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Vulnerability record · CVE-2018-5743 · published 9 October 2019

CVE-2018-5743: F5 big-ip local traffic manager allocation without limits vulnerability

F5 · Big Ip Local Traffic Manager

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.

7.5 CVSS 3.1 High EPSS 6.5% · top 6.5% CWE-770 · Allocation without limits
7.5CVSS 3.1 base score, v2 4.3
6.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
17Affected product versions listed by NVD
6References
17 Jun 2026Last modified by 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.

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

Affected products

17 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://kb.isc.org/docs/cve-2018-5743 Third Party Advisory
https://support.f5.com/csp/article/K74009656?utm_source=f5support&amp%3Butm_medium=RSS
https://www.synology.com/security/advisory/Synology_SA_19_20
https://kb.isc.org/docs/cve-2018-5743 Third Party Advisory
https://support.f5.com/csp/article/K74009656?utm_source=f5support&amp%3Butm_medium=RSS
https://www.synology.com/security/advisory/Synology_SA_19_20

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2018-5743), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.