CVE-2021-34699 : Exploit Details and Defense Strategies
Learn about CVE-2021-34699, a vulnerability in Cisco IOS and Cisco IOS XE Software that allows a remote attacker to cause a denial of service condition. Find out the impact, technical details, and mitigation steps.
A vulnerability in the TrustSec CLI parser of Cisco IOS and Cisco IOS XE Software has been identified, allowing an attacker to cause a denial of service (DoS) condition on affected devices. Here is what you need to know about CVE-2021-34699.
Understanding CVE-2021-34699
This section provides an overview of the vulnerability, its impact, technical details, and mitigation steps.
What is CVE-2021-34699?
The vulnerability in the TrustSec CLI parser of Cisco IOS and Cisco IOS XE Software permits an authenticated remote attacker to reload an affected device by exploiting an improper interaction between the web UI and the CLI parser.
The Impact of CVE-2021-34699
A successful exploit could lead to a denial of service (DoS) condition on the device. The attacker can trigger the device to reload, causing disruption in services.
Technical Details of CVE-2021-34699
Here, we delve into the specifics of the vulnerability affecting Cisco IOS and Cisco IOS XE Software.
Vulnerability Description
The vulnerability arises due to an improper interaction between the web UI and the CLI parser, enabling the execution of a specific CLI command through the web UI, leading to a device reload.
Affected Systems and Versions
The vulnerability affects Cisco IOS and Cisco IOS XE Software. Versions susceptible to this vulnerability are unspecified.
Exploitation Mechanism
An attacker with authentication can exploit this vulnerability by requesting a particular CLI command through the web UI, prompting the affected device to reload.
Mitigation and Prevention
To safeguard your systems from CVE-2021-34699, follow these recommendations.
Immediate Steps to Take
Ensure timely patching, restrict CLI access, and monitor for unusual system behavior to detect any exploitation attempts.
Long-Term Security Practices
Implement network segmentation, access control policies, and regular security audits to enhance overall security posture.
Patching and Updates
Stay informed about security advisories from Cisco and apply patches promptly to mitigate the risk of exploitation.