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Rewterz Threat Advisory – CVE-2021-34720 – Cisco IOS Software Security Vulnerability

Severity

High

Analysis Summary

CVE-2021-34720

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. 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.

Impact

  • Denial of Service
  • Unauthorized Access

Affected Vendors

Cisco

Affected Products

  • Cisco IOS XR Software

Remediation

Refer to Cisco Security Advisory for the patch, upgrade, or suggested workaround information.

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ipsla-ZA3SRrpP