Reference page — cumulative record through Monday, October 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2019-16866

CVE-2019-16866HIGH

n/a n/a — Unbound before 1.9.4 accesses uninitialized memory, which allows remote attackers to trigger a crash via a crafted NOTIFY query.

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  U  N  N  H    7.5   .0351   89.0     —

AFFECTED
  Product  Versions  Fixed
  n/a      n/a –     —

TIMELINE
  Sep 25  Reserved by mitre
  Oct 3   Published (CNA: mitre)
  Oct 8   ENRICHED — CVE-2019-16866. Received CVSS 7.5 and CPE data from NVD.

CWE-755, CWE-908 · CNA: mitre · CVSS v3.1 · 7 references · NVD status: Modified

Description

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
September 25, 2019	Reserved	Reserved by mitre
October 3, 2019	Published	Published (CNA: mitre)
October 8, 2026	ENRICHED	ENRICHED — CVE-2019-16866. Received CVSS 7.5 and CPE data from NVD.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
n/a	n/a	—	n/a	—

Weaknesses

CWE-755 · CWE-908

References (7)

Authoritative record: CVE-2019-16866 at cve.org

Weaknesses: CWE-755 · CWE-908

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2019-16866 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Monday, October 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.