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Fencer Intel
critical 9.6

CVE-2020-5948 json

On BIG-IP versions 16.0.0-16.0.0.1, 15.1.0-15.1.0.5, 14.1.0-14.1.2.7, 13.1.0-13.1.3.4, 12.1.0-12.1.5.2, and 11.6.1-11.6.5.2, undisclosed en…

published 5y ago modified 4mo ago also EUVD-2020-27102

cvss
9.6
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.0%
EPSS 1.0% chance of exploitation in 30 days, percentile 63%
public exploits
0
none known

Summary

On BIG-IP versions 16.0.0-16.0.0.1, 15.1.0-15.1.0.5, 14.1.0-14.1.2.7, 13.1.0-13.1.3.4, 12.1.0-12.1.5.2, and 11.6.1-11.6.5.2, undisclosed endpoints in iControl REST allow for a reflected XSS attack, which could lead to a complete compromise of the BIG-IP system if the victim user is granted the admin role.

Patch / fix

  • f5 big-ip_access_policy_manager 13.1.3.5, 14.1.2.8, 15.1.1
  • f5 big-ip_advanced_firewall_manager 13.1.3.5, 14.1.2.8, 15.1.1
  • f5 big-ip_analytics 13.1.3.5, 14.1.2.8, 15.1.1
  • f5 big-ip_application_acceleration_manager 13.1.3.5, 14.1.2.8, 15.1.1
  • f5 big-ip_application_security_manager 13.1.3.5, 14.1.2.8, 15.1.1
  • f5 big-ip_domain_name_system 13.1.3.5, 14.1.2.8, 15.1.1
  • f5 big-ip_fraud_protection_service 13.1.3.5, 14.1.2.8, 15.1.1
  • f5 big-ip_global_traffic_manager 13.1.3.5, 14.1.2.8, 15.1.1
  • f5 big-ip_link_controller 13.1.3.5, 14.1.2.8, 15.1.1
  • f5 big-ip_local_traffic_manager 13.1.3.5, 14.1.2.8, 15.1.1
  • f5 big-ip_policy_enforcement_manager 13.1.3.5, 14.1.2.8, 15.1.1

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Exploit prediction

1.03% chance of exploitation in the next 30 days, higher than 63% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 9.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Affected products

  • n/a BIG-IP

Classification

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

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.