CVE-2020-12663

unbound: infinite loop via malformed DNS answers received from upstream servers

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Severity

Important

Red Hat Product Security

7.5

CVSS 3.1

Review impact separately from score.

Published · May 19, 2020

Updated · June 27, 2026

Description

A flaw was found in unbound in versions prior to 1.10.1. An infinite loop can be created when malformed DNS answers are received from upstream servers. The highest threat from this vulnerability is to system availability.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE-835 · Loop with Unreachable Exit Condition ('Infinite Loop')