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Vulnerability record · CVE-2023-4236 · published 20 September 2023

CVE-2023-4236: Isc bind vulnerability

Isc · Bind

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.

7.5 CVSS 3.1 High EPSS 2.2% · top 18.1% CWE-617 · CWE-617
7.5CVSS 3.1 base score
2.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
8Affected product versions listed by NVD
14References
17 Jun 2026Last modified by NVD

Description

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.

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

Affected products

8 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.openwall.com/lists/oss-security/2023/09/20/2 Mailing ListThird Party Advisory
https://kb.isc.org/docs/cve-2023-4236 Vendor Advisory
https://lists.fedoraproject.org/archives/list/[email protected]/message/IPJLLTJCSDJJII7IIZPLTBQNW Mailing List
https://lists.fedoraproject.org/archives/list/[email protected]/message/U35OARLQCPMVCBBPHWBXY5M6X Mailing List
https://lists.fedoraproject.org/archives/list/[email protected]/message/VSK5V4W4OHPM3JTJGWAQD6CZW Mailing ListThird Party Advisory
https://security.netapp.com/advisory/ntap-20231013-0004/ Third Party Advisory
https://www.debian.org/security/2023/dsa-5504 Third Party Advisory
http://www.openwall.com/lists/oss-security/2023/09/20/2 Mailing ListThird Party Advisory
https://kb.isc.org/docs/cve-2023-4236 Vendor Advisory
https://lists.fedoraproject.org/archives/list/[email protected]/message/IPJLLTJCSDJJII7IIZPLTBQNW Mailing List
https://lists.fedoraproject.org/archives/list/[email protected]/message/U35OARLQCPMVCBBPHWBXY5M6X Mailing List
https://lists.fedoraproject.org/archives/list/[email protected]/message/VSK5V4W4OHPM3JTJGWAQD6CZW Mailing ListThird Party Advisory
https://security.netapp.com/advisory/ntap-20231013-0004/ Third Party Advisory
https://www.debian.org/security/2023/dsa-5504 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2023-4236), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.