What is the severity of CVE-2021-34697?

The severity of CVE-2021-34697 is considered high due to the potential for remote denial of service attacks.

How do I fix CVE-2021-34697?

To fix CVE-2021-34697, upgrade your Cisco IOS XE software to the latest version beyond 17.3.3.

Who is affected by CVE-2021-34697?

Administrators using Cisco IOS XE versions between 17.3.1 and 17.3.3 are affected by CVE-2021-34697.

What types of attacks can CVE-2021-34697 lead to?

CVE-2021-34697 can lead to denial of service (DoS) attacks against or through affected Cisco devices.

Is CVE-2021-34697 an unauthenticated vulnerability?

Yes, CVE-2021-34697 is an unauthenticated vulnerability that allows remote attackers to exploit it without prior authentication.

Vulnerability/
CVE-2021-34697

high

8.6

CWE

665

23/9/2021

7/11/2024

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

First published: Thu Sep 23 2021(Updated: )

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.

Credit: ykramarz@cisco.com

Affected Software	Affected Version	How to fix
Cisco IOS XE Web UI	>=17.3.1<17.3.3

Never miss a vulnerability like this again

Reference Links

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-zbfw-tguGuYq

Frequently Asked Questions

What is the severity of CVE-2021-34697?
The severity of CVE-2021-34697 is considered high due to the potential for remote denial of service attacks.
How do I fix CVE-2021-34697?
To fix CVE-2021-34697, upgrade your Cisco IOS XE software to the latest version beyond 17.3.3.
Who is affected by CVE-2021-34697?
Administrators using Cisco IOS XE versions between 17.3.1 and 17.3.3 are affected by CVE-2021-34697.
What types of attacks can CVE-2021-34697 lead to?
CVE-2021-34697 can lead to denial of service (DoS) attacks against or through affected Cisco devices.
Is CVE-2021-34697 an unauthenticated vulnerability?
Yes, CVE-2021-34697 is an unauthenticated vulnerability that allows remote attackers to exploit it without prior authentication.

agent/type
agent/softwarecombine
agent/references
agent/title
agent/weakness
agent/author
agent/severity
agent/description
agent/first-publish-date
agent/event
collector/mitre-cve
source/MITRE
agent/last-modified-date
agent/source
agent/tags
collector/nvd-index
agent/software-canonical-lookup-request
vendor/cisco
canonical/cisco ios xe web ui
version/cisco ios xe web ui/17.3.1

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co

By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.