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No exploitation reported

CVE-2018-5743

No exploitation reported by the sources we read.

  • Published2019-10-09
  • WeaknessCWE-770

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2019-10-0916:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2018-5743?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2018-5743?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Isc bind
BranchAffectedFixed in
9.x≥ 9.9.0, ≤ 9.10.8no fix published
9.11≥ 9.11.0, ≤ 9.11.6no fix published
9.12≥ 9.12.0, ≤ 9.12.4no fix published
9.13≥ 9.13.0, ≤ 9.13.7no fix published
9.9= 9.9.3no fix published
9.10= 9.10.8no fix published
9.11= 9.11.5no fix published
9.14= 9.14.0no fix published
F5 big-ip access policy manager
BranchAffectedFixed in
11.x≥ 11.5.2, ≤ 11.6.5no fix published
12.1≥ 12.1.0, ≤ 12.1.4no fix published
13.1≥ 13.1.0, ≤ 13.1.1no fix published
14.x≥ 14.0.0, ≤ 14.1.0no fix published
15.0= 15.0.0no fix published
F5 big-ip advanced firewall manager
BranchAffectedFixed in
11.x≥ 11.5.2, ≤ 11.6.5no fix published
12.1≥ 12.1.0, ≤ 12.1.4no fix published
13.1≥ 13.1.0, ≤ 13.1.1no fix published
14.x≥ 14.0.0, ≤ 14.1.0no fix published
15.0= 15.0.0no fix published

14 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

  • NVDCVSS 3.17.5read 2026-10-23
  • CNACVSS 3.07.5read 2026-10-23
  • NVDCVSS 2.04.3read 2026-10-23
  • NVDweakness (CWE)CWE-770read 2026-10-23
  • FIRST EPSSEPSS score6.5 %2026-10-22

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2019-10-09
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2018-5743?

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.

Is CVE-2018-5743 actively exploited?

Active exploitation of CVE-2018-5743 has not been confirmed. Its EPSS score was 6.5% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

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

CVE-2018-5743 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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