PT-2021-6141 · Cisco · Cisco Nx-Os+1

Published 2021-11-02 · Updated 2022-03-02 · CVE-2022-20623

Positive Technologies (AI Summary)

CVSS v3.1

8.6

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Cisco NX-OS Software for Cisco Nexus 9000 Series Switches (affected versions not specified)

Description The issue is related to a logic error in the Bidirectional Forwarding Detection (BFD) rate limiter functionality, which could allow an unauthenticated, remote attacker to cause BFD traffic to be dropped on an affected device. This can result in BFD session flaps, leading to route instability and dropped traffic, and ultimately a denial of service (DoS) condition. The vulnerability applies to both IPv4 and IPv6 traffic. An attacker could exploit this by sending a crafted stream of traffic through the device.

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:2022-01006

CVE-2022-20623

Affected Products

Cisco Nx-Os

Cisco Nexus

References · 11

• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-bfd-dos-wGQXrzxn · Vendor Advisory
• https://safe-surf.ru/specialists/bulletins-nkcki/675932 · Security Note
• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-bfd-dos-wGQXrzxn · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2022-20623 · Security Note
• https://bdu.fstec.ru/vul/2022-01006 · Security Note
• https://osv.dev/vulnerability/CVE-2022-20623 · Vendor Advisory
• https://vuldb.com/ru/?id.193656 · Note
• https://t.me/cibsecurity/37957 · Telegram Post
• https://t.me/cvenotify/27236 · Telegram Post
• https://t.me/true_secator/2670 · Telegram Post
• https://t.me/isacarusec/5086 · Telegram Post