CVE-2026-42937: CWE-732 Incorrect Permission Assignment for Critical Resource in F5 BIG-IP
Incorrect permission assignment vulnerabilities exist in BIG-IP and BIG-IQ TMOS Shell (tmsh) arp and ndp commands, and in BIG-IP iControl REST. These vulnerabilities may allow an authenticated attacker to view adjacent network information. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-42937) in F5 BIG-IP products arises from incorrect permission assignments (CWE-732) in the TMOS Shell arp and ndp commands and the BIG-IP iControl REST interface. Authenticated users with limited privileges may gain unauthorized read access to adjacent network information, potentially exposing sensitive network topology details. The CVSS v3.1 base score is 6.5, reflecting a medium severity with network attack vector, low attack complexity, and no user interaction required. The vulnerability does not impact integrity or availability, only confidentiality. Affected versions include 21.0.0, 17.5.0, 17.1.0, and 16.1.0. No patch or official remediation level has been published as of the data provided.
Potential Impact
An authenticated attacker with low privileges can exploit this vulnerability to view adjacent network information, which may aid in further reconnaissance or targeted attacks. The impact is limited to confidentiality; integrity and availability are not affected. There are no known exploits in the wild at this time.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no official fix or remediation level is provided, organizations should monitor F5's advisories for updates. Until a patch is available, restrict authenticated access to affected BIG-IP components to trusted users only.
CVE-2026-42937: CWE-732 Incorrect Permission Assignment for Critical Resource in F5 BIG-IP
Description
Incorrect permission assignment vulnerabilities exist in BIG-IP and BIG-IQ TMOS Shell (tmsh) arp and ndp commands, and in BIG-IP iControl REST. These vulnerabilities may allow an authenticated attacker to view adjacent network information. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-42937) in F5 BIG-IP products arises from incorrect permission assignments (CWE-732) in the TMOS Shell arp and ndp commands and the BIG-IP iControl REST interface. Authenticated users with limited privileges may gain unauthorized read access to adjacent network information, potentially exposing sensitive network topology details. The CVSS v3.1 base score is 6.5, reflecting a medium severity with network attack vector, low attack complexity, and no user interaction required. The vulnerability does not impact integrity or availability, only confidentiality. Affected versions include 21.0.0, 17.5.0, 17.1.0, and 16.1.0. No patch or official remediation level has been published as of the data provided.
Potential Impact
An authenticated attacker with low privileges can exploit this vulnerability to view adjacent network information, which may aid in further reconnaissance or targeted attacks. The impact is limited to confidentiality; integrity and availability are not affected. There are no known exploits in the wild at this time.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no official fix or remediation level is provided, organizations should monitor F5's advisories for updates. Until a patch is available, restrict authenticated access to affected BIG-IP components to trusted users only.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- f5
- Date Reserved
- 2026-04-30T23:04:20.019Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a049717cbff5d8610e0031b
Added to database: 5/13/2026, 3:21:59 PM
Last enriched: 5/13/2026, 3:38:46 PM
Last updated: 5/13/2026, 7:48:01 PM
Views: 5
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