CVE-2022-20854 evidence review
Cisco Cisco Firepower Management Center, Cisco Firepower Threat Defense Software, secure firewall management center
A vulnerability in the processing of SSH connections of Cisco Firepower Management Center (FMC) and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper 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, resulting in a reboot on the affected device.
This record remains available for product and version identification, but it is not presented as a complete remediation procedure. Confirm the affected range and the supported fix in a direct vendor advisory before changing production systems.
Identify the product and installed version
Record whether Cisco Cisco Firepower Management Center, Cisco Firepower Threat Defense Software, secure firewall management center is present, where it is installed, and which interfaces are exposed.
- Record the product name, package or appliance identifier, and installed version.
- Identify internet-facing, administrative, API, and internal access paths.
- Preserve the pre-change configuration and relevant service logs.
Compare the affected range
Use the current record as an identification aid: >= 6.1.0 <= 6.1.0.7, >= 6.2.0 <= 6.2.0.6, >= 6.2.2 <= 6.2.2.5, >= 6.2.3 <= 6.2.3.18, >= 6.3.0 <= 6.3.0.5, >= 6.4.0 <= 6.4.0.15, >= 6.5.0 <= 6.5.0.5, >= 6.7.0 <= 6.7.0.3, 6.2.1, 6.6.0, 6.6.0.1, 6.6.1, 6.6.3, 6.6.4, 6.6.5, 6.6.5.1, 6.6.5.2, 7.0.0, 7.0.0.1, 7.0.1. Resolve incomplete inventory results before deciding that an asset is unaffected.
Verify the authoritative remediation source
Open the linked source material and locate a direct vendor advisory for this CVE. Confirm the supported fixed release and product-specific update path before making a production change.
Operational boundary
This page does not replace the vendor advisory, support contract, change-management process, or recovery plan. Do not infer that an asset is unaffected from an incomplete inventory query or a missing fixed-version field.