Unauthorized Bi-Directional Traffic Interception via L2/L3 Manipulation

published 2026-03-04 8 mo ago modified 2026-06-17 4 mo ago also EUVD-2026-9417

cvss: 4.3; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 6%
public exploits: 0; none known

A vulnerability in the client isolation mechanism may allow an attacker to bypass Layer 2 (L2) communication restrictions between clients and redirect traffic at Layer 3 (L3). In addition to bypassing policy enforcement, successful exploitation - when combined with a port-stealing attack - may enable a bi-directional Machine-in-the-Middle (MitM) attack.

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 8 mo ago (2026-03-04)

Exploit prediction

0.17% chance of exploitation in the next 30 days, higher than 6% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	4.3	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
NVD	3.1	3.1	CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected products

Hewlett Packard Enterprise (HPE) HPE Aruba Networking Wireless Operating Systems (AOS-8 & AOS-10)

Classification

Weakness

CWE-300 Channel Accessible by Non-Endpoint

References

support.hpe.com /hpesc/public/docDisplay?docId=hpesbnw05026en_us&docLocale=en_US
vendor-advisory

Sources

CVE List CVE-2026-23811
NVD CVE-2026-23811

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Summary