CVE-2024-20407

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.

Published: 2024-10-23 Last update: 2025-08-05 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2024-20407 is rated Low Risk (37.8/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.19%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2024-20407

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-12-01 0.05% 0.19% +0.14%
2 2025-05-19 0.05% 0.05% +0.00%
3 2025-04-15 — 0.05% —

Full EPSS history (5 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2024-20407

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.8 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 1.4 [email protected]

Weakness enumeration for CVE-2024-20407

Affected software / configurations for CVE-2024-20407

Vendor Product Version Raw CPE
cisco firepower_threat_defense 6.2.3 cpe:2.3:a:cisco:firepower_threat_defense:6.2.3:*:*:*:*:*:*:*
cisco firepower_threat_defense 6.2.3.1 cpe:2.3:a:cisco:firepower_threat_defense:6.2.3.1:*:*:*:*:*:*:*
cisco firepower_threat_defense 6.2.3.2 cpe:2.3:a:cisco:firepower_threat_defense:6.2.3.2:*:*:*:*:*:*:*
cisco firepower_threat_defense 6.2.3.3 cpe:2.3:a:cisco:firepower_threat_defense:6.2.3.3:*:*:*:*:*:*:*
cisco firepower_threat_defense 6.2.3.4 cpe:2.3:a:cisco:firepower_threat_defense:6.2.3.4:*:*:*:*:*:*:*
cisco firepower_threat_defense 6.2.3.5 cpe:2.3:a:cisco:firepower_threat_defense:6.2.3.5:*:*:*:*:*:*:*
cisco firepower_threat_defense 6.2.3.6 cpe:2.3:a:cisco:firepower_threat_defense:6.2.3.6:*:*:*:*:*:*:*
cisco firepower_threat_defense 6.2.3.7 cpe:2.3:a:cisco:firepower_threat_defense:6.2.3.7:*:*:*:*:*:*:*
cisco firepower_threat_defense 6.2.3.8 cpe:2.3:a:cisco:firepower_threat_defense:6.2.3.8:*:*:*:*:*:*:*
cisco firepower_threat_defense 6.2.3.9 cpe:2.3:a:cisco:firepower_threat_defense:6.2.3.9:*:*:*:*:*:*:*
cisco firepower_threat_defense 6.2.3.10 cpe:2.3:a:cisco:firepower_threat_defense:6.2.3.10:*:*:*:*:*:*:*
cisco firepower_threat_defense 6.2.3.11 cpe:2.3:a:cisco:firepower_threat_defense:6.2.3.11:*:*:*:*:*:*:*
cisco firepower_threat_defense 6.2.3.12 cpe:2.3:a:cisco:firepower_threat_defense:6.2.3.12:*:*:*:*:*:*:*
cisco firepower_threat_defense 6.2.3.13 cpe:2.3:a:cisco:firepower_threat_defense:6.2.3.13:*:*:*:*:*:*:*
cisco firepower_threat_defense 6.2.3.14 cpe:2.3:a:cisco:firepower_threat_defense:6.2.3.14:*:*:*:*:*:*:*
cisco firepower_threat_defense 6.2.3.15 cpe:2.3:a:cisco:firepower_threat_defense:6.2.3.15:*:*:*:*:*:*:*
cisco firepower_threat_defense 6.2.3.16 cpe:2.3:a:cisco:firepower_threat_defense:6.2.3.16:*:*:*:*:*:*:*
cisco firepower_threat_defense 6.2.3.17 cpe:2.3:a:cisco:firepower_threat_defense:6.2.3.17:*:*:*:*:*:*:*
cisco firepower_threat_defense 6.2.3.18 cpe:2.3:a:cisco:firepower_threat_defense:6.2.3.18:*:*:*:*:*:*:*
cisco firepower_threat_defense 6.4.0 cpe:2.3:a:cisco:firepower_threat_defense:6.4.0:*:*:*:*:*:*:*
cisco firepower_threat_defense 6.4.0.1 cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.1:*:*:*:*:*:*:*
cisco firepower_threat_defense 6.4.0.2 cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.2:*:*:*:*:*:*:*
