// For flags

CVE-2019-1817

Cisco Web Security Appliance Malformed Request 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 web proxy functionality of Cisco AsyncOS Software for Cisco Web Security Appliance could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to improper validation of HTTP and HTTPS requests. An attacker could exploit this vulnerability by sending a malformed HTTP or HTTPS request to an affected device. An exploit could allow the attacker to cause a restart of the web proxy process, resulting in a temporary DoS condition.

Una vulnerabilidad en la funcionalidad web proxy de Cisco AsyncOS Software para Cisco Web Security Appliance, podría permitir que un atacante remoto no identificado cause una condición de Denegación de Servicio (DoS) en un dispositivo afectado. La vulnerabilidad es debido a la comprobación inapropiada de las peticiones HTTP y HTTPS. Un atacante podría aprovechar esta vulnerabilidad mediante el envio de una petición HTTP o HTTPS malformada a un dispositivo afectado. Una operación con éxito podría permitir al atacante causar un reinicio del proceso web proxy, resultando en una condición de DoS temporal.

*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:Attend
Exploitation
None
Automatable
Yes
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2018-12-06 CVE Reserved
  • 2019-05-03 CVE Published
  • 2023-07-08 EPSS Updated
  • 2024-11-19 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-20: Improper Input Validation
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"
 Web Security Appliance
Search vendor "Cisco" for product "Web Security Appliance"
 11.5.1-fcs-115
Search vendor "Cisco" for product "Web Security Appliance" and version "11.5.1-fcs-115"
-
Affected
Cisco
Search vendor "Cisco"
 Web Security Appliance
Search vendor "Cisco" for product "Web Security Appliance"
 11.5.1-fcs-124
Search vendor "Cisco" for product "Web Security Appliance" and version "11.5.1-fcs-124"
-
Affected
Cisco
Search vendor "Cisco"
 Web Security Appliance
Search vendor "Cisco" for product "Web Security Appliance"
 11.5.1-fcs-125
Search vendor "Cisco" for product "Web Security Appliance" and version "11.5.1-fcs-125"
-
Affected
Cisco
Search vendor "Cisco"
 Web Security Appliance
Search vendor "Cisco" for product "Web Security Appliance"
 11.7.0-fcs-334
Search vendor "Cisco" for product "Web Security Appliance" and version "11.7.0-fcs-334"
-
Affected