PT-2021-2179 · Cisco · Cisco Nx-Os+1

Published 2021-02-24 · Updated 2022-07-15 · CVE-2021-1387

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 (affected versions not specified)

Description A vulnerability in the network stack of Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability exists because the software improperly releases resources when it processes certain IPv6 packets that are destined to an affected device. An attacker could exploit this vulnerability by sending multiple crafted IPv6 packets to an affected device. A successful exploit could cause the network stack to run out of available buffers, impairing operations of control plane and management plane protocols and resulting in a DoS condition. Manual intervention would be required to restore normal operations on the affected device.

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

DoS

Memory Leak

Weakness Enumeration

CWE-401

Related Identifiers

BDU:2021-01086

CVE-2021-1387

Affected Products

Cisco Nx-Os

Cisco Nexus

References · 7

• https://safe-surf.ru/specialists/bulletins-nkcki/663606 · Security Note
• https://osv.dev/vulnerability/CVE-2021-1387 · Vendor Advisory
• https://bdu.fstec.ru/vul/2021-01086 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2021-1387 · Security Note
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-ipv6-netstack-edXPGV7K · Vendor Advisory
• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-ipv6-netstack-edXPGV7K · Vendor Advisory
• https://t.me/cibsecurity/24104 · Telegram Post