CVE-2024-20330

Cisco Firepower Threat Defense Software for Cisco Firepower 2100 Series TCP UDP Snort 2 and Snort 2 Denial of Service Vulnerability

View on CVE.org

Published Oct 23, 2024 CVSS 3.1 · 8.6 High EPSS < 1% KEV · Not listed

Description

A vulnerability in the Snort 2 and Snort 3 TCP and UDP detection engine of Cisco Firepower Threat Defense (FTD) Software for Cisco Firepower 2100 Series Appliances could allow an unauthenticated, remote attacker to cause memory corruption, which could cause the Snort detection engine to restart unexpectedly.

This vulnerability is due to improper memory management when the Snort detection engine processes specific TCP or UDP packets. An attacker could exploit this vulnerability by sending crafted TCP or UDP packets through a device that is inspecting traffic using the Snort detection engine. A successful exploit could allow the attacker to restart the Snort detection engine repeatedly, which could cause a denial of service (DoS) condition. The DoS condition impacts only the traffic through the device that is examined by the Snort detection engine. The device can still be managed over the network.
Note: Once a memory block is corrupted, it cannot be cleared until the Cisco Firepower 2100 Series Appliance is manually reloaded. This means that the Snort detection engine could crash repeatedly, causing traffic that is processed by the Snort detection engine to be dropped until the device is manually reloaded.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Cisco

Cisco Firepower Threat Defense Software

unknown

Version	Status	Constraints
`7.0.0`	affected	—
`7.0.0.1`	affected	—
`7.0.1`	affected	—
`7.1.0`	affected	—
`7.0.1.1`	affected	—
`7.1.0.1`	affected	—
`7.0.2`	affected	—
`7.2.0`	affected	—
`7.0.2.1`	affected	—
`7.0.3`	affected	—
`7.2.0.1`	affected	—
`7.0.4`	affected	—
`7.2.1`	affected	—
`7.0.5`	affected	—
`7.3.0`	affected	—
`7.2.2`	affected	—
`7.2.3`	affected	—
`7.3.1`	affected	—
`7.1.0.3`	affected	—
`7.2.4`	affected	—
`7.0.6`	affected	—
`7.2.5`	affected	—
`7.2.4.1`	affected	—
`7.3.1.1`	affected	—
`7.0.6.1`	affected	—
`7.2.5.1`	affected	—
`7.4.1`	affected	—
`7.2.6`	affected	—
`7.0.6.2`	affected	—
`7.4.1.1`	affected	—
`7.2.7`	affected	—
`7.2.5.2`	affected	—
`7.3.1.2`	affected	—
`7.2.8`	affected	—
`7.4.2`	affected	—
`7.2.8.1`	affected	—
`7.0.6.3`	affected	—

Configuration 1 [-]

AND

OR	cpe:2.3:a:cisco:secure_firewall_threat_defense:7.0.0.0:::::::*
	cpe:2.3:a:cisco:secure_firewall_threat_defense:7.0.0.1:::::::*
	cpe:2.3:a:cisco:secure_firewall_threat_defense:7.0.1:::::::*
	cpe:2.3:a:cisco:secure_firewall_threat_defense:7.0.1.1:::::::*
	cpe:2.3:a:cisco:secure_firewall_threat_defense:7.0.2:::::::*
	cpe:2.3:a:cisco:secure_firewall_threat_defense:7.0.2.1:::::::*
	cpe:2.3:a:cisco:secure_firewall_threat_defense:7.0.3:::::::*
	cpe:2.3:a:cisco:secure_firewall_threat_defense:7.0.4:::::::*
	cpe:2.3:a:cisco:secure_firewall_threat_defense:7.0.5:::::::*
	cpe:2.3:a:cisco:secure_firewall_threat_defense:7.0.6:::::::*
	cpe:2.3:a:cisco:secure_firewall_threat_defense:7.0.6.1:::::::*
	cpe:2.3:a:cisco:secure_firewall_threat_defense:7.0.6.2:::::::*
	cpe:2.3:a:cisco:secure_firewall_threat_defense:7.0.6.3:::::::*
	cpe:2.3:a:cisco:secure_firewall_threat_defense:7.1.0:::::::*
	cpe:2.3:a:cisco:secure_firewall_threat_defense:7.1.0.1:::::::*
	cpe:2.3:a:cisco:secure_firewall_threat_defense:7.1.0.3:::::::*
	cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.0:::::::*
	cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.0.1:::::::*
	cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.1:::::::*
	cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.2:::::::*
	cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.3:::::::*
	cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.4:::::::*
	cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.4.1:::::::*
	cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.5:::::::*
	cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.5.1:::::::*
	cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.5.2:::::::*
	cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.6:::::::*
	cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.7:::::::*
	cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.8:::::::*
	cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.8.1:::::::*
	cpe:2.3:a:cisco:secure_firewall_threat_defense:7.3.0:::::::*
	cpe:2.3:a:cisco:secure_firewall_threat_defense:7.3.1:::::::*
	cpe:2.3:a:cisco:secure_firewall_threat_defense:7.3.1.1:::::::*
	cpe:2.3:a:cisco:secure_firewall_threat_defense:7.3.1.2:::::::*
	cpe:2.3:a:cisco:secure_firewall_threat_defense:7.4.1:::::::*
	cpe:2.3:a:cisco:secure_firewall_threat_defense:7.4.1.1:::::::*
	cpe:2.3:a:cisco:secure_firewall_threat_defense:7.4.2:::::::*

