CVE-2020-27718

HIGH

7.5

CVSS Score

Published: December 24, 2020 at 02:57 PM UTC

Updated: June 17, 2026 at 03:09 AM UTC

2 products affected across 1 vendorBig IP Application Security ManagerBig IP Advanced Web Application Firewall

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Severity

HIGH7.5

Exploit prediction

EPSS 1%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Big IP Advanced Web Application Firewall · F5

95%

11.6.1 ≤ v ≤ 11.6.512.1.0 ≤ v ≤ 12.1.513.1.0 ≤ v < 13.1.3.514.1.0 ≤ v < 14.1.3.115.0.0 ≤ v < 15.1.116.0.0 ≤ v < 16.0.111.6.1-11.6.5.2 12.1.0-12.1.5.2 13.1.0-13.1.3.4 14.1.0-14.1.3 15.1.0-15.1.0.5 16.0.0-16.0.0.1

Affected range stops below 13.1.3.5, so it looks safe — our inference, not a vendor statement

Affected range stops below 14.1.3.1, so it looks safe — our inference, not a vendor statement

Affected range stops below 15.1.1, so it looks safe — our inference, not a vendor statement

Affected range stops below 16.0.1, so it looks safe — our inference, not a vendor statement

Big IP Application Security Manager · F5

95%

Affected range stops below 13.1.3.5, so it looks safe — our inference, not a vendor statement

Affected range stops below 14.1.3.1, so it looks safe — our inference, not a vendor statement

Affected range stops below 15.1.1, so it looks safe — our inference, not a vendor statement

Affected range stops below 16.0.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://support.f5.com/csp/article/K58102101

References (1)

x_refsource_MISCVendor Advisory

Source: [email protected]

https://support.f5.com/csp/article/K58102101

CVSS

7.5HIGH[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: NONE
Availability: HIGH

Vector?

Quick Info

StatusMODIFIED

CWE

NVD-CWE-noinfo

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