CVSS: 8.6EPSS: 0%CPEs: 24EXPL: 0CVE-2021-34793 – Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Transparent Mode Denial of Service Vulnerability
https://notcve.org/view.php?id=CVE-2021-34793
A vulnerability in the TCP Normalizer of Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software operating in transparent mode could allow an unauthenticated, remote attacker to poison MAC address tables, resulting in a denial of service (DoS) vulnerability. This vulnerability is due to incorrect handling of certain TCP segments when the affected device is operating in transparent mode. An attacker could exploit this vulnerability by sending a crafted TCP segment through an affected device. A successful exploit could allow the attacker to poison the MAC address tables in adjacent devices, resulting in network disruption. Una vulnerabilidad en el Normalizador TCP del software Cisco Adaptive Security Appliance (ASA) y del software Firepower Threat Defense (FTD) que funciona en modo transparente podría permitir a un atacante remoto no autenticado envenenar las tablas de direcciones MAC, lo que provocaría una vulnerabilidad de denegación de servicio (DoS). • https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asa-ftd-dos-JxYWMJyL • CWE-924: Improper Enforcement of Message Integrity During Transmission in a Communication Channel •
CVSS: 5.3EPSS: 0%CPEs: 31EXPL: 0CVE-2021-34791 – Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Application Level Gateway Bypass Vulnerabilities
https://notcve.org/view.php?id=CVE-2021-34791
Multiple vulnerabilities in the Application Level Gateway (ALG) for the Network Address Translation (NAT) feature of Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass the ALG and open unauthorized connections with a host located behind the ALG. For more information about these vulnerabilities, see the Details section of this advisory. Note: These vulnerabilities have been publicly discussed as NAT Slipstreaming. Varias vulnerabilidades en la Puerta de Enlace de Nivel de Aplicación (ALG) para la funcionalidad Network Address Translation (NAT) del software Cisco Adaptive Security Appliance (ASA) y el software Firepower Threat Defense (FTD) podrían permitir a un atacante remoto no autenticado omitir la ALG y abrir conexiones no autorizadas con un host situado detrás de la ALG. Para conseguir más información sobre estas vulnerabilidades, consulte la sección Detalles de este aviso. • https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-natalg-bypass-cpKGqkng • CWE-20: Improper Input Validation CWE-358: Improperly Implemented Security Check for Standard •
CVSS: 5.3EPSS: 0%CPEs: 31EXPL: 0CVE-2021-34790 – Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Application Level Gateway Bypass Vulnerabilities
https://notcve.org/view.php?id=CVE-2021-34790
Multiple vulnerabilities in the Application Level Gateway (ALG) for the Network Address Translation (NAT) feature of Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass the ALG and open unauthorized connections with a host located behind the ALG. For more information about these vulnerabilities, see the Details section of this advisory. Note: These vulnerabilities have been publicly discussed as NAT Slipstreaming. Varias vulnerabilidades en la Puerta de Enlace de Nivel de Aplicación (ALG) para la funcionalidad Network Address Translation (NAT) del software Cisco Adaptive Security Appliance (ASA) y el software Firepower Threat Defense (FTD) podrían permitir a un atacante remoto no autenticado omitir el ALG y abrir conexiones no autorizadas con un host situado detrás del ALG. Para conseguir más información sobre estas vulnerabilidades, consulte la sección Detalles de este aviso. • https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-natalg-bypass-cpKGqkng • CWE-20: Improper Input Validation CWE-358: Improperly Implemented Security Check for Standard •
CVSS: 5.3EPSS: 0%CPEs: 33EXPL: 0CVE-2021-34787 – Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Identity-Based Rule Bypass Vulnerability
https://notcve.org/view.php?id=CVE-2021-34787
A vulnerability in the identity-based firewall (IDFW) rule processing feature of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass security protections. This vulnerability is due to improper handling of network requests by affected devices configured to use object group search. An attacker could exploit this vulnerability by sending a specially crafted network request to an affected device. A successful exploit could allow the attacker to bypass access control list (ACL) rules on the device, bypass security protections, and send network traffic to unauthorized hosts. Una vulnerabilidad en la funcionalidad de procesamiento de reglas del firewall basado en la identidad (IDFW) del software Cisco Adaptive Security Appliance (ASA) y del software Cisco Firepower Threat Defense (FTD) podría permitir a un atacante remoto no autenticado omitir las protecciones de seguridad. • https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-rule-bypass-ejjOgQEY • CWE-183: Permissive List of Allowed Inputs CWE-755: Improper Handling of Exceptional Conditions •
CVSS: 8.6EPSS: 0%CPEs: 20EXPL: 0CVE-2021-34781 – Cisco Firepower Threat Defense Software SSH Connections Denial of Service Vulnerability
https://notcve.org/view.php?id=CVE-2021-34781
A vulnerability in the processing of SSH connections for multi-instance deployments of Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on the affected device. This vulnerability is due to a lack of proper error handling when an SSH session fails to be established. An attacker could exploit this vulnerability by sending a high rate of crafted SSH connections to the instance. A successful exploit could allow the attacker to cause resource exhaustion, which causes a DoS condition on the affected device. The device must be manually reloaded to recover. • https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-dos-rUDseW3r • CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer CWE-755: Improper Handling of Exceptional Conditions •