Vulnerability in Isc Bind
CVE-2023-4236
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.022 (81.9th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 82nd percentile — 81.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.022 · newest: 0.022 · change: +0.000
Affected products
- Isc Bind — versions 9.18.11, 9.18.18
- Isc Bind 9 — versions 9.18.0, 9.18.11-S1
- NetApp H300s
- NetApp H300s Firmware
- NetApp H410c
- NetApp H410c Firmware
- NetApp H410s
- NetApp H410s Firmware
- NetApp H500s
- NetApp H500s Firmware
Weakness classification (CWE)
Public proof-of-concept exploits
References
- kb.isc.org/docs/cve-2023-4236 (vendor-advisory, Vendor Advisory)
- www.openwall.com/lists/oss-security/2023/09/20/2 (Mailing List, Third Party Advisory)
- www.debian.org/security/2023/dsa-5504 (Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (Mailing List)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (Mailing List)
- security.netapp.com/advisory/ntap-20231013-0004/ (Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2023-4236?
- CVE-2023-4236 is a high-severity vulnerability in Isc Bind, classified under Reachable Assertion. CVSS score: 7.5/10. Published 2023-09-20.
- How severe is CVE-2023-4236?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2023-4236 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.