CVE-2023-4236 HIGH

CVE-2023-4236: named may terminate unexpectedly under high DNS-over-TLS query load

Vendor Isc
Product BIND 9
Published September 20, 2023
Last update February 13, 2025
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

A flaw in the networking code handling DNS-over-TLS queries may cause `named` to terminate unexpectedly due to an assertion failure. This happens when internal data structures are incorrectly reused under significant DNS-over-TLS query load. This issue affects BIND 9 versions 9.18.0 through 9.18.18 and 9.18.11-S1 through 9.18.18-S1.

Key dates

02Disclosure timeline

September 20, 2023 CVE published
February 13, 2025 Record updated