F5 Networks BIG-IP : BIG-IP SMTP configuration security exposure (K000156643)

high Nessus Plugin ID 298037

Language:

Synopsis

The remote device is missing a vendor-supplied security patch.

Description

The version of F5 Networks BIG-IP installed on the remote host is prior to 17.1.3.1 / 17.5.1.4 / 21.0.0.1. It is, therefore, affected by a vulnerability as referenced in the K000156643 advisory.

An authenticated attacker granted the guest role on a BIG-IP system can modify theSMTP Server Host Nameas well as theSMTP Server Port Numbersettings and run the Test Connection feature.This issue occurs when the following condition is met:The affected BIG-IP system is configured to send mail through an SMTP server and has an existing SMTP configuration on theSystem>Configuration>Device>SMTPpage.Note: The guest role does not have the permissions to create a new SMTP configuration on the BIG-IP system.

Tenable has extracted the preceding description block directly from the F5 Networks BIG-IP security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade to one of the non-vulnerable versions listed in the F5 Solution K000156643.

Plugin Details

Severity: High

ID: 298037

File Name: f5_bigip_SOL000156643.nasl

Version: 1.2

Type: local

Family: F5 Networks Local Security Checks

Published: 2/5/2026

Updated: 2/5/2026

Supported Sensors: Nessus

Vulnerability Information

CPE: cpe:/a:f5:big-ip_irules_lx, cpe:/h:f5:big-ip_protocol_security_manager, cpe:/a:f5:big-ip_domain_name_system, cpe:/a:f5:big-ip_ssl_orchestrator, cpe:/a:f5:big-ip_policy_enforcement_manager, cpe:/a:f5:big-ip_wan_optimization_manager, cpe:/h:f5:big-ip, cpe:/a:f5:big-ip_iapps_lx, cpe:/a:f5:big-ip_advanced_firewall_manager, cpe:/a:f5:big-ip_local_traffic_manager, cpe:/a:f5:big-ip_access_policy_manager, cpe:/a:f5:big-ip_global_traffic_manager, cpe:/a:f5:big-ip_application_security_manager

Required KB Items: Host/local_checks_enabled, Host/BIG-IP/hotfix, Host/BIG-IP/modules, Host/BIG-IP/version

Exploit Ease: No known exploits are available

Patch Publication Date: 2/4/2026

Vulnerability Publication Date: 2/4/2026

Detections

Analytics