cisco firepower_threat_defense 6.4.0.3 cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.3:*:*:*:*:*:*:*
cisco firepower_threat_defense 6.4.0.4 cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.4:*:*:*:*:*:*:*
cisco firepower_threat_defense 6.4.0.5 cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.5:*:*:*:*:*:*:*
cisco firepower_threat_defense 6.4.0.6 cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.6:*:*:*:*:*:*:*
cisco firepower_threat_defense 6.4.0.7 cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.7:*:*:*:*:*:*:*
cisco firepower_threat_defense 6.4.0.8 cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.8:*:*:*:*:*:*:*
cisco firepower_threat_defense 6.4.0.9 cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.9:*:*:*:*:*:*:*
cisco firepower_threat_defense 6.4.0.10 cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.10:*:*:*:*:*:*:*
cisco firepower_threat_defense 6.4.0.11 cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.11:*:*:*:*:*:*:*
cisco firepower_threat_defense 6.4.0.12 cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.12:*:*:*:*:*:*:*
cisco firepower_threat_defense 6.4.0.13 cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.13:*:*:*:*:*:*:*
cisco firepower_threat_defense 6.4.0.14 cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.14:*:*:*:*:*:*:*
cisco firepower_threat_defense 6.4.0.15 cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.15:*:*:*:*:*:*:*
cisco firepower_threat_defense 6.4.0.16 cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.16:*:*:*:*:*:*:*
cisco firepower_threat_defense 6.4.0.17 cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.17:*:*:*:*:*:*:*
cisco firepower_threat_defense 6.4.0.18 cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.18:*:*:*:*:*:*:*
cisco firepower_threat_defense 6.6.0 cpe:2.3:a:cisco:firepower_threat_defense:6.6.0:*:*:*:*:*:*:*
cisco firepower_threat_defense 6.6.0.1 cpe:2.3:a:cisco:firepower_threat_defense:6.6.0.1:*:*:*:*:*:*:*
cisco firepower_threat_defense 6.6.1 cpe:2.3:a:cisco:firepower_threat_defense:6.6.1:*:*:*:*:*:*:*
cisco firepower_threat_defense 6.6.3 cpe:2.3:a:cisco:firepower_threat_defense:6.6.3:*:*:*:*:*:*:*
cisco firepower_threat_defense 6.6.4 cpe:2.3:a:cisco:firepower_threat_defense:6.6.4:*:*:*:*:*:*:*
cisco firepower_threat_defense 6.6.5 cpe:2.3:a:cisco:firepower_threat_defense:6.6.5:*:*:*:*:*:*:*
cisco firepower_threat_defense 6.6.5.1 cpe:2.3:a:cisco:firepower_threat_defense:6.6.5.1:*:*:*:*:*:*:*
cisco firepower_threat_defense 6.6.5.2 cpe:2.3:a:cisco:firepower_threat_defense:6.6.5.2:*:*:*:*:*:*:*
cisco firepower_threat_defense 6.6.7 cpe:2.3:a:cisco:firepower_threat_defense:6.6.7:*:*:*:*:*:*:*
cisco firepower_threat_defense 6.6.7.1 cpe:2.3:a:cisco:firepower_threat_defense:6.6.7.1:*:*:*:*:*:*:*
cisco firepower_threat_defense 6.6.7.2 cpe:2.3:a:cisco:firepower_threat_defense:6.6.7.2:*:*:*:*:*:*:*
cisco firepower_threat_defense 6.7.0 cpe:2.3:a:cisco:firepower_threat_defense:6.7.0:*:*:*:*:*:*:*
