VULNERABILITY INTELLIGENCE

CVE-2023-4236

CVSS score7.5 HIGH

EPSS probability2.19%

CISA KEVNot currently listed

Published2023-09-20

Last modified2026-06-17

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

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.

Weakness classification

CWE-617: Reachable Assertion

Primary references

security-officer@isc.org — Mailing List, Third Party Advisory
security-officer@isc.org — Vendor Advisory
security-officer@isc.org — Mailing List
security-officer@isc.org — Mailing List
security-officer@isc.org — Mailing List, Third Party Advisory
security-officer@isc.org — Third Party Advisory
security-officer@isc.org — Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 — Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 — Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108 — Mailing List
af854a3a-2127-422b-91ae-364da2661108 — Mailing List
af854a3a-2127-422b-91ae-364da2661108 — Mailing List, Third Party Advisory