Denial of service in Cisco Firepower Threat Defense Software

Published: 2022-04-28
Risk High
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2022-20751
Exploitation vector Network
Public exploit N/A
Vulnerable software
Cisco Firepower Threat Defense (FTD)
Hardware solutions / Security hardware applicances

Firepower 1000 Series Appliances
Hardware solutions / Other hardware appliances

Firepower 2100 Series Security Appliance
Server applications / IDS/IPS systems, Firewalls and proxy servers

Cisco Firepower 4100 Series Next-Generation Firewall
Hardware solutions / Firmware

Vendor Cisco Systems, Inc

Security Bulletin

This security bulletin contains one high risk vulnerability.

1) Allocation of Resources Without Limits or Throttling

EUVDB-ID: #VU62683

Risk: High

CVSSv3.1: 7.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-20751

CWE-ID: CWE-770 - Allocation of Resources Without Limits or Throttling

Exploit availability: No


The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient memory management for certain Snort events. A remote attacker can send a specially crafted IP packet and perform a denial of service (DoS) attack.


Install updates from vendor's website.

Vulnerable software versions

Cisco Firepower Threat Defense (FTD): 6.2.2, 6.2.3, 6.3.0, 6.4.0, 6.5.0, 6.6.0, 6.7.0

Firepower 1000 Series Appliances: All versions

Firepower 2100 Series Security Appliance: All versions

Cisco Firepower 4100 Series Next-Generation Firewall: All versions

CPE2.3 External links

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.