CVE-2024-20355
MediumCVSS 5.0Exploitation Probability (EPSS)
Low risk26th percentile - higher than 26% of all known CVEs
Summary
A vulnerability in the implementation of SAML 2.0 single sign-on (SSO) for remote access VPN services in Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an authenticated, remote attacker to successfully establish a VPN session on an affected device. The issue is due to improper separation of authorization domains when using SAML authentication.
Risk Assessment
An attacker with valid credentials could use a SAML token to establish a VPN session with a connection profile they are not authorized to use, gaining access to secured networks behind the device that they are not authorized to access.
Recommendation
Apply Cisco updates for ASA and FTD. Regularly review tunnel group configurations and user permissions.
Other vulnerabilities in Cisco Adaptive Security Appliance (ASA) Software
See all- CVE-2016-1367High
The DHCPv6 relay implementation in Cisco Adaptive Security Appliance (ASA) Software 9.4.1 allows remote attackers to cause a denial of service (device reload) via crafted DHCPv6 packets.
- CVE-2015-0677High
The XML parser in Cisco Adaptive Security Appliance (ASA) Software before version 8.4(7.28), 8.6(1.17), 9.0(4.33), 9.1(6), 9.2(3.4), and 9.3(3) is vulnerable to an attack that can lead to denial of service via a crafted XML document. This attack can result in VPN outages or device reloads.
- CVE-2015-0676High
The DNS implementation in Cisco Adaptive Security Appliance (ASA) Software before versions 7.2(5.16), 8.2(5.57), 8.3(2.44), 8.4(7.28), 8.5(1.24), 8.6(1.17), 8.7(1.16), 9.0(4.33), 9.1(6.1), 9.2(3.4), and 9.3(3) is vulnerable to man-in-the-middle attacks that can lead to denial of service by triggering DNS queries and sending crafted responses.
- CVE-2015-0675High
The failover IPsec implementation in Cisco Adaptive Security Appliance (ASA) Software before version 9.1(6), 9.2(3.3), and 9.3(3) does not properly validate failover communication messages, allowing remote attackers to reconfigure an ASA device.
- CVE-2014-2129High
The SIP inspection engine in Cisco Adaptive Security Appliance (ASA) Software before versions 8.2(5.48), 8.4(6.5), 9.0(3.1), and 9.1(2.5) allows remote attackers to cause a denial of service via crafted SIP packets.
- CVE-2014-2127High
Cisco Adaptive Security Appliance (ASA) Software versions before 8.2(5.48), 8.3 before 8.3(2.40), 8.4 before 8.4(7.9), 8.6 before 8.6(1.13), 9.0 before 9.0(4.1), and 9.1 before 9.1(4.3) does not properly process management-session information during privilege validation for SSL VPN portal connections. This allows remote authenticated users to gain privileges by establishing a Clientless SSL VPN session and entering crafted URLs.
- CVE-2014-2126High
Cisco Adaptive Security Appliance (ASA) Software versions before 8.2(5.47), 8.4(7.5), 8.7(1.11), 9.0(3.10), and 9.1(3.4) allows remote authenticated users to gain privileges by leveraging level-0 ASDM access.
- CVE-2025-20182High
A vulnerability in the Internet Key Exchange version 2 (IKEv2) protocol processing of Cisco Adaptive Security Appliance (ASA) Software, Cisco Firepower Threat Defense (FTD) Software, Cisco IOS Software, and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The issue is due to insufficient input validation when processing IKEv2 messages. Sending crafted IKEv2 traffic can cause the device to reload, resulting in a DoS condition.
- CVE-2024-20426High
A vulnerability in the Internet Key Exchange version 2 (IKEv2) protocol for VPN termination of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The issue is due to insufficient input validation. Sending crafted IKEv2 traffic can cause the device to reload, resulting in a DoS condition.
- CVE-2024-20382Medium
A vulnerability in the VPN web client services feature of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to conduct a cross-site scripting (XSS) attack against a browser accessing an affected device. The issue is due to improper validation of user-supplied input to application endpoints.
Original NVD description (English source)
A vulnerability in the implementation of SAML 2.0 single sign-on (SSO) for remote access VPN services in Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an authenticated, remote attacker to successfully establish a VPN session on an affected device. This vulnerability is due to improper separation of authorization domains when using SAML authentication. An attacker could exploit this vulnerability by using valid credentials to successfully authenticate using their designated connection profile (tunnel group), intercepting the SAML SSO token that is sent back from the Cisco ASA device, and then submitting the same SAML SSO token to a different tunnel group for authentication. A successful exploit could allow the attacker to establish a remote access VPN session using a connection profile that they are not authorized to use and connect to secured networks behind the affected device that they are not authorized to access. For successful exploitation, the attacker must have valid remote access VPN user credentials.