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.

• cisco firepower management center virtual appliance 6.3.0 • cisco firepower management center virtual appliance 6.4.0 • cisco firepower management center virtual appliance 6.4.0.13 • cisco firepower management center virtual appliance 6.5.0 • cisco firepower management center virtual appliance 6.6.0 • cisco firepower management center virtual appliance 6.7.0.3 • cisco firepower management center virtual appliance 6.7.1 • cisco firepower management center virtual appliance 7.0.0 • cisco secure firewall threat defense (>= 6.3.0 < 6.4.0.13) • cisco secure firewall threat defense (>= 6.5.0 < 6.6.5) • cisco secure firewall threat defense (>= 6.7.0 < 6.7.0.3) • cisco secure firewall threat defense (>= 7.0.0 < 7.0.1) • cisco sourcefire defense center 6.3.0 • cisco sourcefire defense center 6.4.0 • cisco sourcefire defense center 6.4.0.13 • cisco sourcefire defense center 6.5.0 • cisco sourcefire defense center 6.6.0 • cisco sourcefire defense center 6.7.0.3 • cisco sourcefire defense center 6.7.1 • cisco sourcefire defense center 7.0.0