version up to 2.78-r0: fixed in 2.78-r0
—
Alpine:v3.20(1)
PackageVulnerable rangeFix by version rangeDependents
dnsmasq—
  • every version up to 2.78-r0: fixed in 2.78-r0
—
Alpine:v3.21(1)
PackageVulnerable rangeFix by version rangeDependents
dnsmasq—
  • every version up to 2.78-r0: fixed in 2.78-r0
—
Alpine:v3.22(1)
PackageVulnerable rangeFix by version rangeDependents
dnsmasq—
  • every version up to 2.78-r0: fixed in 2.78-r0
—
Alpine:v3.23(1)
PackageVulnerable rangeFix by version rangeDependents
dnsmasq—
  • every version up to 2.78-r0: fixed in 2.78-r0
—
Alpine:v3.24(1)
PackageVulnerable rangeFix by version rangeDependents
dnsmasq—
  • every version up to 2.78-r0: fixed in 2.78-r0
—
Alpine:v3.3(1)
PackageVulnerable rangeFix by version rangeDependents
dnsmasq—
  • every version up to 2.76-r1: fixed in 2.76-r1
—
Alpine:v3.4(1)
PackageVulnerable rangeFix by version rangeDependents
dnsmasq—
  • every version up to 2.76-r1: fixed in 2.76-r1
—
Alpine:v3.5(1)
PackageVulnerable rangeFix by version rangeDependents
dnsmasq—
  • every version up to 2.76-r2: fixed in 2.76-r2
—
Alpine:v3.6(1)
PackageVulnerable rangeFix by version rangeDependents
dnsmasq—
  • every version up to 2.76-r5: fixed in 2.76-r5
—
Alpine:v3.7(1)
PackageVulnerable rangeFix by version rangeDependents
dnsmasq—
  • every version up to 2.78-r0: fixed in 2.78-r0
—
Alpine:v3.8(1)
PackageVulnerable rangeFix by version rangeDependents
dnsmasq—
  • every version up to 2.78-r0: fixed in 2.78-r0
—
Alpine:v3.9(1)
PackageVulnerable rangeFix by version rangeDependents
dnsmasq—
  • every version up to 2.78-r0: fixed in 2.78-r0
—
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
dnsmasq—
  • every version up to 2.78-1: fixed in 2.78-1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
dnsmasq—
  • every version up to 2.78-1: fixed in 2.78-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
dnsmasq—
  • every version up to 2.78-1: fixed in 2.78-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
dnsmasq—
  • every version up to 2.78-1: fixed in 2.78-1
—
Debian:7(1)
PackageVulnerable rangeFix by version rangeDependents
dnsmasq2.62-3+deb7u1, 2.62-3+deb7u2, 2.62-3+deb7u3
  • every version up to 2.62-3+deb7u4: fixed in 2.62-3+deb7u4
—
Debian:8(1)
PackageVulnerable rangeFix by version rangeDependents
dnsmasq2.72-3, 2.72-3+deb8u1
  • every version up to 2.72-3+deb8u2: fixed in 2.72-3+deb8u2
—
Debian:9(1)
PackageVulnerable rangeFix by version rangeDependents
dnsmasq2.76-5
  • every version up to 2.76-5+deb9u1: fixed in 2.76-5+deb9u1
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(8)

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 3× in last 7d / 10× 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.

Showing the most recent 100 of 105 total refreshes for this CVE.

