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CVE-2021-23000

HIGH
7.5
CVSS Score
Published: March 31, 2021 at 05:26 PM UTC
Updated: June 17, 2026 at 03:38 AM UTC
15 products affected across 1 vendorBig IP Access Policy ManagerBig IP Application Security ManagerBig IP Advanced Firewall Manager

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Severity
HIGH7.5
Exploit prediction
EPSS 1.0%

Description

On BIG-IP versions 13.1.3.4-13.1.3.6 and 12.1.5.2, if the tmm.http.rfc.enforcement BigDB key is enabled in a BIG-IP system, or the Bad host header value is checked in the AFM HTTP security profile associated with a virtual server, in rare instances, a specific sequence of malicious requests may cause TMM to restart. Note: Software versions which have reached End of Software Development (EoSD) are not evaluated.

Affected

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

Big IP Access Policy Manager· F5
95%
13.1.3.4 ≤ v < 13.1.3.612.1.5.2
Affected range stops below 13.1.3.6, so it looks safe — our inference, not a vendor statement
Big IP Advanced Firewall Manager· F5
95%
13.1.3.4 ≤ v < 13.1.3.612.1.5.2
Affected range stops below 13.1.3.6, so it looks safe — our inference, not a vendor statement
Big IP Advanced Web Application Firewall· F5
95%
13.1.3.4 ≤ v < 13.1.3.612.1.5.2
Affected range stops below 13.1.3.6, so it looks safe — our inference, not a vendor statement
Big IP Analytics· F5
95%
13.1.3.4 ≤ v < 13.1.3.612.1.5.2
Affected range stops below 13.1.3.6, so it looks safe — our inference, not a vendor statement
Big IP Application Acceleration Manager· F5
95%
13.1.3.4 ≤ v < 13.1.3.612.1.5.2
Affected range stops below 13.1.3.6, so it looks safe — our inference, not a vendor statement
Big IP Application Security Manager· F5
95%
13.1.3.4 ≤ v < 13.1.3.612.1.5.2
Affected range stops below 13.1.3.6, so it looks safe — our inference, not a vendor statement
Big IP Ddos Hybrid Defender· F5
95%
13.1.3.4 ≤ v < 13.1.3.612.1.5.2
Affected range stops below 13.1.3.6, so it looks safe — our inference, not a vendor statement
Big IP Domain Name System· F5
95%
13.1.3.4 ≤ v < 13.1.3.612.1.5.2
Affected range stops below 13.1.3.6, so it looks safe — our inference, not a vendor statement
Big IP Fraud Protection Service· F5
95%
13.1.3.4 ≤ v < 13.1.3.612.1.5.2
Affected range stops below 13.1.3.6, so it looks safe — our inference, not a vendor statement
Big IP Global Traffic Manager· F5
95%
13.1.3.4 ≤ v < 13.1.3.612.1.5.2
Affected range stops below 13.1.3.6, 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

References (1)

x_refsource_MISCVendor Advisory
Source: [email protected]
https://support.f5.com/csp/article/K34441555

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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