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CVE-2020-27718

HIGHCVSS 7.5/10EPSS 1.03%

Last modified

CVE-2020-27718 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. When a BIG-IP ASM or Advanced WAF system running version 16.0.0-16.0.0.1, 15.1.0-15.1.0.5, 14.1.0-14.1.3, 13.1.0-13.1.3.4, 12.1.0-12.1.5.2, or 11.6.1-11.6.5.2 processes requests with JSON payload, an unusually large number of parameters can cause excessive CPU usage in the BIG-IP ASM bd process.. EPSS estimates a 1.03% chance of exploitation in the next 30 days.

Description

When a BIG-IP ASM or Advanced WAF system running version 16.0.0-16.0.0.1, 15.1.0-15.1.0.5, 14.1.0-14.1.3, 13.1.0-13.1.3.4, 12.1.0-12.1.5.2, or 11.6.1-11.6.5.2 processes requests with JSON payload, an unusually large number of parameters can cause excessive CPU usage in the BIG-IP ASM bd process.

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
1.03%

59.4th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

VendorProductVersions
F5Big-Ip Advanced Web Application Firewall>= 11.6.1, <= 11.6.5
F5Big-Ip Advanced Web Application Firewall>= 12.1.0, <= 12.1.5
F5Big-Ip Advanced Web Application Firewall>= 13.1.0, < 13.1.3.5
F5Big-Ip Advanced Web Application Firewall>= 14.1.0, < 14.1.3.1
F5Big-Ip Advanced Web Application Firewall>= 15.0.0, < 15.1.1
F5Big-Ip Advanced Web Application Firewall>= 16.0.0, < 16.0.1
F5Big-Ip Application Security Manager>= 11.6.1, <= 11.6.5
F5Big-Ip Application Security Manager>= 12.1.0, <= 12.1.5
F5Big-Ip Application Security Manager>= 13.1.0, < 13.1.3.5
F5Big-Ip Application Security Manager>= 14.1.0, < 14.1.3.1
F5Big-Ip Application Security Manager>= 15.0.0, < 15.1.1
F5Big-Ip Application Security Manager>= 16.0.0, < 16.0.1

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2020-27718?
When a BIG-IP ASM or Advanced WAF system running version 16.0.0-16.0.0.1, 15.1.0-15.1.0.5, 14.1.0-14.1.3, 13.1.0-13.1.3.4, 12.1.0-12.1.5.2, or 11.6.1-11.6.5.2 processes requests with JSON payload, an unusually large number of parameters can cause excessive CPU usage in the BIG-IP ASM bd process.
How severe is CVE-2020-27718?
CVE-2020-27718 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.03% probability of exploitation in the next 30 days.
How do I fix CVE-2020-27718?
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-2020-27718?

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

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Source: NVD / NIST