CVE-2026-23809
Published: 04 March 2026
Summary
CVE-2026-23809 is a medium-severity Uncontrolled Resource Consumption (CWE-400) vulnerability in Arubanetworks Arubaos. Its CVSS base score is 5.4 (Medium).
Operationally, exploitation aligns with the MITRE ATT&CK technique Network Sniffing (T1040); ranked at the 9.5th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 AC-18 (Wireless Access) and AC-4 (Information Flow Enforcement).
Deeper analysis
CVE-2026-23809 involves a technique that adapts a known port-stealing method to Wi-Fi environments utilizing multiple BSSIDs. By exploiting the relationship between BSSIDs and their associated virtual ports, the vulnerability allows attackers to bypass inter-BSSID isolation controls. It affects Wi-Fi components in such configurations, as documented in the associated HPE advisory, and is linked to CWE-400 (Uncontrolled Resource Consumption). The vulnerability received a CVSS v3.1 base score of 5.4 (AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N) when published on 2026-03-04.
An attacker in the adjacent network (AV:A), requiring no privileges (PR:N) or user interaction (UI:N) and low attack complexity (AC:L), can exploit this to redirect and intercept a victim's network traffic. Successful exploitation enables eavesdropping, session hijacking, or denial of service, with low impacts on confidentiality and integrity but no availability disruption (C:L/I:L/A:N).
The HPE security advisory at https://support.hpesc/public/docDisplay?docId=hpesbnw05026en_us&docLocale=en_US provides further details on the vulnerability, including recommended mitigations for affected systems.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-9415
Vulnerability details
A technique has been identified that adapts a known port-stealing method to Wi-Fi environments that use multiple BSSIDs. By leveraging the relationship between BSSIDs and their associated virtual ports, an attacker could potentially bypass inter-BSSID isolation controls. Successful exploitation may…
more
enable an attacker to redirect and intercept the victim's network traffic, potentially resulting in eavesdropping, session hijacking, or denial of service.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Bypassing BSSID isolation enables network sniffing (T1040) and adversary-in-the-middle traffic interception/hijacking (T1557) on adjacent Wi-Fi networks.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly enforces inter-BSSID isolation policies to block unauthorized traffic redirection between virtual ports on the same wireless infrastructure.
Requires explicit authorization, configuration restrictions, and encryption for all wireless access, preventing exploitation of multi-BSSID port-stealing vectors.
Provides wireless link protection mechanisms that can limit traffic interception and session hijacking when inter-BSSID isolation is bypassed.