// For flags

CVE-2022-20784

Cisco Web Security Appliance Filter Bypass Vulnerability

Severity Score

5.3
*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-Based Reputation Score (WBRS) engine of Cisco AsyncOS Software for Cisco Web Security Appliance (WSA) could allow an unauthenticated, remote attacker to bypass established web request policies and access blocked content on an affected device. This vulnerability is due to incorrect handling of certain character combinations inserted into a URL. An attacker could exploit this vulnerability by sending crafted URLs to be processed by an affected device. A successful exploit could allow the attacker to bypass the web proxy and access web content that has been blocked by policy.

Una vulnerabilidad en el motor Web-Based Reputation Score (WBRS) del software Cisco AsyncOS para Cisco Web Security Appliance (WSA) podría permitir a un atacante remoto no autenticado omitir las políticas de petición web establecidas y acceder a contenido bloqueado en un dispositivo afectado. Esta vulnerabilidad es debido al manejo incorrecto de determinadas combinaciones de caracteres insertadas en una URL. Un atacante podría explotar esta vulnerabilidad mediante el envío de URLs diseñadas para ser procesadas por un dispositivo afectado. Una explotación con éxito podría permitir al atacante omitir el proxy web y acceder al contenido web que ha sido bloqueado por la política

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
Low
Availability
None
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
Partial
Integrity
None
Availability
None
* 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
  • 2022-04-06 CVE Published
  • 2023-10-28 EPSS Updated
  • 2024-11-06 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"
 >= 11.7.0 < 14.0.2
Search vendor "Cisco" for product "Web Security Appliance" and version " >= 11.7.0 < 14.0.2"
-
Affected
in Cisco
Search vendor "Cisco"
 Web Security Appliance
Search vendor "Cisco" for product "Web Security Appliance"
--
Safe