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CVE-2022-20854

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.

CVSS
7.5
EPSS
0.89%
56.9% percentile
CISA KEV
Not listed
Published
2022.11.16
PRIORITY ASSESSMENT

Review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.89%
Technical severityCVSS 7.5

Vulnerability overview

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 product and versions

Product
Cisco Cisco Firepower Management Center, Cisco Firepower Threat Defense Software, secure firewall management center
Affected versions
>= 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
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Cisco Cisco Firepower Management Center, Cisco Firepower Threat Defense Software, secure firewall management center and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
CWE-400, CWE-755