CVE intelligence and bounded remediation

CVE-2021-22981 — F5 Big-Ip Access Policy Manager security vulnerability

Medium CVSS 5.8

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.

Severity
Medium
CVSS
5.8 (2.0)
Published
2021-02-12
CISA KEV
Not currently listed
Ecosystem
software/application

Affected products

  • f5 / big-ip_access_policy_manager
  • f5 / big-ip_advanced_firewall_manager
  • f5 / big-ip_advanced_web_application_firewall
  • f5 / big-ip_analytics
  • f5 / big-ip_application_acceleration_manager
  • f5 / big-ip_application_security_manager

Showing 6 representative product identities from 28 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

Matched remediation archetype

General vulnerability remediation

This catalog composition supplies bounded fallback guidance. Explicitly reviewed curated workflows load with the complete record below.

Check exposure

  • Confirm the affected component, deployment paths, reachable interfaces, and enabled features from inventories and configuration, without probing production destructively.
  • Compare the advisory's affected conditions with the repository lockfiles, build manifests, artifacts, and runtime inventory.
  • Identify data sensitivity, trust boundaries, and privilege level for every confirmed affected deployment.

Remediate safely

  • Apply a vendor-supported fix or remove the affected component or feature; record the selected change and its source in the repository.
  • Update direct and transitive dependency locks, generated artifacts, deployment manifests, and asset inventories together.
  • Add a regression test for the documented unsafe condition using inert inputs and preserve rollback instructions.

Authoritative sources

Complete CVE record and remediation plan

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