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Fencer Intel
high 7.5

CVE-2018-5502 json

On F5 BIG-IP versions 13.0.0 - 13.1.0.3, attackers may be able to disrupt services on the BIG-IP system with maliciously crafted client cer…

published 2018-03-22 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-17271

cvss
7.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.3%
EPSS 1.3% chance of exploitation in 30 days, percentile 71%
public exploits
0
none known

Summary

On F5 BIG-IP versions 13.0.0 - 13.1.0.3, attackers may be able to disrupt services on the BIG-IP system with maliciously crafted client certificate. This vulnerability affects virtual servers associated with Client SSL profile which enables the use of client certificate authentication. Client certificate authentication is not enabled by default in Client SSL profile. There is no control plane exposure.

Patch / fix

  • f5 big-ip_access_policy_manager 13.1.0.4
  • f5 big-ip_advanced_firewall_manager 13.1.0.4
  • f5 big-ip_analytics 13.1.0.4
  • f5 big-ip_application_acceleration_manager 13.1.0.4
  • f5 big-ip_application_security_manager 13.1.0.4
  • f5 big-ip_edge_gateway 13.1.0.4
  • f5 big-ip_global_traffic_manager 13.1.0.4
  • f5 big-ip_link_controller 13.1.0.4
  • f5 big-ip_local_traffic_manager 13.1.0.4
  • f5 big-ip_policy_enforcement_manager 13.1.0.4
  • f5 big-ip_webaccelerator 13.1.0.4

Exploit prediction

1.32% chance of exploitation in the next 30 days, higher than 71% 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 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

  • F5 Networks, Inc. BIG-IP (LTM, AAM, AFM, Analytics, APM, ASM, DNS, Edge Gateway, GTM, Link Controller, PEM, WebAccelerator, WebSafe)

Classification

Weakness
  • CWE-295 Improper Certificate 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.