CVSS: 7.4EPSS: 0%CPEs: 251EXPL: 0CVE-2021-34714 – Multiple Cisco Operating Systems Unidirectional Link Detection Denial of Service Vulnerability
https://notcve.org/view.php?id=CVE-2021-34714
A vulnerability in the Unidirectional Link Detection (UDLD) feature of Cisco FXOS Software, Cisco IOS Software, Cisco IOS XE Software, Cisco IOS XR Software, and Cisco NX-OS Software could allow an unauthenticated, adjacent attacker to cause an affected device to reload. This vulnerability is due to improper input validation of the UDLD packets. An attacker could exploit this vulnerability by sending specifically crafted UDLD packets to an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a denial of service (DoS) condition. Note: The UDLD feature is disabled by default, and the conditions to exploit this vulnerability are strict. • https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-nxos-xr-udld-dos-W5hGHgtQ • CWE-20: Improper Input Validation •
CVSS: 5.3EPSS: 0%CPEs: 105EXPL: 0CVE-2021-1590 – Cisco NX-OS Software system login block-for Denial of Service Vulnerability
https://notcve.org/view.php?id=CVE-2021-1590
A vulnerability in the implementation of the system login block-for command for Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause a login process to unexpectedly restart, causing a denial of service (DoS) condition. This vulnerability is due to a logic error in the implementation of the system login block-for command when an attack is detected and acted upon. An attacker could exploit this vulnerability by performing a brute-force login attack on an affected device. A successful exploit could allow the attacker to cause a login process to reload, which could result in a delay during authentication to the affected device. Una vulnerabilidad en la implementación del comando system login block-for para el Software Cisco NX-OS, podría permitir a un atacante remoto no autenticado causar que un proceso de inicio de sesión se reinicie inesperadamente, causando una condición de denegación de servicio (DoS). • https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-login-blockfor-RwjGVEcu • CWE-787: Out-of-bounds Write •
CVSS: 8.6EPSS: 0%CPEs: 470EXPL: 0CVE-2021-1387 – Cisco NX-OS Software IPv6 Netstack Denial of Service Vulnerability
https://notcve.org/view.php?id=CVE-2021-1387
A vulnerability in the network stack of Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability exists because the software improperly releases resources when it processes certain IPv6 packets that are destined to an affected device. An attacker could exploit this vulnerability by sending multiple crafted IPv6 packets to an affected device. A successful exploit could cause the network stack to run out of available buffers, impairing operations of control plane and management plane protocols and resulting in a DoS condition. Manual intervention would be required to restore normal operations on the affected device. • https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-ipv6-netstack-edXPGV7K • CWE-401: Missing Release of Memory after Effective Lifetime •
CVSS: 7.8EPSS: 0%CPEs: 134EXPL: 0CVE-2015-6393
https://notcve.org/view.php?id=CVE-2015-6393
Cisco NX-OS 4.1 through 7.3 and 11.0 through 11.2 on Nexus 2000, 3000, 3500, 5000, 5500, 5600, 6000, 7000, 7700, and 9000 devices allows remote attackers to cause a denial of service (device crash) via malformed IPv4 DHCP packets to the DHCPv4 relay agent, aka Bug IDs CSCuq39250, CSCus21733, CSCus21739, CSCut76171, and CSCux67182. Cisco NX-OS 4.1 hasta la versión 7.3 y 11.0 hasta la versión 11.2 en dispositivos Nexus 2000, 3000, 3500, 5000, 5500, 5600, 6000, 7000, 7700 y 9000 permite a atacantes remotos provocar una denegación de servicio (caída de dispositivo) a través de paquetes IPv4 DHCP malformados al agente de retransmisión DHCPv4, vulnerabilidad también conocida como Bug IDs CSCuq39250, CSCus21733, CSCus21739, CSCut76171 y CSCux67182. • http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20161005-dhcp2 http://www.securityfocus.com/bid/93419 http://www.securitytracker.com/id/1036949 • CWE-399: Resource Management Errors •