// For flags

CVE-2019-1691

Cisco Firepower Threat Defense Software SSL or TLS Denial of Service Vulnerability

Severity Score

5.8
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Attend
*SSVC
Descriptions

A vulnerability in the detection engine of Cisco Firepower Threat Defense Software could allow an unauthenticated, remote attacker to cause the unexpected restart of the SNORT detection engine, resulting in a denial of service (DoS) condition. The vulnerability is due to the incomplete error handling of the SSL or TLS packet header during the connection establishment. An attacker could exploit this vulnerability by sending a crafted SSL or TLS packet during the connection handshake. An exploit could allow the attacker to cause the SNORT detection engine to unexpectedly restart, resulting in a partial DoS condition while the detection engine restarts. Versions prior to 6.2.3.4 are affected.

Una vulnerabilidad en el motor de detección del software Firepower Threat Defense de Cisco podría permitir a un atacante remoto no autenticado provocar el reinicio inesperado del motor de detección SNORT, conduciendo a una Denegación de Servicio (DoS). Esta vulnerabilidad se debe a la gestión de errores incompleta de la cabecera del paquete SSL o TLS durante el establecimiento de una conexión. Un atacante podría explotar esta vulnerabilidad enviando un paquete SSL o TLS manipulado durante el handshake de conexión. Si se explota con éxito, podría permitir que el atacante consiga que el motor de detección SNORT se reinicie inesperadamente, conduciendo a una condición DoS parcial durante el reinicio del motor de detección. Las versiones anteriores a la 6.2.3.4 se ven afectadas.

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
None
Availability
Low
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
None
Integrity
None
Availability
Partial
* Common Vulnerability Scoring System
SSVC
  • Decision:Attend
Exploitation
None
Automatable
Yes
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2018-12-06 CVE Reserved
  • 2019-02-21 CVE Published
  • 2024-07-13 EPSS Updated
  • 2024-11-19 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-20: Improper Input Validation
  • CWE-755: Improper Handling of Exceptional Conditions
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Cisco
Search vendor "Cisco"
 Firepower Threat Defense
Search vendor "Cisco" for product "Firepower Threat Defense"
 < 6.2.3.4
Search vendor "Cisco" for product "Firepower Threat Defense" and version " < 6.2.3.4"
-
Affected