A vulnerability in the AnyConnect SSL VPN feature of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an authenticated, remote attacker to send packets with another VPN user's source IP address. This vulnerability is due to improper validation of the packet's inner source IP address after decryption. An attacker could exploit this vulnerability by sending crafted packets through the tunnel. A successful exploit could allow the attacker to send a packet impersonating another VPN user's IP address. It is not possible for the attacker to receive return packets.

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Detections

Analytics

Cisco ASA Origin Validation Error (CVE-2023-20275)

medium Tenable OT Security Plugin ID 506156

Version 1.2

Version 1.1

Version 1.2 Oct 7, 2026, 3:19 PM CVSS metrics ("CVSSv2 score" set to 4.0) CVSS metrics ("CVSSv2 vector" set to "CVSS2#AV:N/AC:L/Au:S/C:N/I:P/A:N") CVSS temporal metrics ("CVSSv2 temporal vector" set to "CVSS2#E:U/RL:OF/RC:C") CVSS temporal metrics ("CVSSv3 temporal vector" set to "CVSS:3.0/E:U/RL:O/RC:C") CVSSv2 severity (based on CVE-2023-20275, severity decreased from "High" to "Medium") Exploit attributes ("Exploit available" set to "False") Exploit attributes ("Exploitability ease" set to "No known exploits are available") Plugin Feed: 202610071519
Version 1.1 Oct 6, 2026, 1:47 PM New Plugin Feed: 202610061347