High severity8.6NVD Advisory· Published May 3, 2022· Updated Aug 11, 2026

CVE-2022-20746

Description

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Cisco Systems, Inc./Secure Firewall Threat Defense2 versions
cpe:2.3:a:cisco:secure_firewall_threat_defense:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:cisco:secure_firewall_threat_defense:*:*:*:*:*:*:*:*range: <6.4.0.15
- cpe:2.3:a:cisco:secure_firewall_threat_defense:7.1.0:*:*:*:*:*:*:*
Cisco Systems, Inc./Firepower Threat Defense Softwarellm-fuzzy2 versions
(expand)+ 1 more
- (no CPE)
- (no CPE)range: n/a

Patches

Vulnerability mechanics

References

tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-tcp-dos-kM9SHhOunvdVendor Advisory

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