F5 BIG-IP/BIG-IQ prior 17.1.3.2/17.5.1.6/21.0.0.2 privilege defined with unsafe actions

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.6$0-$5k0.00

Summaryinfo

A vulnerability was found in F5 BIG-IP and BIG-IQ. It has been classified as problematic. This affects an unknown function. This manipulation causes privilege defined with unsafe actions. This vulnerability appears as CVE-2026-42406. The attack may be initiated remotely. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability has been found in F5 BIG-IP and BIG-IQ and classified as problematic. Affected by this vulnerability is an unknown code block. The manipulation with an unknown input leads to a privilege defined with unsafe actions vulnerability. The CWE definition for the vulnerability is CWE-267. A particular privilege, role, capability, or right can be used to perform unsafe actions that were not intended, even when it is assigned to the correct entity. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

A vulnerability exists in BIG-IP and BIG-IQ systems where a highly privileged, authenticated attacker with at least the Certificate Manager role can modify configuration objects that allow running arbitrary commands.     Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

The advisory is shared at my.f5.com. This vulnerability is known as CVE-2026-42406 since 05/01/2026. The exploitation appears to be easy. The attack can be launched remotely. Additional levels of successful authentication are necessary for exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 06/23/2026). MITRE ATT&CK project uses the attack technique T1068 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 316101 (F5 Networks BIG-IP : BIG-IP and BIG-IQ privilege escalation vulnerability (K000160971)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 17.1.3.2, 17.5.1.6 or 21.0.0.2 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (316101) and CERT Bund (WID-SEC-2026-1532). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Affected

  • F5 BIG-IP

Productinfo

Type

Vendor

Name

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 6.7
VulDB Meta Temp Score: 6.6

VulDB Base Score: 4.7
VulDB Temp Score: 4.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 8.7
CNA Vector: 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Privilege defined with unsafe actions
CWE: CWE-267 / CWE-266
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 316101
Nessus Name: F5 Networks BIG-IP : BIG-IP and BIG-IQ privilege escalation vulnerability (K000160971)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: BIG-IP/BIG-IQ 17.1.3.2/17.5.1.6/21.0.0.2

Timelineinfo

05/01/2026 CVE reserved
05/13/2026 +12 days Advisory disclosed
05/13/2026 +0 days VulDB entry created
06/23/2026 +41 days VulDB entry last update

Sourcesinfo

Vendor: f5.com

Advisory: K000160971
Status: Confirmed

CVE: CVE-2026-42406 (🔒)
GCVE (CVE): GCVE-0-2026-42406
GCVE (VulDB): GCVE-100-363613
CERT Bund: WID-SEC-2026-1532 - F5 BIG-IP Produkte: Mehrere Schwachstellen

Entryinfo

Created: 05/13/2026 18:13
Updated: 06/23/2026 18:06
Changes: 05/13/2026 18:13 (74), 05/17/2026 16:33 (7), 05/24/2026 23:39 (2), 06/23/2026 18:06 (4)
Complete: 🔍
Cache ID: 216::103

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