What’s Vulnerable › Vulnerabilities

CVE-2020-5871

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-04-30 · updated 2026-06-17

Description

On BIG-IP 14.1.0-14.1.2.3, undisclosed requests can lead to a denial of service (DoS) when sent to BIG-IP HTTP/2 virtual servers. The problem can occur when ciphers, which have been blacklisted by the HTTP/2 RFC, are used on backend servers. This is a data-plane issue. There is no control-plane exposure.

Affected products

• F5 BIG-IP APM: from 14.1.0 through 14.1.2.3
• BIG-IP: from 14.1.0 through 14.1.2.3
• F5 Big-Ip Analytics: from 14.1.0 through 14.1.2.3
• F5 Networks, Inc. BIG-IP (AAM): from 14.1.0 through 14.1.2.3
• BIG-IP ASM: from 14.1.0 through 14.1.2.3
• F5 BIG-IP DNS: from 14.1.0 through 14.1.2.3
• F5 Big-Ip Fraud Protection Service: from 14.1.0 through 14.1.2.3
• F5 Big-Ip Global Traffic Manager: from 14.1.0 through 14.1.2.3
• F5 Big-Ip Link Controller: from 14.1.0 through 14.1.2.3
• F5 BIG-IP (LTM): from 14.1.0 through 14.1.2.3
• F5 Networks, Inc. BIG-IP (PEM): from 14.1.0 through 14.1.2.3

References

• https://support.f5.com/csp/article/K43450419
• https://support.f5.com/csp/article/K43450419

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