cisco firepower_threat_defense 6.7.0.1 cpe:2.3:a:cisco:firepower_threat_defense:6.7.0.1:*:*:*:*:*:*:*
cisco firepower_threat_defense 6.7.0.2 cpe:2.3:a:cisco:firepower_threat_defense:6.7.0.2:*:*:*:*:*:*:*
cisco firepower_threat_defense 6.7.0.3 cpe:2.3:a:cisco:firepower_threat_defense:6.7.0.3:*:*:*:*:*:*:*
cisco firepower_threat_defense 7.0.0 cpe:2.3:a:cisco:firepower_threat_defense:7.0.0:*:*:*:*:*:*:*
cisco firepower_threat_defense 7.0.0.1 cpe:2.3:a:cisco:firepower_threat_defense:7.0.0.1:*:*:*:*:*:*:*
cisco firepower_threat_defense 7.0.1 cpe:2.3:a:cisco:firepower_threat_defense:7.0.1:*:*:*:*:*:*:*
cisco firepower_threat_defense 7.0.1.1 cpe:2.3:a:cisco:firepower_threat_defense:7.0.1.1:*:*:*:*:*:*:*
cisco firepower_threat_defense 7.0.2 cpe:2.3:a:cisco:firepower_threat_defense:7.0.2:*:*:*:*:*:*:*
cisco firepower_threat_defense 7.0.2.1 cpe:2.3:a:cisco:firepower_threat_defense:7.0.2.1:*:*:*:*:*:*:*
cisco firepower_threat_defense 7.0.3 cpe:2.3:a:cisco:firepower_threat_defense:7.0.3:*:*:*:*:*:*:*
cisco firepower_threat_defense 7.0.4 cpe:2.3:a:cisco:firepower_threat_defense:7.0.4:*:*:*:*:*:*:*
cisco firepower_threat_defense 7.0.5 cpe:2.3:a:cisco:firepower_threat_defense:7.0.5:*:*:*:*:*:*:*
cisco firepower_threat_defense 7.0.6 cpe:2.3:a:cisco:firepower_threat_defense:7.0.6:*:*:*:*:*:*:*
cisco firepower_threat_defense 7.0.6.1 cpe:2.3:a:cisco:firepower_threat_defense:7.0.6.1:*:*:*:*:*:*:*
cisco firepower_threat_defense 7.0.6.2 cpe:2.3:a:cisco:firepower_threat_defense:7.0.6.2:*:*:*:*:*:*:*
cisco firepower_threat_defense 7.1.0 cpe:2.3:a:cisco:firepower_threat_defense:7.1.0:*:*:*:*:*:*:*
cisco firepower_threat_defense 7.1.0.1 cpe:2.3:a:cisco:firepower_threat_defense:7.1.0.1:*:*:*:*:*:*:*
cisco firepower_threat_defense 7.1.0.2 cpe:2.3:a:cisco:firepower_threat_defense:7.1.0.2:*:*:*:*:*:*:*
cisco firepower_threat_defense 7.1.0.3 cpe:2.3:a:cisco:firepower_threat_defense:7.1.0.3:*:*:*:*:*:*:*
cisco firepower_threat_defense 7.2.0 cpe:2.3:a:cisco:firepower_threat_defense:7.2.0:*:*:*:*:*:*:*
cisco firepower_threat_defense 7.2.0.1 cpe:2.3:a:cisco:firepower_threat_defense:7.2.0.1:*:*:*:*:*:*:*
cisco firepower_threat_defense 7.2.1 cpe:2.3:a:cisco:firepower_threat_defense:7.2.1:*:*:*:*:*:*:*
cisco firepower_threat_defense 7.2.2 cpe:2.3:a:cisco:firepower_threat_defense:7.2.2:*:*:*:*:*:*:*
cisco firepower_threat_defense 7.2.3 cpe:2.3:a:cisco:firepower_threat_defense:7.2.3:*:*:*:*:*:*:*
cisco firepower_threat_defense 7.2.4 cpe:2.3:a:cisco:firepower_threat_defense:7.2.4:*:*:*:*:*:*:*
cisco firepower_threat_defense 7.2.4.1 cpe:2.3:a:cisco:firepower_threat_defense:7.2.4.1:*:*:*:*:*:*:*
cisco firepower_threat_defense 7.2.5 cpe:2.3:a:cisco:firepower_threat_defense:7.2.5:*:*:*:*:*:*:*
cisco firepower_threat_defense 7.2.5.1 cpe:2.3:a:cisco:firepower_threat_defense:7.2.5.1:*:*:*:*:*:*:*
cisco firepower_threat_defense 7.2.5.2 cpe:2.3:a:cisco:firepower_threat_defense:7.2.5.2:*:*:*:*:*:*:*
cisco firepower_threat_defense 7.2.6 cpe:2.3:a:cisco:firepower_threat_defense:7.2.6:*:*:*:*:*:*:*

References for CVE-2024-20407

cvelogic Threat Intelligence