ISC BIND 9.16.19 / 9.16.19-S1 / 9.17.16 Assertion Failure (CVE-2021-25218)

high Nessus Plugin ID 152682


The remote name server is affected by an assertion failure vulnerability vulnerability.


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-2021-25218 advisory.

- In BIND 9.16.19, 9.17.16. Also, version 9.16.19-S1 of BIND Supported Preview Edition When a vulnerable version of named receives a query under the circumstances described above, the named process will terminate due to a failed assertion check. The vulnerability affects only BIND 9 releases 9.16.19, 9.17.16, and release 9.16.19-S1 of the BIND Supported Preview Edition. (CVE-2021-25218)

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


Upgrade to ISC BIND version 9.16.20 / 9.17.17 or later.

See Also

Plugin Details

Severity: High

ID: 152682

File Name: bind9_91717.nasl

Version: 1.5

Type: remote

Family: DNS

Published: 8/19/2021

Updated: 11/9/2021

Configuration: Enable paranoid mode

Risk Information


Risk Factor: Medium

Score: 4.4


Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

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

CVSS Score Source: CVE-2021-25218


Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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

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

Vulnerability Information

CPE: cpe:/a:isc:bind

Required KB Items: Settings/ParanoidReport, bind/version

Exploit Ease: No known exploits are available

Patch Publication Date: 8/18/2021

Vulnerability Publication Date: 8/18/2021

Reference Information

CVE: CVE-2021-25218

IAVA: 2021-A-0391-S