OR	cpe:2.3:h:cisco:firepower_2100:-:::::::*
	cpe:2.3:h:cisco:firepower_2110:-:::::::*
	cpe:2.3:h:cisco:firepower_2120:-:::::::*
	cpe:2.3:h:cisco:firepower_2130:-:::::::*
	cpe:2.3:h:cisco:firepower_2140:-:::::::*

No data.

No data available yet.

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

Source	ID	Title
EUVD	EUVD-2024-18045	A vulnerability in the Snort 2 and Snort 3 TCP and UDP detection engine of Cisco Firepower Threat Defense (FTD) Software for Cisco Firepower 2100 Series Appliances could allow an unauthenticated, remote attacker to cause memory corruption, which could cause the Snort detection engine to restart unexpectedly. This vulnerability is due to improper memory management when the Snort detection engine processes specific TCP or UDP packets. An attacker could exploit this vulnerability by sending crafted TCP or UDP packets through a device that is inspecting traffic using the Snort detection engine. A successful exploit could allow the attacker to restart the Snort detection engine repeatedly, which could cause a denial of service (DoS) condition. The DoS condition impacts only the traffic through the device that is examined by the Snort detection engine. The device can still be managed over the network. Note: Once a memory block is corrupted, it cannot be cleared until the Cisco Firepower 2100 Series Appliance is manually reloaded. This means that the Snort detection engine could crash repeatedly, causing traffic that is processed by the Snort detection engine to be dropped until the device is manually reloaded.

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Changed

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.661% probability within 30 days)

Exploitation none

Automatable yes

Technical Impact partial

References

Link	Providers
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc-xss-M446vbEO
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd2100-snort-dos-M9HuMt75
https://sec.cloudapps.cisco.com/security/center/viewErp.x?alertId=ERP-75300

History

Aug 11, 2026 8:00 PM First appearance in the feed. Affected versions updated. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Cisco secure Firewall Threat Defense
CPEs	cpe:2.3:a:cisco:firepower_threat_defense:7.0.0.0:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.0.0.1:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.0.1.1:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.0.1:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.0.2.1:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.0.2:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.0.3:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.0.4:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.0.5:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.0.6.1:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.0.6.2:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.0.6.3:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.0.6:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.1.0.1:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.1.0.3:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.1.0:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.2.0.1:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.2.0:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.2.1:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.2.2:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.2.3:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.2.4.1:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.2.4:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.2.5.1:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.2.5.2:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.2.5:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.2.6:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.2.7:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.2.8.1:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.2.8:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.3.0:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.3.1.1:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.3.1.2:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.3.1:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.4.1.1:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.4.1:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.4.2:::::::*	cpe:2.3:a:cisco:secure_firewall_threat_defense:7.0.0.0:::::::* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.0.0.1:::::::* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.0.1.1:::::::* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.0.1:::::::* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.0.2.1:::::::* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.0.2:::::::* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.0.3:::::::* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.0.4:::::::* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.0.5:::::::* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.0.6.1:::::::* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.0.6.2:::::::* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.0.6.3:::::::* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.0.6:::::::* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.1.0.1:::::::* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.1.0.3:::::::* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.1.0:::::::* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.0.1:::::::* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.0:::::::* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.1:::::::* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.2:::::::* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.3:::::::* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.4.1:::::::* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.4:::::::* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.5.1:::::::* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.5.2:::::::* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.5:::::::* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.6:::::::* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.7:::::::* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.8.1:::::::* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.8:::::::* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.3.0:::::::* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.3.1.1:::::::* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.3.1.2:::::::* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.3.1:::::::* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.4.1.1:::::::* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.4.1:::::::* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.4.2:::::::*
Vendors & Products	Cisco firepower Threat Defense	Cisco secure Firewall Threat Defense

