cvedb.io
CVE-2021-34781
HIGH · CVSS 8.6
EPSS exploitation probability: 0%
Published 2021-10-27T19:15:08.233 · Last modified 2026-06-17T03:56:33.473

Summary

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

cisco — firepower_management_center_virtual_appliance

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References

This product uses data from the NVD API but is not endorsed or certified by the NVD. Informational only; not professional security advice.