ReviewHigh

CVE-2022-20746

Cisco Cisco Firepower Threat Defense Software, secure firewall threat defense

A vulnerability in the TCP proxy functionality of Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to trigger a denial of service (DoS) condition. This vulnerability is due to improper handling of TCP flows. An attacker could exploit this vulnerability by sending a crafted stream of TCP traffic through an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.

CVSS: 7.5
EPSS: 1.32%
CISA KEV: Not listed
Published: 2022.05.03

PRIORITY ASSESSMENT

Review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability1.32%

Technical severityCVSS 7.5

Vulnerability overview

Affected product and versions

Product: Cisco Cisco Firepower Threat Defense Software, secure firewall threat defense
Affected versions: < 6.4.0.15, >= 6.5.0 < 6.6.5.2, >= 7.0.0 < 7.0.2, 7.1.0
Fixed versions: 6.4.0.15, 6.6.5.2, 7.0.2

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that Cisco Cisco Firepower Threat Defense Software, secure firewall threat defense and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
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-476