// For flags

CVE-2020-3561

Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software WebVPN CRLF Injection Vulnerability

Severity Score

4.7
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Track
*SSVC
Descriptions

A vulnerability in the Clientless SSL VPN (WebVPN) of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to inject arbitrary HTTP headers in the responses of the affected system. The vulnerability is due to improper input sanitization. An attacker could exploit this vulnerability by persuading a user of the interface to click a crafted link. A successful exploit could allow the attacker to conduct a CRLF injection attack, adding arbitrary HTTP headers in the responses of the system and redirecting the user to arbitrary websites.

Una vulnerabilidad en el Clientless SSL VPN (WebVPN) de Cisco Adaptive Security Appliance (ASA) Software y Cisco Firepower Threat Defense (FTD) Software, podría permitir a un atacante remoto no autenticado inyectar encabezados HTTP arbitrarios en las respuestas del sistema afectado. La vulnerabilidad es debido a un saneamiento de entrada inapropiada. Un atacante podría explotar esta vulnerabilidad al persuadir a un usuario de la interfaz para que haga clic en un enlace diseñado. Una explotación con éxito podría permitir a un atacante conducir un ataque de inyección CRLF, agregando encabezados HTTP arbitrarios en las respuestas del sistema y redireccionando al usuario a sitios web arbitrarios

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
None
Integrity
Low
Availability
None
Attack Vector
Network
Attack Complexity
Medium
Authentication
None
Confidentiality
None
Integrity
Partial
Availability
None
* Common Vulnerability Scoring System
SSVC
  • Decision:Track
Exploitation
None
Automatable
No
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2019-12-12 CVE Reserved
  • 2020-10-21 CVE Published
  • 2023-10-25 EPSS Updated
  • 2024-11-13 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
  • CWE-93: Improper Neutralization of CRLF Sequences ('CRLF Injection')
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"
< 9.6.4.35
Search vendor "Cisco" for product "Adaptive Security Appliance" and version " < 9.6.4.35"
-
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 < 9.8.4.20
Search vendor "Cisco" for product "Adaptive Security Appliance Software" and version " >= 9.8.0 < 9.8.4.20"
-
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 < 9.10.1.43
Search vendor "Cisco" for product "Adaptive Security Appliance Software" and version " >= 9.10.0 < 9.10.1.43"
-
Affected
Cisco
Search vendor "Cisco"
Adaptive Security Appliance Software
Search vendor "Cisco" for product "Adaptive Security Appliance Software"
>= 9.12.0 < 9.12.3.9
Search vendor "Cisco" for product "Adaptive Security Appliance Software" and version " >= 9.12.0 < 9.12.3.9"
-
Affected
Cisco
Search vendor "Cisco"
Adaptive Security Appliance Software
Search vendor "Cisco" for product "Adaptive Security Appliance Software"
>= 9.13.0 < 9.13.1.10
Search vendor "Cisco" for product "Adaptive Security Appliance Software" and version " >= 9.13.0 < 9.13.1.10"
-
Affected
Cisco
Search vendor "Cisco"
Adaptive Security Appliance Software
Search vendor "Cisco" for product "Adaptive Security Appliance Software"
>= 9.14.0 < 9.14.1.10
Search vendor "Cisco" for product "Adaptive Security Appliance Software" and version " >= 9.14.0 < 9.14.1.10"
-
Affected