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CVE-2021-22981

MEDIUM
4.8
CVSS Score
Published: February 12, 2021 at 05:50 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
MEDIUM4.8
Exploit prediction
EPSS 0.6%

Description

On all versions of BIG-IP 12.1.x and 11.6.x, the original TLS protocol includes a weakness in the master secret negotiation that is mitigated by the Extended Master Secret (EMS) extension defined in RFC 7627. TLS connections that do not use EMS are vulnerable to man-in-the-middle attacks during renegotiation. 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%
11.6.1 ≤ v ≤ 11.6.512.1.0 ≤ v ≤ 12.1.5
Big IP Advanced Firewall Manager· F5
95%
11.6.1 ≤ v ≤ 11.6.512.1.0 ≤ v ≤ 12.1.5
Big IP Advanced Web Application Firewall· F5
95%
11.6.1 ≤ v ≤ 11.6.512.1.0 ≤ v ≤ 12.1.5
Big IP Analytics· F5
95%
11.6.1 ≤ v ≤ 11.6.512.1.0 ≤ v ≤ 12.1.5
Big IP Application Acceleration Manager· F5
95%
11.6.1 ≤ v ≤ 11.6.512.1.0 ≤ v ≤ 12.1.5
Big IP Application Security Manager· F5
95%
11.6.1 ≤ v ≤ 11.6.512.1.0 ≤ v ≤ 12.1.5
Big IP Ddos Hybrid Defender· F5
95%
11.6.1 ≤ v ≤ 11.6.512.1.0 ≤ v ≤ 12.1.5
Big IP Domain Name System· F5
95%
11.6.1 ≤ v ≤ 11.6.512.1.0 ≤ v ≤ 12.1.5
Big IP Fraud Protection Service· F5
95%
11.6.1 ≤ v ≤ 11.6.512.1.0 ≤ v ≤ 12.1.5
Big IP Global Traffic Manager· F5
95%
11.6.1 ≤ v ≤ 11.6.512.1.0 ≤ v ≤ 12.1.5

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/K09121542

CVSS

4.8MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
HIGH
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
NVD-CWE-noinfo

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