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Fencer Intel
high 7.5

CVE-2018-5509 json

On F5 BIG-IP versions 13.0.0 or 12.1.0 - 12.1.3.1, when a specifically configured virtual server receives traffic of an undisclosed nature,…

published 2018-03-22 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-17278

cvss
7.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.8%
EPSS 2.8% chance of exploitation in 30 days, percentile 86%
public exploits
0
none known

Summary

On F5 BIG-IP versions 13.0.0 or 12.1.0 - 12.1.3.1, when a specifically configured virtual server receives traffic of an undisclosed nature, TMM will crash and take the configured failover action, potentially causing a denial of service. The configuration which exposes this issue is not common and in general does not work when enabled in previous versions of BIG-IP. Starting in 12.1.0, BIG-IP will crash if the configuration which exposes this issue is enabled and the virtual server receives non TCP traffic. With the fix of this issue, additional configuration validation logic has been added to prevent this configuration from being applied to a virtual server. There is only data plane exposure to this issue with a non-standard configuration. There is no control plane exposure.

Patch / fix

  • f5 big-ip_access_policy_manager 12.1.3.2, 13.1.0.4
  • f5 big-ip_advanced_firewall_manager 12.1.3.2, 13.1.0.4
  • f5 big-ip_application_acceleration_manager 12.1.3.2, 13.1.0.4
  • f5 big-ip_application_security_manager 12.3.1.2, 13.1.0.4
  • f5 big-ip_link_controller 12.1.3.2, 13.1.0.4
  • f5 big-ip_local_traffic_manager 12.1.3.2, 13.1.0.4
  • f5 big-ip_policy_enforcement_manager 12.1.3.2, 13.1.0.4

Exploit prediction

2.76% chance of exploitation in the next 30 days, higher than 86% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 7.8 AV:N/AC:L/Au:N/C:N/I:N/A:C

Affected products

  • F5 Networks, Inc. BIG-IP (LTM, AAM, AFM, APM, ASM, Link Controller, PEM, WebSafe)

Classification

Weakness
  • CWE-20 Improper Input Validation

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.