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F5 Networks BIG-IP : iControl REST and tmsh vulnerability (K000161022)

high Nessus Plugin ID 316100

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 17.1.3.2 / 17.5.1.6 / 21.0.0.2. It is, therefore, affected by a vulnerability as referenced in the K000161022 advisory.

 Incorrect permission assignment vulnerabilities exist in BIG-IP and BIG-IQ TMOS Shell (tmsh) network diagnostics commands and in BIG-IP iControl REST. These vulnerabilities may allow an authenticated attacker to view the network status of destination systems.(CVE-2026-41959)

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 K000161022.

See Also

https://my.f5.com/manage/s/article/K000161022

Plugin Details

Severity: High

ID: 316100

File Name: f5_bigip_SOL000161022.nasl

Version: 1.1

Type: Local

Published: 5/21/2026

Updated: 5/21/2026

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 4.6

Temporal Score: 3.4

Vector: CVSS2#AV:L/AC:L/Au:S/C:C/I:N/A:N

CVSS Score Source: CVE-2026-41959

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 5.7

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS v4

Risk Factor: High

Base Score: 7.1

Threat Score: 4.9

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Vulnerability Information

CPE: cpe:/a:f5:big-ip_application_security_manager, 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

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: 5/13/2026

Vulnerability Publication Date: 5/13/2026

Reference Information

CVE: CVE-2026-41959