PT-2021-4496 · Cisco · Cisco Nx-Os+1

Published 2021-08-25 · Updated 2021-09-05 · CVE-2021-1588

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 MPLS Operation, Administration, and Maintenance (OAM) feature could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This is due to improper input validation when an affected device is processing an MPLS echo-request or echo-reply packet. An attacker could exploit this by sending malicious MPLS echo-request or echo-reply packets to an interface enabled for MPLS forwarding on the affected device. A successful exploit could allow the attacker to cause the MPLS OAM process to crash and restart multiple times, causing the affected device to reload 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

Buffer Over-read

RCE

Out of bounds Read

Weakness Enumeration

CWE-126

CWE-20

CWE-125

Related Identifiers

BDU:2021-05130

CVE-2021-1588

Affected Products

Cisco Nx-Os

Cisco Nexus

References · 9

• https://bdu.fstec.ru/vul/2021-05130 · Security Note
• https://osv.dev/vulnerability/CVE-2021-1588 · Vendor Advisory
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-mpls-oam-dos-sGO9x5GM · Vendor Advisory
• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-mpls-oam-dos-sGO9x5GM · Vendor Advisory
• https://safe-surf.ru/specialists/bulletins-nkcki/668963 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2021-1588 · Security Note
• https://t.me/cvenotify/20102 · Telegram Post
• https://t.me/cybersecuritytechnologies/4232 · Telegram Post
• https://t.me/cvenotify/20628 · Telegram Post