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Fencer Intel
high 7.5

CVE-2020-5931 json

On BIG-IP 15.1.0-15.1.0.5, 14.1.0-14.1.2.3, 13.1.0-13.1.3.4, 12.1.0-12.1.5.2, and 11.6.1-11.6.5.2, Virtual servers with a OneConnect profil…

published 6y ago modified 4mo ago also EUVD-2020-27085

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.3%
EPSS 1.3% chance of exploitation in 30 days, percentile 70%
public exploits
0
none known

Summary

On BIG-IP 15.1.0-15.1.0.5, 14.1.0-14.1.2.3, 13.1.0-13.1.3.4, 12.1.0-12.1.5.2, and 11.6.1-11.6.5.2, Virtual servers with a OneConnect profile may incorrectly handle WebSockets related HTTP response headers, causing TMM to restart.

Patch / fix

  • f5 big-ip_access_policy_manager 14.1.2.5, 15.1.1
  • f5 big-ip_advanced_firewall_manager 14.1.2.5, 15.1.1
  • f5 big-ip_analytics 14.1.2.5, 15.1.1
  • f5 big-ip_application_acceleration_manager 14.1.2.5, 15.1.1
  • f5 big-ip_application_security_manager 14.1.2.5, 15.1.1
  • f5 big-ip_domain_name_system 14.1.2.5, 15.1.1
  • f5 big-ip_fraud_protection_service 14.1.2.5, 15.1.1
  • f5 big-ip_global_traffic_manager 14.1.2.5, 15.1.1
  • f5 big-ip_link_controller 14.1.2.5, 15.1.1
  • f5 big-ip_local_traffic_manager 14.1.2.5, 15.1.1
  • f5 big-ip_policy_enforcement_manager 14.1.2.5, 15.1.1

Is CVE-2020-5931 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Exploit prediction

1.28% chance of exploitation in the next 30 days, higher than 70% of all scored CVEs (FIRST EPSS, 2026-11-09).

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 Intel 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.