CVE-2023-4236

moderate-risk

Published 2023-09-20

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.

Do I need to act?

0.18% chance of exploitation

EPSS score — low exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 7.5/10 High

NETWORK / LOW complexity

Affected Products (13)

Bind

Fedora

Debian Linux

H300S Firmware

H500S Firmware

H700S Firmware

H410S Firmware

H410C Firmware

Affected Vendors

Debian Isc Fedoraproject Netapp

References (14)

Mailing List http://www.openwall.com/lists/oss-security/2023/09/20/2

Vendor Advisory https://kb.isc.org/docs/cve-2023-4236

Mailing List https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproje...

Third Party Advisory https://security.netapp.com/advisory/ntap-20231013-0004/

Third Party Advisory https://www.debian.org/security/2023/dsa-5504

Mailing List http://www.openwall.com/lists/oss-security/2023/09/20/2

Vendor Advisory https://kb.isc.org/docs/cve-2023-4236

Mailing List https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproje...

Third Party Advisory https://security.netapp.com/advisory/ntap-20231013-0004/

Third Party Advisory https://www.debian.org/security/2023/dsa-5504

/ 100

moderate-risk

Severity 26/34 · High

Exploitability 1/34 · Minimal

Exposure 17/34 · Moderate