Vulnerability · Published Apr 6, 2022 · Assigned by cisco

CVE-2022-20784Cisco Web Security Appliance Filter Bypass Vulnerability

Medium 5.8

In plain English

A medium-severity improper input validation in Cisco Web Security Appliance (WSA) from Cisco. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 61% of all known vulnerabilities).

Severity (CVSS 3.1)5.8Medium

Exploit odds (30 days)0.9%top 39.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
Cisco	Cisco Web Security Appliance (WSA)	n/a

Weakness: CWE-20 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

References

20220406 Cisco Web Security Appliance Filter Bypass Vulnerability vendor-advisory, x_refsource_CISCO