CVE-2018-5743

What it is

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.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of service disruption.

Exploit odds

6.4% chance of exploitation in the next 30 days (EPSS).

Fix

No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

1. 2019-10-09 16:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 02:00 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 6.4% in the next 30 days (EPSS).
• Severity: 7.5 HIGH (CVSS).
• Fix: none linked yet, which raises it.

Details

Published

2019-10-09 16:15 UTC

Last modified

2026-06-17 02:00 UTC

Exploit probability

6.4% · EPSS, next 30 days

Weakness

CWE-770 · Allocation without limits

Record status

Modified

Affected

• f5 big-ip Local Traffic Manager ≤ 11.6.5
• f5 big-ip Local Traffic Manager ≤ 12.1.4
• f5 big-ip Local Traffic Manager ≤ 13.1.1
• f5 big-ip Local Traffic Manager ≤ 14.1.0
• f5 big-ip Local Traffic Manager 15.0.0
• f5 big-ip Application Acceleration Manager ≤ 11.6.5
• f5 big-ip Application Acceleration Manager ≤ 12.1.4
• f5 big-ip Application Acceleration Manager ≤ 13.1.1

Attack profile CVSS 3.1 · 7.5

Attack vector

Network

Complexity

Low

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2018-5743.md and follow it. Check whether this project is affected by CVE-2018-5743. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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