ISC BIND Service Downgrade / Reflected DoS

high Nessus Plugin ID 136769


The remote name server is affected by Service Downgrade / Reflected DoS vulnerabilities.


According to its self-reported version, the instance of ISC BIND 9 running on the remote name server is affected by performance downgrade and Reflected DoS vulnerabilities. This is due to BIND DNS not sufficiently limiting the number fetches which may be performed while processing a referral response.

An unauthenticated, remote attacker can exploit this to cause degrade the service of the recursive server or to use the affected server as a reflector in a reflection attack.


Upgrade to the ISC BIND version referenced in the vendor advisory.

See Also

Plugin Details

Severity: High

ID: 136769

File Name: bind9_CVE-2020-8616.nasl

Version: 1.3

Type: remote

Family: DNS

Published: 5/22/2020

Updated: 6/26/2020

Risk Information


Risk Factor: Medium

Score: 5.2


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-2020-8616


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:N/A:H

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

Vulnerability Information

CPE: cpe:/a:isc:bind

Required KB Items: bind/version

Exploit Ease: No known exploits are available

Patch Publication Date: 5/19/2020

Vulnerability Publication Date: 5/19/2020

Reference Information

CVE: CVE-2020-8616

IAVA: 2020-A-0217-S