CVE-2022-20854

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-11-15 · updated 2026-08-11
Weakness: CWE-400

Description

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.

Affected products

Cisco Firepower Management Center: from 6.1.0 through 6.1.0.7; from 6.2.0 through 6.2.0.6; from 6.2.2 through 6.2.2.5; from 6.2.3 through 6.2.3.18; from 6.3.0 through 6.3.0.5; from 6.4.0 through 6.4.0.15
Cisco Firepower Threat Defense Software: from 6.1.0 through 6.1.0.7; from 6.2.0 through 6.2.0.6; from 6.2.2 through 6.2.2.5; from 6.2.3 through 6.2.3.18; from 6.3.0 through 6.3.0.5; from 6.4.0 through 6.4.0.15

References

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