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Fencer Vulns
high 7.5

CVE-2021-22977 json

On BIG-IP version 16.0.0-16.0.1 and 14.1.2.4-14.1.3, cooperation between malicious HTTP client code and a malicious server may cause TMM to…

published 2021-02-12 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-10095

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.1%
EPSS 1.1% chance of exploitation in 30 days, percentile 65%
public exploits
0
none known

Summary

On BIG-IP version 16.0.0-16.0.1 and 14.1.2.4-14.1.3, cooperation between malicious HTTP client code and a malicious server may cause TMM to restart and generate a core file. Note: Software versions which have reached End of Software Development (EoSD) are not evaluated.

Patch / fix

  • f5 big-ip_access_policy_manager 14.1.3.1, 16.0.1.1
  • f5 big-ip_advanced_firewall_manager 14.1.3.1, 16.0.1.1
  • f5 big-ip_advanced_web_application_firewall 14.1.3.1, 16.0.1.1
  • f5 big-ip_analytics 14.1.3.1, 16.0.1.1
  • f5 big-ip_application_acceleration_manager 14.1.3.1, 16.0.1.1
  • f5 big-ip_application_security_manager 14.1.3.1, 16.0.1.1
  • f5 big-ip_ddos_hybrid_defender 14.1.3.1, 16.0.1.1
  • f5 big-ip_domain_name_system 14.1.3.1, 16.0.1.1
  • f5 big-ip_fraud_protection_service 14.1.3.1, 16.0.1.1
  • f5 big-ip_global_traffic_manager 14.1.3.1, 16.0.1.1
  • f5 big-ip_link_controller 14.1.3.1, 16.0.1.1
  • f5 big-ip_local_traffic_manager 14.1.3.1, 16.0.1.1
  • f5 big-ip_policy_enforcement_manager 14.1.3.1, 16.0.1.1
  • f5 big-ip_ssl_orchestrator 14.1.3.1, 16.0.1.1

Exploit prediction

1.07% chance of exploitation in the next 30 days, higher than 65% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

  • n/a BIG-IP

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.