QID 317234

Date Published: 2022-10-10

QID 317234: Cisco Internetwork Operating System (IOS) XE Software for Catalyst Switches MPLS Denial of Service (DoS) Vulnerability (cisco-sa-iosxe-mpls-dos-Ab4OUL3)

A vulnerability in the egress MPLS packet processing function of Cisco IOS XE Software for Cisco Catalyst 3650, Catalyst 3850, and Catalyst 9000 Family Switches could allow an unauthenticated, remote attacker to cause an affected device to reload unexpectedly, resulting in a denial of service (DoS) condition.

Affected Products:
This vulnerability affects the following Cisco products if they are running a vulnerable release of Cisco IOS XE Software and have MPLS configured:
Catalyst 3650 Series Switches
Catalyst 3850 Series Switches
Catalyst 9300 Series Switches
Catalyst 9400 Series Switches
Catalyst 9500 Series Switches
Catalyst 9600 Series Switches
QID Detection Logic (Authenticated): The check matches Cisco IOS XE version retrieved via Unix Auth using "show version" command. QID Detection Logic (Unauthenticated): The check matches Cisco IOS XE version retrieved via SNMP or TCP/IP Fingerprint or NTP or Telnet.

A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.

  • CVSS V3 rated as Critical - 8.6 severity.
  • CVSS V2 rated as High - 7.8 severity.
    • Solution

    Customers are advised to refer to cisco-sa-iosxe-mpls-dos-Ab4OUL3 for more information.

    Vendor References

    CVEs related to QID 317234

    CVE-2022-20870 |
    Software Advisories
    Advisory ID Software Component Link
    cisco-sa-iosxe-mpls-dos-Ab4OUL3 URL Logo tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-mpls-dos-Ab4OUL3
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