CVE-2021-34781
Description
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.
How to fix
- cisco secure_firewall_threat_defense6.4.0.13, 6.6.5, 6.7.0.3, 7.0.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| cisco firepower_management_center_virtual_appliance | 6.3.0, 6.4.0, 6.4.0.13, 6.5.0, 6.6.0, 6.7.0.3, 6.7.1, 7.0.0 | — |
| cisco secure_firewall_threat_defense | 6.3.0 ≤ v < 6.4.0.13, 6.5.0 ≤ v < 6.6.5, 6.7.0 ≤ v < 6.7.0.3, 7.0.0 ≤ v < 7.0.1 | 6.4.0.13, 6.6.5, 6.7.0.3, 7.0.1 |
| cisco sourcefire_defense_center | 6.3.0, 6.4.0, 6.4.0.13, 6.5.0, 6.6.0, 6.7.0.3, 6.7.1, 7.0.0 | — |
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