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8.6
HIGH CVSS 3.1
CVE-2024-20339
Cisco Firepower FTD TLS Denial of Service Vulnerability
Description

A vulnerability in the TLS processing feature of Cisco Firepower Threat Defense (FTD) Software for Cisco Firepower 2100 Series could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to an issue that occurs when TLS traffic is processed. An attacker could exploit this vulnerability by sending certain TLS traffic over IPv4 through an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition and impacting traffic to and through the affected device.

INFO

Published Date :

Oct. 23, 2024, 5:15 p.m.

Last Modified :

Aug. 8, 2025, 4:10 p.m.

Remotely Exploit :

Yes !

Source :

[email protected]
Affected Products

The following products are affected by CVE-2024-20339 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Cisco firepower_threat_defense
2 Cisco firepower_threat_defense_software
: Total Affected Vendor : 1 | Products : 2
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 3.1 HIGH [email protected]
CVSS 3.1 HIGH [email protected]
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2024-20339.

URL Resource
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc-xss-M446vbEO Broken Link
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-tls-dos-QXYE5Ufy Vendor Advisory
https://sec.cloudapps.cisco.com/security/center/viewErp.x?alertId=ERP-75300 Vendor Advisory
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2024-20339 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2024-20339 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2024-20339 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2024-20339 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • Initial Analysis by [email protected]

    Aug. 08, 2025

    Action Type Old Value New Value
    Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    Added CPE Configuration OR *cpe:2.3:a:cisco:firepower_threat_defense_software:6.2.3:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:6.2.3.1:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:6.2.3.2:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:6.2.3.3:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:6.2.3.4:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:6.2.3.5:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:6.2.3.9:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:6.2.3.10:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:6.2.3.15:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:6.2.3.6:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:6.2.3.7:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:6.2.3.12:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:6.2.3.11:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:6.2.3.13:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:6.2.3.8:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:6.2.3.14:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:6.2.3.16:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:6.2.3.17:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:6.4.0:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:6.4.0.3:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:6.4.0.4:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:6.4.0.6:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:6.4.0.1:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:6.4.0.5:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:6.4.0.2:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:6.4.0.8:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:6.4.0.7:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:6.6.0:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:6.4.0.9:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:6.6.0.1:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:6.6.1:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:6.4.0.10:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:6.4.0.11:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:6.6.3:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:6.6.4:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:6.4.0.12:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:6.6.5:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:6.6.5.1:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:6.2.3.18:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:6.6.5.2:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:6.6.7:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:6.6.7.1:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:6.7.0:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:6.7.0.1:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:6.7.0.2:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:7.0.0:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:7.0.0.1:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:7.0.1:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:7.1.0:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:6.4.0.13:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:7.0.1.1:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:6.7.0.3:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:6.4.0.14:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:7.1.0.1:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:7.0.2:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:6.4.0.15:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:7.2.0:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:7.0.2.1:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:7.0.3:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:7.2.0.1:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:7.0.4:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:7.2.1:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:7.0.5:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:6.4.0.16:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:7.3.0:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:7.2.2:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:7.2.3:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:7.3.1:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:7.1.0.3:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:7.2.4:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:7.0.6:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:7.2.5:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:7.2.4.1:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:7.3.1.1:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:6.4.0.17:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:7.0.6.1:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:7.2.5.1:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:6.6.7.2:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:7.2.5.2:*:*:*:*:*:*:* *cpe:2.3:a:cisco:firepower_threat_defense_software:7.3.1.2:*:*:*:*:*:*:*
    Added Reference Type Cisco Systems, Inc.: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc-xss-M446vbEO Types: Broken Link
    Added Reference Type Cisco Systems, Inc.: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-tls-dos-QXYE5Ufy Types: Vendor Advisory
    Added Reference Type Cisco Systems, Inc.: https://sec.cloudapps.cisco.com/security/center/viewErp.x?alertId=ERP-75300 Types: Vendor Advisory
  • CVE Received by [email protected]

    Oct. 23, 2024

    Action Type Old Value New Value
    Added Description A vulnerability in the TLS processing feature of Cisco Firepower Threat Defense (FTD) Software for Cisco Firepower 2100 Series could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to an issue that occurs when TLS traffic is processed. An attacker could exploit this vulnerability by sending certain TLS traffic over IPv4 through an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition and impacting traffic to and through the affected device.
    Added Reference Cisco Systems, Inc. https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-tls-dos-QXYE5Ufy [No types assigned]
    Added Reference Cisco Systems, Inc. https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc-xss-M446vbEO [No types assigned]
    Added Reference Cisco Systems, Inc. https://sec.cloudapps.cisco.com/security/center/viewErp.x?alertId=ERP-75300 [No types assigned]
    Added CWE Cisco Systems, Inc. CWE-476
    Added CVSS V3.1 Cisco Systems, Inc. AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Vulnerability Scoring Details
Base CVSS Score: 8.6
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact