CVE-2019-6473 — A packet containing a malformed DUID can cause the kea-dhcp6 server to terminate

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MEDIUM

A packet containing a malformed DUID can cause the kea-dhcp6 server to terminate

Published Oct 16, 2019

6.5

MEDIUM

CVSS 3.1

EPSS 0.80%

Description

An invalid hostname option can trigger an assertion failure in the Kea DHCPv4 server process (kea-dhcp4), causing the server process to exit. Versions affected: 1.4.0 to 1.5.0, 1.6.0-beta1, and 1.6.0-beta2.

Affected products

Vendor ISC Product Kea Default
n/a
- Version
  1.4.0 to 1.5.0
  Status
  affected
  Constraints
  -
- Version
  1.6.0-beta1
  Status
  affected
  Constraints
  -
- Version
  1.6.0-beta2
  Status
  affected
  Constraints
  -

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

ISC

Kea

n/a

Version	Status	Constraints
1.4.0 to 1.5.0	affected	-
1.6.0-beta1	affected	-
1.6.0-beta2	affected	-

Remediation

Vendor solution

Upgrade to a version of Kea containing a fix, available via https://www.isc.org/downloads.

- Kea 1.4.0-P2 - Kea 1.5.0-P1 - Kea 1.6.0

Metrics

0.80% 0.00803

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.

EPSS probability 0.00803

Score over time

2021–2026

EPSS v1
EPSS v5
EPSS v2
EPSS v3

Percentile over time

EPSS v1
EPSS v5
EPSS v2
EPSS v3

Table of values (9 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 1, 2026	0.80% (0.00803)	55.11th	v5 (v2026.06.15)
Sep 20, 2026	0.80% (0.00803)	55.15th	v5 (v2026.06.15)
Jul 20, 2024	0.06% (0.00058)	25.44th	v3 (v2023.03.01)
May 25, 2024	0.06% (0.00058)	24.68th	v3 (v2023.03.01)
Mar 7, 2023	0.06% (0.00058)	22.67th	v3 (v2023.03.01)
Mar 6, 2023	0.89% (0.00885)	27.89th	v2 (v2022.01.01)
Jan 6, 2022	1.84% (0.01840)	47.32th	v1
Jan 5, 2022	0.42% (0.00416)	26.65th	v5 (v2026.06.15)
Apr 14, 2021	0.42% (0.00416)	0.00th	v1

Weaknesses (1)

CWE-617

References (1)

https://kb.isc.org/docs/cve-2019-6473
x_refsource_CONFIRMVendor Advisory

Link	Providers	Tags
https://kb.isc.org/docs/cve-2019-6473		x_refsource_CONFIRMVendor Advisory

Change history (0)

No recorded changes yet.

Sources

CVE.org / MITRE

Status PUBLISHED

Assigner isc

Published Oct 16, 2019

Updated Sep 16, 2024

Reserved Jan 16, 2019

Link CVE-2019-6473

CISA Vulnrichment

Updated n/a

NVD

Status Modified

Modified Jun 17, 2026

Link CVE-2019-6473

Red Hat

Severity n/a

Public date n/a

Links CVE-2019-6473