CVE-2019-6469 — BIND Supported Preview Edition can exit with an assertion failure if ECS is in use

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HIGH

BIND Supported Preview Edition can exit with an assertion failure if ECS is in use

Published Oct 9, 2019

7.5

HIGH

CVSS 3.1

EPSS 1.96%

Description

An error in the EDNS Client Subnet (ECS) feature for recursive resolvers can cause BIND to exit with an assertion failure when processing a response that has malformed RRSIGs. Versions affected: BIND 9.10.5-S1 -> 9.11.6-S1 of BIND 9 Supported Preview Edition.

Affected products

Vendor ISC Product BIND 9 Supported Preview Edition Default
n/a
- Version
  BIND 9.10.5-S1 -> 9.11.6-S1 of BIND 9 Supported Preview Edition.
  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

BIND 9 Supported Preview Edition

n/a

Version	Status	Constraints
BIND 9.10.5-S1 -> 9.11.6-S1 of BIND 9 Supported Preview Edition.	affected	-

Red Hat Enterprise Linux 5

bind

Not affected
Red Hat Enterprise Linux 5

bind97

Not affected
Red Hat Enterprise Linux 6

bind

Not affected
Red Hat Enterprise Linux 7

bind

Not affected
Red Hat Enterprise Linux 8

bind

Not affected

Product	Package	State	Advisory
Red Hat Enterprise Linux 5	bind	Not affected	n/a
Red Hat Enterprise Linux 5	bind97	Not affected	n/a
Red Hat Enterprise Linux 6	bind	Not affected	n/a
Red Hat Enterprise Linux 7	bind	Not affected	n/a
Red Hat Enterprise Linux 8	bind	Not affected	n/a

Remediation

Vendor solution

Upgrade to the patched release most closely related to your current version of BIND:

BIND Supported Preview Edition is a special feature preview branch of BIND provided to eligible ISC support customers.

>= BIND 9.11.7-S1

Red Hat statement

This flaw only affects the BIND Supported Preview Edition version. Packages shipped with Red Hat Enterprise Linux are not affected by this flaw.

Metrics

1.96% 0.01962

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

EPSS probability 0.01962

Score over time

2021–2026

EPSS v1
EPSS v5
EPSS v2
EPSS v3
EPSS v4

Percentile over time

EPSS v1
EPSS v5
EPSS v2
EPSS v3
EPSS v4

Table of values (13 key points)

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

Date	Score	Percentile	Model
Oct 1, 2026	1.96% (0.01962)	79.60th	v5 (v2026.06.15)
Jun 15, 2026	2.20% (0.02201)	80.14th	v5 (v2026.06.15)
Mar 29, 2025	2.04% (0.02039)	73.08th	v4 (v2025.03.14)
Jul 20, 2024	0.11% (0.00112)	45.15th	v3 (v2023.03.01)
Jul 3, 2024	0.11% (0.00112)	45.04th	v3 (v2023.03.01)
Mar 7, 2023	0.11% (0.00112)	43.03th	v3 (v2023.03.01)
Mar 6, 2023	0.89% (0.00885)	27.89th	v2 (v2022.01.01)
Apr 1, 2022	0.89% (0.00885)	24.24th	v2 (v2022.01.01)
Feb 4, 2022	4.50% (0.04499)	74.08th	v2 (v2022.01.01)
Feb 3, 2022	2.74% (0.02742)	63.06th	v5 (v2026.06.15)
Jan 6, 2022	2.74% (0.02742)	62.72th	v1
Sep 1, 2021	0.62% (0.00624)	45.04th	v1
Apr 14, 2021	0.62% (0.00624)	0.00th	v1

Weaknesses (2)

CWE-20

Improper Input Validation

CWE-617

References (6)

https://access.redhat.com/security/cve/CVE-2019-6469
Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1715352
Issue Tracking
https://kb.isc.org/docs/cve-2019-6469
x_refsource_CONFIRMThird Party Advisory
https://nvd.nist.gov/vuln/detail/CVE-2019-6469
https://support.f5.com/csp/article/K39751401?utm_source=f5support&amp%3Butm_medium=RSS
x_refsource_CONFIRM
https://www.cve.org/CVERecord?id=CVE-2019-6469

Link	Providers	Tags
https://access.redhat.com/security/cve/CVE-2019-6469		Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1715352		Issue Tracking
https://kb.isc.org/docs/cve-2019-6469		x_refsource_CONFIRMThird Party Advisory
https://nvd.nist.gov/vuln/detail/CVE-2019-6469
https://support.f5.com/csp/article/K39751401?utm_source=f5support&amp%3Butm_medium=RSS		x_refsource_CONFIRM
https://www.cve.org/CVERecord?id=CVE-2019-6469