// For flags

CVE-2022-20767

Cisco Firepower Threat Defense Software DNS Enforcement Denial of Service Vulnerability

Severity Score

7.5
*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 Snort rule evaluation function of Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to improper handling of the DNS reputation enforcement rule. An attacker could exploit this vulnerability by sending crafted UDP packets through an affected device to force a buildup of UDP connections. A successful exploit could allow the attacker to cause traffic that is going through the affected device to be dropped, resulting in a DoS condition. Note: This vulnerability only affects Cisco FTD devices that are running Snort 3.

Una vulnerabilidad en la función de evaluación de reglas Snort del software Cisco Firepower Threat Defense (FTD) podría permitir a un atacante remoto no autenticado causar una condición de denegación de servicio (DoS) en un dispositivo afectado. La vulnerabilidad es debido a un manejo inapropiado de la regla de aplicación de la reputación DNS. Un atacante podría explotar esta vulnerabilidad mediante el envío de paquetes UDP diseñados a través de un dispositivo afectado para forzar una acumulación de conexiones UDP. Una explotación con éxito podría permitir al atacante causar un bloqueo del tráfico que pasa por el dispositivo afectado, resultando en una condición de DoS. Nota: Esta vulnerabilidad sólo afecta a dispositivos Cisco FTD que ejecutan Snort 3

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
None
Availability
High
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
None
Integrity
None
Availability
Complete
* Common Vulnerability Scoring System
SSVC
  • Decision:Attend
Exploitation
None
Automatable
Yes
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2021-11-02 CVE Reserved
  • 2022-05-03 CVE Published
  • 2023-11-23 EPSS Updated
  • 2024-11-06 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-399: Resource Management Errors
  • CWE-770: Allocation of Resources Without Limits or Throttling
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"
 < 7.0.2
Search vendor "Cisco" for product "Firepower Threat Defense" and version " < 7.0.2"
-
Affected
Cisco
Search vendor "Cisco"
 Firepower Threat Defense
Search vendor "Cisco" for product "Firepower Threat Defense"
 7.1.0
Search vendor "Cisco" for product "Firepower Threat Defense" and version "7.1.0"
-
Affected