CVE-2018-5538

Name: CVE-2018-5538
Creator: NVD / NIST
Published: 2018-07-25T14:29:00.383+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 0.78%

Last modified Jun 17, 2026

CVE-2018-5538 is a vulnerability of currently unknown severity. On F5 BIG-IP DNS 13.1.0-13.1.0.7, 12.1.3-12.1.3.5, DNS Express / DNS Zones accept NOTIFY messages on the management interface from source IP addresses not listed in the 'Allow NOTIFY From' configuration parameter when the db variable "dnsexpress.notifyport" is set to any value other than the default of "0".. EPSS estimates a 0.78% chance of exploitation in the next 30 days.

Description

On F5 BIG-IP DNS 13.1.0-13.1.0.7, 12.1.3-12.1.3.5, DNS Express / DNS Zones accept NOTIFY messages on the management interface from source IP addresses not listed in the 'Allow NOTIFY From' configuration parameter when the db variable "dnsexpress.notifyport" is set to any value other than the default of "0".

Metrics

EPSS Probability

0.78%

51.3th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
F5	Big-Ip Domain Name System	>= 12.1.3, <= 12.1.3.5
F5	Big-Ip Domain Name System	> 13.1.0, <= 13.1.0.7
F5	Big-Ip Global Traffic Manager	>= 12.1.3, <= 12.1.3.5
F5	Big-Ip Global Traffic Manager	>= 13.1.0, <= 13.1.0.7
F5	Big-Ip Local Traffic Manager	>= 12.1.3, <= 12.1.3.5
F5	Big-Ip Local Traffic Manager	>= 13.1.0, <= 13.1.0.7
F5	Big-Ip Link Controller	>= 12.1.3, <= 12.1.3.5
F5	Big-Ip Link Controller	>= 13.1.0, <= 13.1.0.7

References

https://support.f5.com/csp/article/K45435121Mitigation, Vendor Advisory
https://support.f5.com/csp/article/K45435121Mitigation, Vendor Advisory

Timeline

Published: Jul 25, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-5538?

How severe is CVE-2018-5538?

Severity scoring for CVE-2018-5538 is pending analysis. The EPSS model estimates a 0.78% probability of exploitation in the next 30 days.

How do I fix CVE-2018-5538?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-5538?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST