CVE-2021-34697 MEDIUM

CVE-2021-34697: Cisco IOS XE Software Protection Against Distributed Denial of Service Attacks Feature Vulnerability

Vendor Cisco
Product Cisco IOS XE Software
Weakness CWE-665
Published September 23, 2021
Last update November 7, 2024

CVSS base score

5.8/10
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:L

What the vulnerability does

01Description

A vulnerability in the Protection Against Distributed Denial of Service Attacks feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to conduct denial of service (DoS) attacks to or through the affected device. This vulnerability is due to incorrect programming of the half-opened connections limit, TCP SYN flood limit, or TCP SYN cookie features when the features are configured in vulnerable releases of Cisco IOS XE Software. An attacker could exploit this vulnerability by attempting to flood traffic to or through the affected device. A successful exploit could allow the attacker to initiate a DoS attack to or through an affected device.

Key dates

02Disclosure timeline

September 23, 2021 CVE published
November 7, 2024 Record updated