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

Summary

CVE	CVE-2024-20330
State	PUBLISHED
Assigner	cisco
Source Priority	CVE Program / NVD first with legacy fallback
Published	2024-10-23 17:15:17 UTC
Updated	2026-08-11 19:33:44 UTC
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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.006610000 probability, percentile 0.484060000 (date 2026-08-12)

Problem Types: CWE-788 | CWE-788 Access of Memory Location After End of Buffer

Version	Source	Type	Score	Severity	Vector
3.1	[email protected]	Primary	7.5	HIGH	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`
3.1	[email protected]	Secondary	8.6	HIGH	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H`
3.1	CNA	CVSSV3_1	8.6	HIGH	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H`

CVSS v3.1 Breakdown

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

Type	Vendor	Product	Version	Update	Edition	Language
Hardware	Cisco	Firepower 2100	-	All	All	All
Hardware	Cisco	Firepower 2110	-	All	All	All
Hardware	Cisco	Firepower 2120	-	All	All	All
Hardware	Cisco	Firepower 2130	-	All	All	All
Hardware	Cisco	Firepower 2140	-	All	All	All
Application	Cisco	Secure Firewall Threat Defense	7.0.0.0	All	All	All
Application	Cisco	Secure Firewall Threat Defense	7.0.0.1	All	All	All
Application	Cisco	Secure Firewall Threat Defense	7.0.1	All	All	All
Application	Cisco	Secure Firewall Threat Defense	7.0.1.1	All	All	All
Application	Cisco	Secure Firewall Threat Defense	7.0.2	All	All	All
Application	Cisco	Secure Firewall Threat Defense	7.0.2.1	All	All	All
Application	Cisco	Secure Firewall Threat Defense	7.0.3	All	All	All
Application	Cisco	Secure Firewall Threat Defense	7.0.4	All	All	All
Application	Cisco	Secure Firewall Threat Defense	7.0.5	All	All	All
Application	Cisco	Secure Firewall Threat Defense	7.0.6	All	All	All
Application	Cisco	Secure Firewall Threat Defense	7.0.6.1	All	All	All
Application	Cisco	Secure Firewall Threat Defense	7.0.6.2	All	All	All
Application	Cisco	Secure Firewall Threat Defense	7.0.6.3	All	All	All
Application	Cisco	Secure Firewall Threat Defense	7.1.0	All	All	All
Application	Cisco	Secure Firewall Threat Defense	7.1.0.1	All	All	All
Application	Cisco	Secure Firewall Threat Defense	7.1.0.3	All	All	All
Application	Cisco	Secure Firewall Threat Defense	7.2.0	All	All	All
Application	Cisco	Secure Firewall Threat Defense	7.2.0.1	All	All	All
Application	Cisco	Secure Firewall Threat Defense	7.2.1	All	All	All
Application	Cisco	Secure Firewall Threat Defense	7.2.2	All	All	All
Application	Cisco	Secure Firewall Threat Defense	7.2.3	All	All	All
Application	Cisco	Secure Firewall Threat Defense	7.2.4	All	All	All
Application	Cisco	Secure Firewall Threat Defense	7.2.4.1	All	All	All
Application	Cisco	Secure Firewall Threat Defense	7.2.5	All	All	All
Application	Cisco	Secure Firewall Threat Defense	7.2.5.1	All	All	All
Application	Cisco	Secure Firewall Threat Defense	7.2.5.2	All	All	All
Application	Cisco	Secure Firewall Threat Defense	7.2.6	All	All	All
Application	Cisco	Secure Firewall Threat Defense	7.2.7	All	All	All
Application	Cisco	Secure Firewall Threat Defense	7.2.8	All	All	All
Application	Cisco	Secure Firewall Threat Defense	7.2.8.1	All	All	All
Application	Cisco	Secure Firewall Threat Defense	7.3.0	All	All	All
Application	Cisco	Secure Firewall Threat Defense	7.3.1	All	All	All
Application	Cisco	Secure Firewall Threat Defense	7.3.1.1	All	All	All
Application	Cisco	Secure Firewall Threat Defense	7.3.1.2	All	All	All
Application	Cisco	Secure Firewall Threat Defense	7.4.1	All	All	All
Application	Cisco	Secure Firewall Threat Defense	7.4.1.1	All	All	All
Application	Cisco	Secure Firewall Threat Defense	7.4.2	All	All	All

