PT-2021-4131 · Cisco · Cisco Ios Xr

Published 2021-09-08 · Updated 2021-09-21 · CVE-2021-34713

Positive Technologies (AI Summary)

CVSS v3.1

7.4

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Cisco IOS XR Software (affected versions not specified)

Description A vulnerability in the Layer 2 punt code of Cisco IOS XR Software running on Cisco ASR 9000 Series Aggregation Services Routers could allow an unauthenticated, adjacent attacker to cause the affected line card to reboot. This vulnerability is due to incorrect handling of specific Ethernet frames that cause a spin loop that can make the network processors unresponsive. An attacker could exploit this vulnerability by sending specific types of Ethernet frames on the segment where the affected line cards are attached. A successful exploit could allow the attacker to cause the affected line card to reboot.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Weakness Enumeration

CWE-399

Related Identifiers

BDU:2021-04723

CVE-2021-34713

Affected Products

Cisco Ios Xr

References · 6

• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-npspin-QYpwdhFD · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-34713 · Security Note
• https://osv.dev/vulnerability/CVE-2021-34713 · Vendor Advisory
• https://bdu.fstec.ru/vul/2021-04723 · Security Note
• https://t.me/cibsecurity/28558 · Telegram Post
• https://t.me/cvenotify/21239 · Telegram Post