Vulnerability Database

346,508

Total vulnerabilities in the database

CVE-2024-20330 — cisco / firepower_threat_defense

Access of Memory Location After End of Buffer

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.

  • Published: Oct 23, 2024
  • Updated: Nov 16, 2025
  • CVE: CVE-2024-20330
  • Severity: High
  • Exploit:

CVSS v3:

  • Severity: High
  • Score: 8.6
  • AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

CWEs:

Software From Fixed in
cisco / firepower_threat_defense 7.0.0.0 7.0.0.0.x
cisco / firepower_threat_defense 7.0.0.1 7.0.0.1.x
cisco / firepower_threat_defense 7.0.1 7.0.1.x
cisco / firepower_threat_defense 7.0.1.1 7.0.1.1.x
cisco / firepower_threat_defense 7.0.2 7.0.2.x
cisco / firepower_threat_defense 7.0.2.1 7.0.2.1.x
cisco / firepower_threat_defense 7.0.3 7.0.3.x
cisco / firepower_threat_defense 7.0.4 7.0.4.x
cisco / firepower_threat_defense 7.0.5 7.0.5.x
cisco / firepower_threat_defense 7.0.6 7.0.6.x
cisco / firepower_threat_defense 7.0.6.1 7.0.6.1.x
cisco / firepower_threat_defense 7.0.6.2 7.0.6.2.x
cisco / firepower_threat_defense 7.0.6.3 7.0.6.3.x
cisco / firepower_threat_defense 7.1.0 7.1.0.x
cisco / firepower_threat_defense 7.1.0.1 7.1.0.1.x
cisco / firepower_threat_defense 7.1.0.3 7.1.0.3.x
cisco / firepower_threat_defense 7.2.0 7.2.0.x
cisco / firepower_threat_defense 7.2.0.1 7.2.0.1.x
cisco / firepower_threat_defense 7.2.1 7.2.1.x
cisco / firepower_threat_defense 7.2.2 7.2.2.x
cisco / firepower_threat_defense 7.2.3 7.2.3.x
cisco / firepower_threat_defense 7.2.4 7.2.4.x
cisco / firepower_threat_defense 7.2.4.1 7.2.4.1.x
cisco / firepower_threat_defense 7.2.5 7.2.5.x
cisco / firepower_threat_defense 7.2.5.1 7.2.5.1.x
cisco / firepower_threat_defense 7.2.5.2 7.2.5.2.x
cisco / firepower_threat_defense 7.2.6 7.2.6.x
cisco / firepower_threat_defense 7.2.7 7.2.7.x
cisco / firepower_threat_defense 7.2.8 7.2.8.x
cisco / firepower_threat_defense 7.2.8.1 7.2.8.1.x
cisco / firepower_threat_defense 7.3.0 7.3.0.x
cisco / firepower_threat_defense 7.3.1 7.3.1.x
cisco / firepower_threat_defense 7.3.1.1 7.3.1.1.x
cisco / firepower_threat_defense 7.3.1.2 7.3.1.2.x
cisco / firepower_threat_defense 7.4.1 7.4.1.x
cisco / firepower_threat_defense 7.4.1.1 7.4.1.1.x
cisco / firepower_threat_defense 7.4.2 7.4.2.x

Frequently Asked Questions

A security vulnerability is a weakness in software, hardware, or configuration that can be exploited to compromise confidentiality, integrity, or availability. Many vulnerabilities are tracked as CVEs (Common Vulnerabilities and Exposures), which provide a standardized identifier so teams can coordinate patching, mitigation, and risk assessment across tools and vendors.

CVSS (Common Vulnerability Scoring System) estimates technical severity, but it doesn't automatically equal business risk. Prioritize using context like internet exposure, affected asset criticality, known exploitation (proof-of-concept or in-the-wild), and whether compensating controls exist. A "Medium" CVSS on an exposed, production system can be more urgent than a "Critical" on an isolated, non-production host.

A vulnerability is the underlying weakness. An exploit is the method or code used to take advantage of it. A zero-day is a vulnerability that is unknown to the vendor or has no publicly available fix when attackers begin using it. In practice, risk increases sharply when exploitation becomes reliable or widespread.

Recurring findings usually come from incomplete Asset Discovery, inconsistent patch management, inherited images, and configuration drift. In modern environments, you also need to watch the software supply chain: dependencies, containers, build pipelines, and third-party services can reintroduce the same weakness even after you patch a single host. Unknown or unmanaged assets (often called Shadow IT) are a common reason the same issues resurface.

Use a simple, repeatable triage model: focus first on externally exposed assets, high-value systems (identity, VPN, email, production), vulnerabilities with known exploits, and issues that enable remote code execution or privilege escalation. Then enforce patch SLAs and track progress using consistent metrics so remediation is steady, not reactive.

SynScan combines attack surface monitoring and continuous security auditing to keep your inventory current, flag high-impact vulnerabilities early, and help you turn raw findings into a practical remediation plan.