CVE-2024-20493
MediumCVSS 5.3Exploitation Probability (EPSS)
Low risk43th percentile - higher than 43% of all known CVEs
Summary
A vulnerability in the login authentication of the Remote Access SSL VPN feature of Cisco ASA and FTD Software could allow an unauthenticated, remote attacker to deny further VPN user authentications for several minutes, resulting in a temporary DoS. This is due to ineffective memory resource handling during authentication. An attacker could send crafted packets to cause resource exhaustion.
Risk Assessment
The attack could cause VPN service disruption, impacting remote work and access to corporate resources.
Recommendation
Install Cisco updates for ASA and FTD. Monitor network traffic for suspicious packets and consider restricting access to the SSL VPN feature.
Other vulnerabilities in Cisco ASA Software
See all- CVE-2016-6432High
A vulnerability in the Identity Firewall feature of Cisco ASA Software before version 9.6(2.1) could allow an unauthenticated, remote attacker to cause a reload of the affected system or to remotely execute code. The issue is due to a buffer overflow in the affected code area.
- CVE-2016-6431High
A vulnerability in the local Certificate Authority (CA) feature of Cisco ASA Software before version 9.6(1.5) could allow an unauthenticated, remote attacker to cause a reload of the affected system. The issue is due to improper handling of crafted packets during the enrollment operation.
- CVE-2014-3392High
The Clientless SSL VPN portal in Cisco ASA Software before version 8.2(5.51), 8.3(2.42), 8.4(7.23), 8.6(1.15), 9.0(4.24), 9.1(5.12), 9.2(2.8), and 9.3(1.1) allows remote attackers to obtain sensitive information from process memory or modify memory contents via crafted parameters.
- CVE-2014-3389High
The VPN implementation in Cisco ASA Software versions before 7.2(5.15), 8.2(5.51), 8.3(2.42), 8.4(7.23), 8.6(1.15), 9.0(4.24), 9.1(5.12), 9.2(2.6), and 9.3(1.1) does not properly implement a tunnel filter, allowing remote authenticated users to gain failover-unit access via crafted packets.
- CVE-2014-3388High
The DNS inspection engine in Cisco ASA Software 9.0 before 9.0(4.13), 9.1 before 9.1(5.7), and 9.2 before 9.2(2) allows remote attackers to cause a denial of service (device reload) via crafted DNS packets.
- CVE-2014-3387High
The SunRPC inspection engine in Cisco ASA Software before versions 7.2(5.14), 8.2(5.51), 8.3(2.42), 8.4(7.23), 8.5(1.21), 8.6(1.14), 8.7(1.13), 9.0(4.5), and 9.1(5.3) allows remote attackers to cause a denial of service (device reload) via crafted SunRPC packets.
- CVE-2014-3386High
The GPRS Tunneling Protocol (GTP) inspection engine in Cisco ASA Software before version 8.2(5.51), 8.4(7.15), 8.7(1.13), 9.0(4.8), and 9.1(5.1) allows remote attackers to cause a denial of service (device reload) via a crafted series of GTP packets.
- CVE-2014-3385High
A race condition in the Health and Performance Monitoring (HPM) for ASDM feature in Cisco ASA allows remote attackers to cause a denial of service by generating many half-open TCP connections simultaneously.
- CVE-2014-3384High
The IKEv2 implementation in Cisco ASA Software before versions 8.4(7.15), 8.6(1.14), 9.0(4.8), and 9.1(5.1) allows remote attackers to cause a denial of service by sending a crafted packet during tunnel creation.
- CVE-2014-3383High
The IKE implementation in the VPN component in Cisco ASA Software 9.1 before 9.1(5.1) allows remote attackers to cause a denial of service (device reload) via crafted UDP packets.
Original NVD description (English source)
A vulnerability in the login authentication functionality of the Remote Access SSL VPN feature of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to deny further VPN user authentications for several minutes, resulting in a temporary denial of service (DoS) condition. This vulnerability is due to ineffective handling of memory resources during the authentication process. An attacker could exploit this vulnerability by sending crafted packets, which could cause resource exhaustion of the authentication process. A successful exploit could allow the attacker to deny authentication for Remote Access SSL VPN users for several minutes, resulting in a temporary DoS condition.