CVE-2018-5743

Limiting simultaneous TCP clients was ineffective

HIGH

7.5

CVSS Score

Published: October 9, 2019 at 02:17 PM UTC

Updated: June 17, 2026 at 02:00 AM UTC

17 products affected across 2 vendorsBig IP Access Policy ManagerBig IP Application Security ManagerBig IP Advanced Firewall Manager

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Severity

HIGH7.5

Exploit prediction

EPSS 6%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Big IP Access Policy Manager · F5

95%

11.5.2 ≤ v ≤ 11.6.512.1.0 ≤ v ≤ 12.1.413.1.0 ≤ v ≤ 13.1.114.0.0 ≤ v ≤ 14.1.015.0.0

Big IP Advanced Firewall Manager · F5

95%

11.5.2 ≤ v ≤ 11.6.512.1.0 ≤ v ≤ 12.1.413.1.0 ≤ v ≤ 13.1.114.0.0 ≤ v ≤ 14.1.015.0.0

Big IP Analytics · F5

95%

11.5.2 ≤ v ≤ 11.6.512.1.0 ≤ v ≤ 12.1.413.0.0 ≤ v ≤ 13.1.114.0.0 ≤ v ≤ 14.1.015.0.0

Big IP Application Acceleration Manager · F5

95%

11.5.2 ≤ v ≤ 11.6.512.1.0 ≤ v ≤ 12.1.413.0.0 ≤ v ≤ 13.1.114.0.0 ≤ v ≤ 14.1.015.0.0

Big IP Application Security Manager · F5

95%

11.5.2 ≤ v ≤ 11.6.512.1.0 ≤ v ≤ 12.1.413.0.0 ≤ v ≤ 13.1.114.0.0 ≤ v ≤ 14.1.115.0.0

Big IP Domain Name System · F5

95%

11.5.2 ≤ v ≤ 11.6.512.1.0 ≤ v ≤ 12.1.413.1.0 ≤ v ≤ 13.1.114.0.0 ≤ v ≤ 14.1.015.0.0

Big IP Edge Gateway · F5

95%

11.5.2 ≤ v ≤ 11.6.512.1.0 ≤ v ≤ 12.1.413.0.0 ≤ v ≤ 13.1.114.0.0 ≤ v ≤ 14.1.015.0.0

Big IP Fraud Protection Service · F5

95%

11.5.2 ≤ v ≤ 11.6.512.1.0 ≤ v ≤ 12.1.413.0.0 ≤ v ≤ 13.1.114.0.0 ≤ v ≤ 14.1.015.0.0

Big IP Global Traffic Manager · F5

95%

11.5.2 ≤ v ≤ 11.6.512.1.0 ≤ v ≤ 12.1.413.0.0 ≤ v ≤ 13.1.114.0.0 ≤ v ≤ 14.1.015.0.0

Big IP Link Controller · F5

95%

11.5.2 ≤ v ≤ 11.6.512.1.0 ≤ v ≤ 12.1.413.0.0 ≤ v ≤ 13.1.114.0.0 ≤ v ≤ 14.1.015.0.0

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (3)

x_refsource_CONFIRMThird Party Advisory

Source: [email protected]

https://kb.isc.org/docs/cve-2018-5743

x_refsource_CONFIRM

Source: [email protected]

https://support.f5.com/csp/article/K74009656?utm_source=f5support&amp%3Butm_medium=RSS

x_refsource_CONFIRM

Source: [email protected]

https://www.synology.com/security/advisory/Synology_SA_19_20

CVSS

7.5HIGH[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: NONE
Availability: HIGH

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-770

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