Improper access control in Cisco IOS XR and Cisco Nexus 9000 Series Switches - CVE-2021-1389

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Main Vulnerability Database Vulnerabilities #VU50381

Improper access control in Cisco IOS XR and Cisco Nexus 9000 Series Switches - CVE-2021-1389

Published: February 4, 2021 / Updated: February 5, 2021


Vulnerability identifier: #VU50381
CSH Severity: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2021-1389
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vulnerable software:
Cisco IOS XR
Cisco Nexus 9000 Series Switches
Software vendor:
Cisco Systems, Inc

Description

The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to improper access restrictions when processing IPv6 traffic in Cisco IOS XR Software and Cisco NX-OS Software for certain Cisco devices. A remote attacker can bypass implemented ACLs with specially crafted IPv6 packets.

this vulnerability affected the following Cisco devices if they were running a vulnerable release of Cisco IOS XR Software or Cisco NX-OS Software and had IPv6 ACL configured:

  • Network Convergence System (NCS) 540 Series Routers
  • NCS 560 Series Routers
  • NCS 5500 Series
  • Nexus 3600 Platform Switches
  • Nexus 9500 R-Series Switching Platforms

Remediation

Install updates from vendor's website.

External links