CVE-2021-34720

published 2021-09-09

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…

Priority P3 48 high 8.6 CVSS 3.1

AV N AC L PR N UI N S C C N I N A H

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

5 ranges

Vendor	Product	Version range	Fixed in
cisco	cisco_ios_xr_software	—	—
cisco	ios_xr	< 6.2.3	6.2.3
cisco	ios_xr	—	—
cisco	ios_xr	>= 6.3.0 < 6.3.2	6.3.2
cisco	ios_xr	>= 6.5.0 < 7.2.2	7.2.2

CVSS provenance

nvd v3.1 8.6 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

nvd v2.0 4.3 MEDIUM AV:N/AC:M/Au:N/C:N/I:N/A:P

vendor_cisco 8.6 HIGH

Stop checking back — get the weekly exploitation signal.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.

CWE-771 CWE-400