What’s Vulnerable › Vulnerabilities

CVE-2018-5501

• Severity: medium (CVSS 5.9 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2018-03-01 · updated 2026-06-17
• Weakness: CWE-400

Description

In some circumstances, on F5 BIG-IP systems running 13.0.0, 12.1.0 - 12.1.3.1, any 11.6.x or 11.5.x release, or 11.2.1, TCP DNS profile allows excessive buffering due to lack of flow control.

Affected products

• F5 BIG-IP APM: from 11.5.1 through 11.5.4; from 11.6.1 through 11.6.2; from 12.1.0 through 12.1.3; 11.2.1, 13.0.0
• BIG-IP: from 11.5.1 through 11.5.4; from 11.6.1 through 11.6.2; from 12.1.0 through 12.1.3; 11.2.1, 13.0.0
• F5 Big-Ip Analytics: from 11.5.1 through 11.5.4; from 11.6.1 through 11.6.2; from 12.1.0 through 12.1.3; 11.2.1, 13.0.0
• F5 Networks, Inc. BIG-IP (AAM): from 11.5.1 through 11.5.4; from 11.6.1 through 11.6.2; from 12.1.0 through 12.1.3; 11.2.1, 13.0.0
• BIG-IP ASM: from 11.5.1 through 11.5.4; from 11.6.1 through 11.6.2; from 12.1.0 through 12.1.3; 11.2.1, 13.0.0
• F5 Networks, Inc. BIG-IP (DNS): from 11.5.1 through 11.5.4; from 11.6.1 through 11.6.2; from 12.1.0 through 12.1.3; 11.2.1, 13.0.0
• F5 Big-Ip Edge Gateway: from 11.5.1 through 11.5.4; from 11.6.1 through 11.6.2; from 12.1.0 through 12.1.3; 11.2.1, 13.0.0
• F5 Big-Ip Global Traffic Manager: from 11.5.1 through 11.5.4; from 11.6.1 through 11.6.2; from 12.1.0 through 12.1.3; 11.2.1, 13.0.0
• F5 Big-Ip Link Controller: from 11.5.1 through 11.5.4; from 11.6.1 through 11.6.2; from 12.1.0 through 12.1.3; 11.2.1, 13.0.0
• F5 BIG-IP (LTM): from 11.5.1 through 11.5.4; from 11.6.1 through 11.6.2; from 12.1.0 through 12.1.3; 11.2.1, 13.0.0
• F5 Networks, Inc. BIG-IP (PEM): from 11.5.1 through 11.5.4; from 11.6.1 through 11.6.2; from 12.1.0 through 12.1.3; 11.2.1, 13.0.0
• F5 Big-Ip Webaccelerator: from 11.5.1 through 11.5.4; from 11.6.1 through 11.6.2; from 12.1.0 through 12.1.3; 11.2.1, 13.0.0
• F5 Big-Ip Websafe: from 11.5.1 through 11.5.4; from 11.6.1 through 11.6.2; from 12.1.0 through 12.1.3; 11.2.1, 13.0.0

References

• http://www.securityfocus.com/bid/103211
• https://support.f5.com/csp/article/K44200194
• http://www.securityfocus.com/bid/103211
• https://support.f5.com/csp/article/K44200194

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