CVE-2020-8621 HIGH

CVE-2020-8621: Attempting QNAME minimization after forwarding can lead to an assertion failure in resolver.c

Vendor Isc
Product BIND9
Published August 21, 2020
Last update September 16, 2024
View on NVD All CVEs

CVSS base score

7.5/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality None
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

What the vulnerability does

01Description

In BIND 9.14.0 -> 9.16.5, 9.17.0 -> 9.17.3, If a server is configured with both QNAME minimization and 'forward first' then an attacker who can send queries to it may be able to trigger the condition that will cause the server to crash. Servers that 'forward only' are not affected.

Key dates

02Disclosure timeline

August 21, 2020 CVE published
September 16, 2024 Record updated