CVE-2021-34698 HIGH

CVE-2021-34698: Cisco Web Security Appliance Proxy Service Denial of Service Vulnerability

Vendor Cisco
Product Cisco Web Security Appliance (WSA)
Weakness CWE-401
Published October 6, 2021
Last update November 7, 2024

CVSS base score

8.6/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality None
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

What the vulnerability does

01Description

A vulnerability in the proxy service of Cisco AsyncOS for Cisco Web Security Appliance (WSA) could allow an unauthenticated, remote attacker to exhaust system memory and cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper memory management in the proxy service of an affected device. An attacker could exploit this vulnerability by establishing a large number of HTTPS connections to the affected device. A successful exploit could allow the attacker to cause the system to stop processing new connections, which could result in a DoS condition. Note: Manual intervention may be required to recover from this situation.

Key dates

02Disclosure timeline

October 6, 2021 CVE published
November 7, 2024 Record updated