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 unauthentic…
Impact
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.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Cisco | Firepower Management Center Virtual Appliance | Versions 6.3.0, 6.4.0, 6.4.0.13, 6.5.0, 6.6.0, 6.7.0.3 |
| Cisco | Secure Firewall Threat Defense | from 6.3.0 before 6.4.0.13 from 6.5.0 before 6.6.5 from 6.7.0 before 6.7.0.3 from 7.0.0 before 7.0.1 |
| Cisco | Sourcefire Defense Center | Versions 6.3.0, 6.4.0, 6.4.0.13, 6.5.0, 6.6.0, 6.7.0.3 |