// For flags

CVE-2020-3191

Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software IPv6 DNS Denial of Service Vulnerability

Severity Score

8.6
*CVSS v3.1

Exploit Likelihood

1%
*EPSS

Affected Versions

32
*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Attend
*SSVC
Descriptions

A vulnerability in DNS over IPv6 packet processing for Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the device to unexpectedly reload, resulting in a denial of service (DoS) condition. The vulnerability is due to improper length validation of a field in an IPv6 DNS packet. An attacker could exploit this vulnerability by sending a crafted DNS query over IPv6, which traverses the affected device. An exploit could allow the attacker to cause the device to reload, resulting in a DoS condition. This vulnerability is specific to DNS over IPv6 traffic only.

Una vulnerabilidad en el procesamiento de paquetes DNS sobre IPv6 para el Cisco Adaptive Security Appliance (ASA) Software y el Firepower Threat Defense (FTD) Software, podría permitir a un atacante remoto no autenticado causar que el dispositivo se sobrecargue inesperadamente, resultando en una condición de denegación de servicio (DoS). La vulnerabilidad es debido a una comprobación inapropiada de la longitud de un campo en un paquete DNS IPv6. Un atacante podría explotar esta vulnerabilidad mediante el envío de una consulta DNS sobre IPv6 diseñada, que atraviesa el dispositivo afectado. Una explotación podría permitir al atacante causar que el dispositivo se sobrecargue, resultando en una condición DoS. Esta vulnerabilidad es específica solo de DNS sobre el tráfico IPv6.

*Credits: N/A
CVSS Scores
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
Partial
* Common Vulnerability Scoring System
SSVC
  • Decision:Attend
Exploitation
None
Automatable
Yes
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2019-12-12 CVE Reserved
  • 2020-05-06 CVE Published
  • 2024-11-15 CVE Updated
  • 2025-03-30 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-20: Improper Input Validation
CAPEC
References (1)
Affected Vendors, Products, and Versions (32)