CVE-2023-20275
MediumCVSS 4.1Exploitation Probability (EPSS)
Low risk34th percentile - higher than 34% of all known CVEs
Summary
A vulnerability in the AnyConnect SSL VPN feature of Cisco ASA and FTD could allow an authenticated, remote attacker to send packets with another VPN user's source IP address. This is due to improper validation of the packet's inner source IP after decryption.
Risk Assessment
An attacker could impersonate another VPN user, potentially leading to access control bypass or attacks on other systems.
Recommendation
Apply Cisco updates for ASA and FTD and monitor VPN traffic for unusual source addresses.
Other vulnerabilities in Cisco ASA
See all- CVE-2024-20384Medium
A vulnerability in the Network Service Group (NSG) feature of Cisco ASA and FTD could allow an unauthenticated, remote attacker to bypass a configured ACL and allow traffic that should be denied. This is due to a logic error when NSG ACLs are populated.
- CVE-2024-20341Medium
A vulnerability in the VPN web client services of Cisco ASA and FTD could allow an unauthenticated, remote attacker to conduct a cross-site scripting (XSS) attack against a browser accessing an affected device. This is due to improper validation of user-supplied input.
- CVE-2024-20297Medium
A vulnerability in the AnyConnect firewall for Cisco ASA and FTD could allow an unauthenticated, remote attacker to bypass a configured ACL and allow traffic that should have been denied. This is due to a logic error in populating group ACLs when an AnyConnect client establishes a new session.
- CVE-2021-1476Medium
A vulnerability in the CLI of Cisco ASA and FTD could allow an authenticated, local attacker to execute arbitrary commands on the underlying OS with root privileges. This is due to insufficient input validation of user-supplied commands.
Original NVD description (English source)
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.