CVE-2026-39455

HIGH

BIG-IP 21.1.0+ 21.0.0-21.0.0.1 17.5.0-17.5.1.5 17.1.0-17.1.3.1 16.1.0 - Denial of Service via LDAP Authentication

Title source: llm
STIX 2.1

Description

When the BIG-IP Configuration utility is configured to use Lightweight Directory Access Protocol (LDAP) authentication, undisclosed traffic can cause the httpd process to exhaust the available file descriptors.  Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

References (1)

Core 1
Core References
Vendor Advisory vendor-advisory patch
https://my.f5.com/manage/s/article/K000160874

Scores

CVSS v3 7.5
EPSS 0.0010
EPSS Percentile 28.1%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-772
Status published
Products (5)
F5/BIG-IP 16.1.0
F5/BIG-IP 17.1.0 - 17.1.3.2
F5/BIG-IP 17.5.0 - 17.5.1.6
F5/BIG-IP 21.0.0 - 21.0.0.2
F5/BIG-IP 21.1.0
Published May 13, 2026
Tracked Since May 13, 2026