Vendor Declared Affected Products

Source	Vendor	Product	Version	Platforms
CNA	Cisco	Cisco Firepower Threat Defense Software	affected 7.0.0	Not specified
CNA	Cisco	Cisco Firepower Threat Defense Software	affected 7.0.0.1	Not specified
CNA	Cisco	Cisco Firepower Threat Defense Software	affected 7.0.1	Not specified
CNA	Cisco	Cisco Firepower Threat Defense Software	affected 7.1.0	Not specified
CNA	Cisco	Cisco Firepower Threat Defense Software	affected 7.0.1.1	Not specified
CNA	Cisco	Cisco Firepower Threat Defense Software	affected 7.1.0.1	Not specified
CNA	Cisco	Cisco Firepower Threat Defense Software	affected 7.0.2	Not specified
CNA	Cisco	Cisco Firepower Threat Defense Software	affected 7.2.0	Not specified
CNA	Cisco	Cisco Firepower Threat Defense Software	affected 7.0.2.1	Not specified
CNA	Cisco	Cisco Firepower Threat Defense Software	affected 7.0.3	Not specified
CNA	Cisco	Cisco Firepower Threat Defense Software	affected 7.2.0.1	Not specified
CNA	Cisco	Cisco Firepower Threat Defense Software	affected 7.0.4	Not specified
CNA	Cisco	Cisco Firepower Threat Defense Software	affected 7.2.1	Not specified
CNA	Cisco	Cisco Firepower Threat Defense Software	affected 7.0.5	Not specified
CNA	Cisco	Cisco Firepower Threat Defense Software	affected 7.3.0	Not specified
CNA	Cisco	Cisco Firepower Threat Defense Software	affected 7.2.2	Not specified
CNA	Cisco	Cisco Firepower Threat Defense Software	affected 7.2.3	Not specified
CNA	Cisco	Cisco Firepower Threat Defense Software	affected 7.3.1	Not specified
CNA	Cisco	Cisco Firepower Threat Defense Software	affected 7.1.0.3	Not specified
CNA	Cisco	Cisco Firepower Threat Defense Software	affected 7.2.4	Not specified
CNA	Cisco	Cisco Firepower Threat Defense Software	affected 7.0.6	Not specified
CNA	Cisco	Cisco Firepower Threat Defense Software	affected 7.2.5	Not specified
CNA	Cisco	Cisco Firepower Threat Defense Software	affected 7.2.4.1	Not specified
CNA	Cisco	Cisco Firepower Threat Defense Software	affected 7.3.1.1	Not specified
CNA	Cisco	Cisco Firepower Threat Defense Software	affected 7.0.6.1	Not specified
CNA	Cisco	Cisco Firepower Threat Defense Software	affected 7.2.5.1	Not specified
CNA	Cisco	Cisco Firepower Threat Defense Software	affected 7.4.1	Not specified
CNA	Cisco	Cisco Firepower Threat Defense Software	affected 7.2.6	Not specified
CNA	Cisco	Cisco Firepower Threat Defense Software	affected 7.0.6.2	Not specified
CNA	Cisco	Cisco Firepower Threat Defense Software	affected 7.4.1.1	Not specified
CNA	Cisco	Cisco Firepower Threat Defense Software	affected 7.2.7	Not specified
CNA	Cisco	Cisco Firepower Threat Defense Software	affected 7.2.5.2	Not specified
CNA	Cisco	Cisco Firepower Threat Defense Software	affected 7.3.1.2	Not specified
CNA	Cisco	Cisco Firepower Threat Defense Software	affected 7.2.8	Not specified
CNA	Cisco	Cisco Firepower Threat Defense Software	affected 7.4.2	Not specified
CNA	Cisco	Cisco Firepower Threat Defense Software	affected 7.2.8.1	Not specified
CNA	Cisco	Cisco Firepower Threat Defense Software	affected 7.0.6.3	Not specified
ADP	Cisco	Firepower Threat Defense Software	affected 7.0.0 7.0.6.3 custom	Not specified
ADP	Cisco	Firepower Threat Defense Software	affected 7.1.0 7.1.0.3 custom	Not specified
ADP	Cisco	Firepower Threat Defense Software	affected 7.2.0 7.2.8.1 custom	Not specified
ADP	Cisco	Firepower Threat Defense Software	affected 7.3.0 7.3.1.2. custom	Not specified
ADP	Cisco	Firepower Threat Defense Software	affected 7.4.1 7.4.2 custom	Not specified

References

Reference	Source	Link	Tags
sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd210...	[email protected]	sec.cloudapps.cisco.com	Vendor Advisory
sec.cloudapps.cisco.com/security/center/viewErp.x	[email protected]	sec.cloudapps.cisco.com	Vendor Advisory
sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc-xs...	[email protected]	sec.cloudapps.cisco.com	Broken Link
CVE Program record	CVE.ORG	www.cve.org	canonical
NVD vulnerability detail	NVD	nvd.nist.gov	canonical, analysis

No vendor comments have been submitted for this CVE.

Additional Advisory Data

Exploits

CNA: The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.

There are currently no legacy QID mappings associated with this CVE.