Aug 6, 2025 3:30 PM First appearance in the feed. Affected versions updated. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Cisco firepower 2100 Cisco firepower 2110 Cisco firepower 2120 Cisco firepower 2130 Cisco firepower 2140 Cisco firepower Threat Defense
CPEs		cpe:2.3:a:cisco:firepower_threat_defense:7.0.0.0:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.0.0.1:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.0.1.1:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.0.1:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.0.2.1:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.0.2:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.0.3:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.0.4:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.0.5:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.0.6.1:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.0.6.2:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.0.6.3:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.0.6:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.1.0.1:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.1.0.3:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.1.0:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.2.0.1:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.2.0:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.2.1:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.2.2:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.2.3:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.2.4.1:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.2.4:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.2.5.1:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.2.5.2:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.2.5:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.2.6:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.2.7:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.2.8.1:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.2.8:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.3.0:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.3.1.1:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.3.1.2:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.3.1:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.4.1.1:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.4.1:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.4.2:::::::* cpe:2.3:h:cisco:firepower_2100:-:::::::* cpe:2.3:h:cisco:firepower_2110:-:::::::* cpe:2.3:h:cisco:firepower_2120:-:::::::* cpe:2.3:h:cisco:firepower_2130:-:::::::* cpe:2.3:h:cisco:firepower_2140:-:::::::*
Vendors & Products		Cisco firepower 2100 Cisco firepower 2110 Cisco firepower 2120 Cisco firepower 2130 Cisco firepower 2140 Cisco firepower Threat Defense

Oct 24, 2024 5:15 PM First appearance in the feed. Affected versions updated. Affected vendors updated. Scoring metrics updated View changes

Type	Values Removed	Values Added
First Time appeared		Cisco Cisco firepower Threat Defense Software
CPEs		cpe:2.3:a:cisco:firepower_threat_defense_software::::::::
Vendors & Products		Cisco Cisco firepower Threat Defense Software
Metrics		ssvc `{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Oct 23, 2024 5:15 PM Description updated. Title updated. Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		A vulnerability in the Snort 2 and Snort 3 TCP and UDP detection engine of Cisco Firepower Threat Defense (FTD) Software for Cisco Firepower 2100 Series Appliances could allow an unauthenticated, remote attacker to cause memory corruption, which could cause the Snort detection engine to restart unexpectedly. This vulnerability is due to improper memory management when the Snort detection engine processes specific TCP or UDP packets. An attacker could exploit this vulnerability by sending crafted TCP or UDP packets through a device that is inspecting traffic using the Snort detection engine. A successful exploit could allow the attacker to restart the Snort detection engine repeatedly, which could cause a denial of service (DoS) condition. The DoS condition impacts only the traffic through the device that is examined by the Snort detection engine. The device can still be managed over the network. Note: Once a memory block is corrupted, it cannot be cleared until the Cisco Firepower 2100 Series Appliance is manually reloaded. This means that the Snort detection engine could crash repeatedly, causing traffic that is processed by the Snort detection engine to be dropped until the device is manually reloaded.
Title		Cisco Firepower Threat Defense Software for Cisco Firepower 2100 Series TCP UDP Snort 2 and Snort 2 Denial of Service Vulnerability
Weaknesses		CWE-788
References		https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc-xss-M446vbEO https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd2100-snort-dos-M9HuMt75 https://sec.cloudapps.cisco.com/security/center/viewErp.x?alertId=ERP-75300
Metrics		cvssV3_1 `{'score': 8.6, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H'}`