// For flags

CVE-2020-3529

Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software SSL VPN Direct Memory Access 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

-
*SSVC
Descriptions

A vulnerability in the SSL VPN negotiation process for Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a reload of an affected device, resulting in a denial of service (DoS) condition. The vulnerability is due to inefficient direct memory access (DMA) memory management during the negotiation phase of an SSL VPN connection. An attacker could exploit this vulnerability by sending a steady stream of crafted Datagram TLS (DTLS) traffic to an affected device. A successful exploit could allow the attacker to exhaust DMA memory on the device and cause a DoS condition.

Una vulnerabilidad en el proceso de negociación de SSL VPN para Cisco Adaptive Security Appliance (ASA) Software y Cisco Firepower Threat Defense (FTD) Software, podría permitir a un atacante remoto no autenticado causar una recarga de un dispositivo afectado, resultando en una condición de denegación de servicio (DoS). La vulnerabilidad es debido a una gestión de memoria direct memory access (DMA) ineficiente durante la fase de negociación de una conexión VPN SSL. Un atacante podría explotar esta vulnerabilidad mediante el envío de un flujo constante de tráfico Datagram TLS (DTLS) diseñado a un dispositivo afectado. Una explotación con éxito podría permitir a un atacante agotar la memoria DMA en el dispositivo y causar una condición de DoS

*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
Partial
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2019-12-12 CVE Reserved
  • 2020-10-21 CVE Published
  • 2023-07-07 EPSS Updated
  • 2024-09-17 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-400: Uncontrolled Resource Consumption
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"
Adaptive Security Appliance
Search vendor "Cisco" for product "Adaptive Security Appliance"
< 9.6.4.45
Search vendor "Cisco" for product "Adaptive Security Appliance" and version " < 9.6.4.45"
-
Affected
Cisco
Search vendor "Cisco"
Firepower Threat Defense
Search vendor "Cisco" for product "Firepower Threat Defense"
< 6.3.0.6
Search vendor "Cisco" for product "Firepower Threat Defense" and version " < 6.3.0.6"
-
Affected
Cisco
Search vendor "Cisco"
Firepower Threat Defense
Search vendor "Cisco" for product "Firepower Threat Defense"
>= 6.4.0 < 6.4.0.10
Search vendor "Cisco" for product "Firepower Threat Defense" and version " >= 6.4.0 < 6.4.0.10"
-
Affected
Cisco
Search vendor "Cisco"
Firepower Threat Defense
Search vendor "Cisco" for product "Firepower Threat Defense"
>= 6.5.0 < 6.5.0.5
Search vendor "Cisco" for product "Firepower Threat Defense" and version " >= 6.5.0 < 6.5.0.5"
-
Affected
Cisco
Search vendor "Cisco"
Firepower Threat Defense
Search vendor "Cisco" for product "Firepower Threat Defense"
>= 6.6.0 < 6.6.1
Search vendor "Cisco" for product "Firepower Threat Defense" and version " >= 6.6.0 < 6.6.1"
-
Affected
Cisco
Search vendor "Cisco"
Adaptive Security Appliance Software
Search vendor "Cisco" for product "Adaptive Security Appliance Software"
>= 9.8.0 < 9.8.4.29
Search vendor "Cisco" for product "Adaptive Security Appliance Software" and version " >= 9.8.0 < 9.8.4.29"
-
Affected
Cisco
Search vendor "Cisco"
Adaptive Security Appliance Software
Search vendor "Cisco" for product "Adaptive Security Appliance Software"
>= 9.9.0 < 9.9.2.80
Search vendor "Cisco" for product "Adaptive Security Appliance Software" and version " >= 9.9.0 < 9.9.2.80"
-
Affected
Cisco
Search vendor "Cisco"
Adaptive Security Appliance Software
Search vendor "Cisco" for product "Adaptive Security Appliance Software"
>= 9.10.0 < 9.10.1.44
Search vendor "Cisco" for product "Adaptive Security Appliance Software" and version " >= 9.10.0 < 9.10.1.44"
-
Affected
Cisco
Search vendor "Cisco"
Adaptive Security Appliance Software
Search vendor "Cisco" for product "Adaptive Security Appliance Software"
>= 9.12.0 < 9.12.4.4
Search vendor "Cisco" for product "Adaptive Security Appliance Software" and version " >= 9.12.0 < 9.12.4.4"
-
Affected
Cisco
Search vendor "Cisco"
Adaptive Security Appliance Software
Search vendor "Cisco" for product "Adaptive Security Appliance Software"
>= 9.13.0 < 9.13.1.13
Search vendor "Cisco" for product "Adaptive Security Appliance Software" and version " >= 9.13.0 < 9.13.1.13"
-
Affected
Cisco
Search vendor "Cisco"
Adaptive Security Appliance Software
Search vendor "Cisco" for product "Adaptive Security Appliance Software"
>= 9.14.0 < 9.14.1.30
Search vendor "Cisco" for product "Adaptive Security Appliance Software" and version " >= 9.14.0 < 9.14.1.30"
-
Affected