CVE-2019-16866

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2022-05-24. NVD baseline CVSS 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 4 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 3.5%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Unbound before 1.9.4 accesses uninitialized memory, which allows remote attackers to trigger a crash via a crafted NOTIFY query. The source IP address of the query must match an access-control rule.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
50
EG Risk 50/100CISA 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
Severity75% × 45%
Exploitation4% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
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
3.5%
EPSS %ILE
88th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

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

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). 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 3, 2019

Last Modified

October 8, 2026

Advisory Details (6)

Auto-updated Oct 8, 2026
Patch available.
generic

[SECURITY] Fedora 31 Update: unbound-1.9.4-1.fc31 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MLRHE7TQFAOV4MB2ELTOGESZYUL65NUJ/
generic

[SECURITY] Fedora 30 Update: unbound-1.9.4-1.fc30 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/E65NCWZZB2D75ZIYWPXKMVGSGNYW4JMC/
generic

unbound/doc/Changelog at release-1.9.4 · NLnetLabs/unbound · GitHub

https://github.com/NLnetLabs/unbound/blob/release-1.9.4/doc/Changelog
generic

[SECURITY] [DSA 4544-1] unbound security update

https://www.debian.org/security/2019/dsa-4544
generic

Bugtraq: [SECURITY] [DSA 4544-1] unbound security update

https://seclists.org/bugtraq/2019/Oct/23
generic
https://nlnetlabs.nl/downloads/unbound/CVE-2019-16866.txt

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntuunbound (1.9.0-2ubuntu0.1) @ disco2026-10-08ubuntu

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

(22 across 22 ecosystems)
Alpine:v3.10(1)
PackageVulnerable rangeFix by version rangeDependents
unbound—
  • every version up to 1.9.1-r3: fixed in 1.9.1-r3
—
Alpine:v3.11(1)
PackageVulnerable rangeFix by version rangeDependents
unbound—
  • every version up to 1.9.4-r0: fixed in 1.9.4-r0
—
Alpine:v3.12(1)
PackageVulnerable rangeFix by version rangeDependents
unbound—
  • every version up to 1.9.4-r0: fixed in 1.9.4-r0
—
Alpine:v3.13(1)
PackageVulnerable rangeFix by version rangeDependents
unbound—
  • every version up to 1.9.4-r0: fixed in 1.9.4-r0
—
Alpine:v3.14(1)
PackageVulnerable rangeFix by version rangeDependents
unbound—
  • every version up to 1.9.4-r0: fixed in 1.9.4-r0
—
Alpine:v3.15(1)
PackageVulnerable rangeFix by version rangeDependents
unbound—
  • every version up to 1.9.4-r0: fixed in 1.9.4-r0
—
Alpine:v3.16(1)
PackageVulnerable rangeFix by version rangeDependents
unbound—
  • every version up to 1.9.4-r0: fixed in 1.9.4-r0
—
Alpine:v3.17(1)
PackageVulnerable rangeFix by version rangeDependents
unbound—
  • every version up to 1.9.4-r0: fixed in 1.9.4-r0
—
Alpine:v3.18(1)
PackageVulnerable rangeFix by version rangeDependents
unbound—
  • every version up to 1.9.4-r0: fixed in 1.9.4-r0
—
Alpine:v3.19(1)
PackageVulnerable rangeFix by version rangeDependents
unbound—
  • every version up to 1.9.4-r0: fixed in 1.9.4-r0
—
Alpine:v3.20(1)
PackageVulnerable rangeFix by version rangeDependents
unbound—
  • every version up to 1.9.4-r0: fixed in 1.9.4-r0
—
Alpine:v3.21(1)
PackageVulnerable rangeFix by version rangeDependents
unbound—
  • every version up to 1.9.4-r0: fixed in 1.9.4-r0
—
Alpine:v3.22(1)
PackageVulnerable rangeFix by version rangeDependents
unbound—
  • every version up to 1.9.4-r0: fixed in 1.9.4-r0
—
Alpine:v3.23(1)
PackageVulnerable rangeFix by version rangeDependents
unbound—
  • every version up to 1.9.4-r0: fixed in 1.9.4-r0
—
Alpine:v3.24(1)
PackageVulnerable rangeFix by version rangeDependents
unbound—
  • every version up to 1.9.4-r0: fixed in 1.9.4-r0
—
Alpine:v3.8(1)
PackageVulnerable rangeFix by version rangeDependents
unbound—
  • every version up to 1.7.3-r1: fixed in 1.7.3-r1
—
Alpine:v3.9(1)
PackageVulnerable rangeFix by version rangeDependents
unbound—
  • every version up to 1.8.3-r2: fixed in 1.8.3-r2
—
Debian:10(1)
PackageVulnerable rangeFix by version rangeDependents
unbound1.9.0-2
  • every version up to 1.9.0-2+deb10u1: fixed in 1.9.0-2+deb10u1
—
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
unbound—
  • every version up to 1.9.4-1: fixed in 1.9.4-1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
unbound—
  • every version up to 1.9.4-1: fixed in 1.9.4-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
unbound—
  • every version up to 1.9.4-1: fixed in 1.9.4-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
unbound—
  • every version up to 1.9.4-1: fixed in 1.9.4-1
—

Weakness Classification(2)

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

All Vendor Advisories

(1)

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 10× in last 7d / 30× 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 164 total refreshes for this CVE.

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

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2019-16866?
CVE-2019-16866 is a high vulnerability published on October 3, 2019. Unbound before 1.9.4 accesses uninitialized memory, which allows remote attackers to trigger a crash via a crafted NOTIFY query. The source IP address of the query must match an access-control rule.
When was CVE-2019-16866 disclosed?
CVE-2019-16866 was first published on October 3, 2019, with the most recent update on October 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2019-16866 actively exploited?
CVE-2019-16866 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 3.5% probability of exploitation in the next 30 days (88th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2019-16866?
CVE-2019-16866 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2019-16866?
A fix for CVE-2019-16866 is available: update to the fixed version the vendor names in its advisory.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2019-16866

Explore →

Is Your Infrastructure Affected by CVE-2019-16866?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs