PT-2021-13525 · Cisco · Cisco Nexus 9000 Series Fabric Switches

Published 2021-08-25 · Updated 2022-02-25 · CVE-2021-1586

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 Nexus 9000 Series Fabric Switches in Application Centric Infrastructure (ACI) mode (affected versions not specified)

Description: A vulnerability in the Multi-Pod or Multi-Site network configurations could allow an unauthenticated, remote attacker to unexpectedly restart the device, resulting in a denial of service (DoS) condition. This issue exists because TCP traffic sent to a specific port on an affected device is not properly sanitized. An attacker could exploit this by sending crafted TCP data to a specific port that is listening on a public-facing IP address for the Multi-Pod or Multi-Site configuration. A successful exploit could allow the attacker to cause the device to restart unexpectedly, resulting in a DoS condition.

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

Insufficient Verification of Data Authenticity

Weakness Enumeration

CWE-345

Related Identifiers

CVE-2021-1586

Affected Products

Cisco Nexus 9000 Series Fabric Switches

References · 6

• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-n9kaci-tcp-dos-YXukt6gM · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-1586 · Security Note
• https://osv.dev/vulnerability/CVE-2021-1586 · Vendor Advisory
• https://t.me/cvenotify/20104 · Telegram Post
• https://t.me/true_secator/2670 · Telegram Post
• https://t.me/isacarusec/5086 · Telegram Post