PT-2021-4321 · Cisco · Cisco Ios Xe

Published 2021-09-22 · Updated 2023-05-22 · CVE-2021-1621

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 XE Software (affected versions not specified)

Description A vulnerability in the Layer 2 punt code could allow an unauthenticated, adjacent attacker to cause a queue wedge on an interface that receives specific Layer 2 frames, resulting in a denial of service (DoS) condition. This is due to improper handling of certain Layer 2 frames. An attacker could exploit this by sending specific Layer 2 frames on the segment the router is connected to, causing a queue wedge on the interface and resulting in a DoS condition.

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

DoS

Weakness Enumeration

CWE-399

Related Identifiers

BDU:2021-04936

CVE-2021-1621

Affected Products

Cisco Ios Xe

References · 7

• https://nvd.nist.gov/vuln/detail/CVE-2021-1621 · Security Note
• https://safe-surf.ru/specialists/bulletins-nkcki/669675 · Security Note
• https://bdu.fstec.ru/vul/2021-04936 · Security Note
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-quewedge-69BsHUBW · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-1621 · Vendor Advisory
• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-quewedge-69BsHUBW · Vendor Advisory
• https://t.me/cvenotify/21948 · Telegram Post