Is CVE-2023-4236 in the CISA KEV catalog?

No. CVE-2023-4236 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2023-4236?

CVE-2023-4236 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2023-4236?

CVE-2023-4236 has an EPSS score of 2.15% (80th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2023-4236?

Upgrade bind9 on debian 12 to 1:9.18.19-1~deb12u1 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2023-4236

HIGHEPSS 80th pctl

7.5

CVSS v3

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.

CWE-617

How to fix

Remediation Available

bind9Debian

Fixed in:1:9.18.19-1~deb12u1CVE-2023-4236

Fixed in:1:9.19.17-1CVE-2023-4236

bind9Ubuntu

Fixed in:1:9.16.1-0ubuntu2.16USN-6390-1

Fixed in:1:9.18.12-0ubuntu0.22.04.3USN-6390-1

Fixed in:1:9.18.12-1ubuntu1.2USN-6390-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

2.15%probability of exploitation in 30 days

80thpercentile

Elevated risk: more likely to be exploited than 80% of all known CVEs.

References

Vendor Advisory1

kb.isc.org

Third-Party Advisory4

Mailing List2

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.