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Fencer Vulns
medium 6.1

CVE-2021-23041 json

On BIG-IP version 16.0.x before 16.0.1.2, 15.1.x before 15.1.3, 14.1.x before 14.1.4.2, 13.1.x before 13.1.4.1, and all versions of 12.1.x,…

published 2021-09-14 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-10159

cvss
6.1
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 48%
public exploits
0
none known

Summary

On BIG-IP version 16.0.x before 16.0.1.2, 15.1.x before 15.1.3, 14.1.x before 14.1.4.2, 13.1.x before 13.1.4.1, and all versions of 12.1.x, a DOM based cross-site scripting (XSS) vulnerability exists in an undisclosed page of the BIG-IP Configuration utility that allows an attacker to execute JavaScript in the context of the current logged-in user. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Patch / fix

  • f5 big-ip_access_policy_manager 13.1.4.1, 14.1.4.2, 15.1.3, 16.0.1.2
  • f5 big-ip_advanced_firewall_manager 13.1.4.1, 14.1.4.2, 15.1.3, 16.0.1.2
  • f5 big-ip_advanced_web_application_firewall 13.1.4.1, 14.1.4.2, 15.1.3, 16.0.1.2
  • f5 big-ip_analytics 13.1.4.1, 14.1.4.2, 15.1.3, 16.0.1.2
  • f5 big-ip_application_acceleration_manager 13.1.4.1, 14.1.4.2, 15.1.3, 16.0.1.2
  • f5 big-ip_application_security_manager 13.1.4.1, 14.1.4.2, 15.1.3, 16.0.1.2
  • f5 big-ip_domain_name_system 13.1.4.1, 14.1.4.2, 15.1.3, 16.0.1.2
  • f5 big-ip_fraud_protection_service 13.1.4.1, 14.1.4.2, 15.1.3, 16.0.1.2
  • f5 big-ip_global_traffic_manager 13.1.4.1, 14.1.4.2, 15.1.3, 16.0.1.2
  • f5 big-ip_link_controller 13.1.4.1, 14.1.4.2, 15.1.3, 16.0.1.2
  • f5 big-ip_local_traffic_manager 13.1.4.1, 14.1.4.2, 15.1.3, 16.0.1.2

Exploit prediction

0.58% chance of exploitation in the next 30 days, higher than 48% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N

Affected products

  • n/a BIG-IP

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation

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.