  1. 2026-10-07 23:41 UTCEPSS rescore
  2. 2026-10-05 17:38 UTCEPSS rescore
  3. 2026-10-04 03:38 UTCOSV refresh
  4. 2026-09-30 09:27 UTCEG score recompute
  5. 2026-09-28 13:45 UTCEPSS rescore
  6. 2026-09-24 13:59 UTCEPSS rescore
  7. 2026-09-18 19:22 UTCEPSS rescore
  8. 2026-09-17 19:22 UTCEPSS rescore
  9. 2026-09-14 18:14 UTCOSV refresh
  10. 2026-09-12 14:55 UTCEPSS rescore
  11. 2026-09-10 09:26 UTCEPSS rescore
  12. 2026-09-07 15:56 UTCEPSS rescore
  13. 2026-09-04 05:01 UTCEPSS rescore
  14. 2026-08-30 19:13 UTCEPSS rescore
  15. 2026-08-28 21:36 UTCEPSS rescore
  16. 2026-08-26 17:36 UTCOSV refresh
  17. 2026-08-26 14:41 UTCEPSS rescore
  18. 2026-08-24 14:10 UTCEPSS rescore
  19. 2026-08-21 23:44 UTCEPSS rescore
  20. 2026-08-19 16:59 UTCEPSS rescore
  21. 2026-08-15 01:26 UTCEPSS rescore
  22. 2026-08-10 07:40 UTCOSV refresh
  23. 2026-07-30 16:24 UTCEPSS rescore
  24. 2026-07-25 08:11 UTCOSV refresh
  25. 2026-07-23 14:15 UTCEPSS rescore
Show 75 more
  1. 2026-07-23 01:27 UTCEG score recompute
  2. 2026-07-22 22:06 UTCEG score recompute
  3. 2026-07-22 14:04 UTCEPSS rescore
  4. 2026-07-20 17:04 UTCEPSS rescore
  5. 2026-07-20 17:04 UTCEPSS rescore
  6. 2026-07-16 16:59 UTCEPSS rescore
  7. 2026-07-16 16:59 UTCEPSS rescore
  8. 2026-07-15 16:54 UTCEPSS rescore
  9. 2026-07-15 16:54 UTCEPSS rescore
  10. 2026-07-13 06:09 UTCEPSS rescore
  11. 2026-07-09 19:06 UTCEPSS rescore
  12. 2026-07-08 03:05 UTCOSV refresh
  13. 2026-07-04 06:28 UTCEPSS rescore
  14. 2026-07-01 15:02 UTCEPSS rescore
  15. 2026-07-01 15:02 UTCEPSS rescore
  16. 2026-06-27 03:05 UTCEPSS rescore
  17. 2026-06-24 14:02 UTCEPSS rescore
  18. 2026-06-23 21:30 UTCEPSS rescore
  19. 2026-06-21 14:54 UTCEPSS rescore
  20. 2026-06-21 14:54 UTCEPSS rescore
  21. 2026-06-19 14:55 UTCOSV refresh
  22. 2026-06-15 17:45 UTCEPSS rescore
  23. 2026-06-14 23:14 UTCEPSS rescore
  24. 2026-06-14 23:14 UTCEPSS rescore
  25. 2026-06-13 22:57 UTCEPSS rescore
  26. 2026-06-12 23:09 UTCEPSS rescore
  27. 2026-06-11 13:57 UTCEPSS rescore
  28. 2026-06-10 22:15 UTCEPSS rescore
  29. 2026-06-07 15:22 UTCEPSS rescore
  30. 2026-06-07 15:22 UTCEPSS rescore
  31. 2026-06-06 13:45 UTCEPSS rescore
  32. 2026-06-06 13:45 UTCEPSS rescore
  33. 2026-06-05 22:44 UTCEPSS rescore
  34. 2026-06-05 06:08 UTCEPSS rescore
  35. 2026-06-05 06:08 UTCEPSS rescore
  36. 2026-06-04 13:10 UTCEPSS rescore
  37. 2026-06-04 13:10 UTCEPSS rescore
  38. 2026-06-02 20:11 UTCEPSS rescore
  39. 2026-06-02 20:11 UTCEPSS rescore
  40. 2026-05-31 22:28 UTCEPSS rescore
  41. 2026-05-31 00:14 UTCEPSS rescore
  42. 2026-05-30 21:53 UTCOSV refresh
  43. 2026-05-29 13:41 UTCEPSS rescore
  44. 2026-05-28 13:42 UTCEPSS rescore
  45. 2026-05-28 13:42 UTCEPSS rescore
  46. 2026-05-27 13:38 UTCEPSS rescore
  47. 2026-05-27 13:38 UTCEPSS rescore
  48. 2026-05-26 13:42 UTCEPSS rescore
  49. 2026-05-26 13:42 UTCEPSS rescore
  50. 2026-05-26 07:17 UTCEPSS rescore
  51. 2026-05-26 07:17 UTCEPSS rescore
  52. 2026-05-22 21:15 UTCEPSS rescore
  53. 2026-05-22 21:15 UTCEPSS rescore
  54. 2026-05-22 21:15 UTCEPSS rescore
  55. 2026-05-20 22:37 UTCEPSS rescore
  56. 2026-05-20 22:37 UTCEPSS rescore
  57. 2026-05-20 11:21 UTCEPSS rescore
  58. 2026-05-20 11:21 UTCEPSS rescore
  59. 2026-05-20 08:46 UTCVendor advisory
  60. 2026-05-20 08:46 UTCGHSA enrichment
  61. 2026-05-20 05:02 UTCVendor advisory
  62. 2026-05-20 05:02 UTCGHSA enrichment
  63. 2026-05-20 01:18 UTCVendor advisory
  64. 2026-05-20 01:18 UTCGHSA enrichment
  65. 2026-05-19 21:34 UTCVendor advisory
  66. 2026-05-19 21:34 UTCGHSA enrichment
  67. 2026-05-19 17:50 UTCVendor advisory
  68. 2026-05-19 17:50 UTCGHSA enrichment
  69. 2026-05-19 14:06 UTCVendor advisory
  70. 2026-05-19 14:06 UTCGHSA enrichment
  71. 2026-05-19 10:22 UTCVendor advisory
  72. 2026-05-19 10:22 UTCGHSA enrichment
  73. 2026-05-19 06:37 UTCVendor advisory
  74. 2026-05-19 06:37 UTCGHSA enrichment
  75. 2026-05-19 02:53 UTCVendor advisory

Publicly available exploits

(1 reference)

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

  • Exploit-DBEDB-42941✓ verified
    First seen Oct 2, 2017

    Dnsmasq < 2.78 - 2-byte Heap Overflow

    Open source ↗

Related CVEs(same product + same vendor + same CWE)

Frequently asked(5)

What is CVE-2017-14491?
CVE-2017-14491 is a critical vulnerability published on October 4, 2017. 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.
When was CVE-2017-14491 disclosed?
CVE-2017-14491 was first published on October 4, 2017, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2017-14491 actively exploited?
CVE-2017-14491 is not currently on CISA's Known Exploited Vulnerabilities catalog. EchelonGraph's EG-KEV model classifies it as weaponized: a functional public exploit exists. FIRST EPSS estimates a 85% probability of exploitation in the next 30 days (99th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2017-14491?
CVE-2017-14491 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2017-14491?
A fix for CVE-2017-14491 is available: update to the fixed version the vendor names in its advisory.

Dependency Blast Radius

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