CVSS: 7.5EPSS: 0%CPEs: 48EXPL: 0CVE-2021-34737 – Cisco IOS XR Software DHCP Version 4 Server Denial of Service Vulnerability
https://notcve.org/view.php?id=CVE-2021-34737
A vulnerability in the DHCP version 4 (DHCPv4) server feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to trigger a crash of the dhcpd process, resulting in a denial of service (DoS) condition. This vulnerability exists because certain DHCPv4 messages are improperly validated when they are processed by an affected device. An attacker could exploit this vulnerability by sending a malformed DHCPv4 message to an affected device. A successful exploit could allow the attacker to cause a NULL pointer dereference, resulting in a crash of the dhcpd process. While the dhcpd process is restarting, which may take up to approximately two minutes, DHCPv4 server services are unavailable on the affected device. • https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-dhcp-dos-pjPVReLU • CWE-476: NULL Pointer Dereference •
CVSS: 7.8EPSS: 0%CPEs: 63EXPL: 0CVE-2021-34728 – Cisco IOS XR Software Authenticated User Privilege Escalation Vulnerabilities
https://notcve.org/view.php?id=CVE-2021-34728
Multiple vulnerabilities in the CLI of Cisco IOS XR Software could allow an authenticated, local attacker with a low-privileged account to elevate privileges on an affected device. For more information about these vulnerabilities, see the Details section of this advisory. Múltiples vulnerabilidades en la CLI de Cisco IOS XR Software podrían permitir a un atacante local autenticado con una cuenta de bajo privilegio elevar los privilegios en un dispositivo afectado. Para conseguir más información sobre estas vulnerabilidades, consulte la sección Details de este aviso • https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-privescal-dZYMrKf • CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') •
CVSS: 7.2EPSS: 0%CPEs: 59EXPL: 0CVE-2021-34722 – Cisco IOS XR Software Command Injection Vulnerabilities
https://notcve.org/view.php?id=CVE-2021-34722
Multiple vulnerabilities in the CLI of Cisco IOS XR Software could allow an authenticated, local attacker to gain access to the underlying root shell of an affected device and execute arbitrary commands with root privileges. For more information about these vulnerabilities, see the Details section of this advisory. Varias vulnerabilidades en la CLI de Cisco IOS XR Software podrían permitir a un atacante local autenticado conseguir acceso al shell root subyacente de un dispositivo afectado y ejecutar comandos arbitrario con privilegios de root. Para conseguir más información sobre estas vulnerabilidades, consulte la sección Details de este aviso • https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-cmd-inj-wbZKvPxc • CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') •
CVSS: 6.9EPSS: 0%CPEs: 59EXPL: 0CVE-2021-34721 – Cisco IOS XR Software Command Injection Vulnerabilities
https://notcve.org/view.php?id=CVE-2021-34721
Multiple vulnerabilities in the CLI of Cisco IOS XR Software could allow an authenticated, local attacker to gain access to the underlying root shell of an affected device and execute arbitrary commands with root privileges. For more information about these vulnerabilities, see the Details section of this advisory. Varias vulnerabilidades en la CLI de Cisco IOS XR Software podrían permitir a un atacante local autenticado conseguir acceso al shell root subyacente de un dispositivo afectado y ejecutar comandos arbitrario con privilegios de root. Para conseguir más información sobre estas vulnerabilidades, consulte la sección Details de este aviso • https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-cmd-inj-wbZKvPxc • CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') •
CVSS: 8.6EPSS: 0%CPEs: 72EXPL: 0CVE-2021-34720 – Cisco IOS XR Software IP Service Level Agreements and Two-Way Active Measurement Protocol Denial of Service Vulnerability
https://notcve.org/view.php?id=CVE-2021-34720
A vulnerability in the IP Service Level Agreements (IP SLA) responder and Two-Way Active Measurement Protocol (TWAMP) features of Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause device packet memory to become exhausted or cause the IP SLA process to crash, resulting in a denial of service (DoS) condition. This vulnerability exists because socket creation failures are mishandled during the IP SLA and TWAMP processes. An attacker could exploit this vulnerability by sending specific IP SLA or TWAMP packets to an affected device. A successful exploit could allow the attacker to exhaust the packet memory, which will impact other processes, such as routing protocols, or crash the IP SLA process. Una vulnerabilidad en las funciones de respuesta de los Acuerdos de Nivel de Servicio IP (IP SLA) y del Protocolo de Medición Activa de Dos Vías (TWAMP) de Cisco IOS XR Software podría permitir a un atacante remoto no autenticado causar el agotamiento de la memoria de paquetes del dispositivo o causar el bloqueo del proceso IP SLA, resultando en una condición de denegación de servicio (DoS). • https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ipsla-ZA3SRrpP • CWE-771: Missing Reference to Active Allocated Resource •