CVE-2021-34720: Cisco IOS XR Software IP Service Level Agreements and Two-Way Active Measurement Protocol Denial of Service Vulnerability
A vulnerability in the IP Service Level Agreements (IP SLA) responder and Two-Way Active Measurement Protocol (TWAMP) features of Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause device packet memory to become exhausted or cause the IP SLA process to crash, resulting in a denial of service (DoS) condition. This vulnerability exists because socket creation failures are mishandled during the IP SLA and TWAMP processes. An attacker could exploit this vulnerability by sending specific IP SLA or TWAMP packets to an affected device. A successful exploit could allow the attacker to exhaust the packet memory, which will impact other processes, such as routing protocols, or crash the IP SLA process.
Affected Software
Event History
Frequently Asked Questions
What is the vulnerability ID?
The vulnerability ID is CVE-2021-34720.
What is the severity of CVE-2021-34720?
The severity of CVE-2021-34720 is high (8.6).
What software is affected by CVE-2021-34720?
Cisco IOS XR Software versions 6.2.3 to 6.3.2 and 6.5.0 to 7.2.2 are affected by CVE-2021-34720.
How can an attacker exploit CVE-2021-34720?
An attacker can exploit CVE-2021-34720 by sending specially crafted packets to the IP SLA responder or TWAMP features of Cisco IOS XR Software.
Is there a fix for CVE-2021-34720?
Yes, Cisco has released software updates to address the vulnerability. Please refer to the Cisco security advisory for more information.