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CVE-2021-34720

HIGH CVSS: 8.6 Published: 2021-09-09 Modified: 2026-06-17

Description

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 Platforms

Cisco Ncs 4016Cisco 8101-32FhCisco Ncs 5002Cisco 8818Cisco 8804Cisco Asr 9006Cisco Ncs 540 FronthaulCisco 8201-32FhCisco Ncs 5011Cisco Asr 9904

Weakness Type

CWE-771, NVD-CWE-Other

References