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CVE-2020-5871

HIGHCVSS 7.5/10EPSS 1.04%

Last modified

CVE-2020-5871 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 1.04% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability
1.04%

59.8th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

VendorProductVersions
F5Big-Ip Access Policy Manager>= 14.1.0, <= 14.1.2.3
F5Big-Ip Advanced Firewall Manager>= 14.1.0, <= 14.1.2.3
F5Big-Ip Analytics>= 14.1.0, <= 14.1.2.3
F5Big-Ip Application Acceleration Manager>= 14.1.0, <= 14.1.2.3
F5Big-Ip Application Security Manager>= 14.1.0, <= 14.1.2.3
F5Big-Ip Domain Name System>= 14.1.0, <= 14.1.2.3
F5Big-Ip Fraud Protection Service>= 14.1.0, <= 14.1.2.3
F5Big-Ip Global Traffic Manager>= 14.1.0, <= 14.1.2.3
F5Big-Ip Link Controller>= 14.1.0, <= 14.1.2.3
F5Big-Ip Local Traffic Manager>= 14.1.0, <= 14.1.2.3
F5Big-Ip Policy Enforcement Manager>= 14.1.0, <= 14.1.2.3

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2020-5871?
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.
How severe is CVE-2020-5871?
CVE-2020-5871 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.04% probability of exploitation in the next 30 days.
How do I fix CVE-2020-5871?
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-2020-5871?

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

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Source: NVD / NIST