Is CVE-2018-5743 in the CISA KEV catalog?

No. CVE-2018-5743 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2018-5743?

CVE-2018-5743 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2018-5743?

CVE-2018-5743 has an EPSS score of 6.40% (93th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2018-5743?

Upgrade bind9 on debian 11 to 1:9.11.5.P4+dfsg-4 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2018-5743

HIGHEPSS 93th pctl

7.5

CVSS v3

NVD

Description

By design, BIND is intended to limit the number of TCP clients that can be connected at any given time. The number of allowed connections is a tunable parameter which, if unset, defaults to a conservative value for most servers. Unfortunately, the code which was intended to limit the number of simultaneous connections contained an error which could be exploited to grow the number of simultaneous connections beyond this limit. Versions affected: BIND 9.9.0 -> 9.10.8-P1, 9.11.0 -> 9.11.6, 9.12.0 -> 9.12.4, 9.14.0. BIND 9 Supported Preview Edition versions 9.9.3-S1 -> 9.11.5-S3, and 9.11.5-S5. Versions 9.13.0 -> 9.13.7 of the 9.13 development branch are also affected. Versions prior to BIND 9.9.0 have not been evaluated for vulnerability to CVE-2018-5743.

CWE-770Allocation of Resources Without Limits or Throttling

How to fix

Remediation Available

bind9Debian

Fixed in:1:9.11.5.P4+dfsg-4CVE-2018-5743

bind9Ubuntu

Fixed in:1:9.9.5.dfsg-3ubuntu0.19+esm1USN-3956-2

Fixed in:1:9.10.3.dfsg.P4-8ubuntu1.14USN-3956-1

Fixed in:1:9.11.3+dfsg-1ubuntu1.7USN-3956-1

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

6.40%probability of exploitation in 30 days

93rdpercentile

High risk: more likely to be exploited than 93% of all known CVEs.

References

Third-Party Advisory1

kb.isc.org

Other references2

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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.