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ISC BIND 9.11.3-S1 < 9.18.38-S1 / 9.18.11-S1 < 9.18.38-S1 / 9.20.9-S1 < 9.20.11-S1 Vulnerability (cve-2025-40776)

high Nessus Plugin ID 298818

Synopsis

The remote name server is affected by a vulnerability vulnerability.

Description

The version of ISC BIND installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the cve-2025-40776 advisory.

 - A `named` caching resolver that is configured to send ECS (EDNS Client Subnet) options may be vulnerable to a cache-poisoning attack. This issue affects BIND 9 versions 9.11.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.37-S1, and 9.20.9-S1 through 9.20.10-S1. (CVE-2025-40776)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade to ISC BIND version 9.18.38-S1 / 9.20.11-S1 or later.

See Also

https://kb.isc.org/v1/docs/cve-2025-40776

Plugin Details

Severity: High

ID: 298818

File Name: bind9_92011_s1_cve-2025-40776.nasl

Version: 1.1

Type: remote

Family: DNS

Published: 2/12/2026

Updated: 2/12/2026

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:C/A:N

CVSS Score Source: CVE-2025-40776

CVSS v3

Risk Factor: High

Base Score: 8.6

Temporal Score: 7.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:isc:bind

Required KB Items: bind/version, Settings/ParanoidReport

Exploit Ease: No known exploits are available

Patch Publication Date: 7/16/2025

Vulnerability Publication Date: 7/16/2025

Reference Information

CVE: CVE-2025-40776