LDAP Authentication Vulnerability in F5 BIG-IP Configuration Utility
CVE-2026-39455

8.7HIGH

Key Information:

Vendor

F5
Status
Big-ip
Vendor
CVE Published:
13 May 2026

What is CVE-2026-39455?

The F5 BIG-IP Configuration Utility can experience a vulnerability when configured for Lightweight Directory Access Protocol (LDAP) authentication. In scenarios where certain undisclosed traffic patterns occur, the httpd process is susceptible to exhausting available file descriptors. This can lead to service disruptions and impact the functionality of the utility. It's crucial for organizations using affected versions to evaluate their configurations and implement necessary security measures.

Affected Version(s)

BIG-IP 21.0.0 < 21.0.0.2

BIG-IP 17.5.0 < 17.5.1.6

BIG-IP 17.1.0 < 17.1.3.2

References

https://my.f5.com/manage/s/article/K000160874
vendor-advisorypatch

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

F5
.