CVE intelligence and bounded remediation

CVE-2024-20407 — Cisco Firepower Threat Defense security vulnerability

Medium CVSS 5.8

A vulnerability in the interaction between the TCP Intercept feature and the Snort 3 detection engine on Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass configured policies on an affected system. Devices that are configured with Snort 2 are not affected by this vulnerability. This vulnerability is due to a logic error when handling embryonic (half-open) TCP connections. An attacker could exploit this vulnerability by sending a crafted traffic pattern through an affected device. A successful exploit could allow unintended traffic to enter the network protected by the affected device.

Severity
Medium
CVSS
5.8 (3.1)
Published
2024-10-23
CISA KEV
Not currently listed
Ecosystem
software/application
Weaknesses
CWE-399

Affected products

  • cisco / firepower_threat_defense / 6.2.3
  • cisco / firepower_threat_defense / 6.2.3.1
  • cisco / firepower_threat_defense / 6.2.3.2
  • cisco / firepower_threat_defense / 6.2.3.3
  • cisco / firepower_threat_defense / 6.2.3.4
  • cisco / firepower_threat_defense / 6.2.3.5

Showing 6 representative product identities from 90 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

Matched remediation archetype

General vulnerability remediation

This catalog composition supplies bounded fallback guidance. Explicitly reviewed curated workflows load with the complete record below.

Check exposure

  • Confirm the affected component, deployment paths, reachable interfaces, and enabled features from inventories and configuration, without probing production destructively.
  • Compare the advisory's affected conditions with the repository lockfiles, build manifests, artifacts, and runtime inventory.
  • Identify data sensitivity, trust boundaries, and privilege level for every confirmed affected deployment.

Remediate safely

  • Apply a vendor-supported fix or remove the affected component or feature; record the selected change and its source in the repository.
  • Update direct and transitive dependency locks, generated artifacts, deployment manifests, and asset inventories together.
  • Add a regression test for the documented unsafe condition using inert inputs and preserve rollback instructions.

Authoritative sources

Complete CVE record and remediation plan

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