Denial of service in Cisco IOS XE Software for Catalyst 9800 Series Wireless Controllers

1) Resource management error

EUVDB-ID: #VU56858

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-1611

CWE-ID: CWE-399 - Resource Management Errors

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to improper management of internal resources within the application in Ethernet over GRE (EoGRE) packet processing. A remote attacker can pass specially crafted data to the application and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Cisco IOS XE: 17.3.1 - 17.3.3

Catalyst 9800 Embedded Wireless Controller: All versions

Cisco Catalyst 9800 Series Wireless Controllers: All versions

Catalyst 9800 Wireless Controllers for Cloud: All versions

Embedded Wireless Controller on Catalyst Access Points: All versions

CPE2.3

• cpe:2.3:o:cisco_systems:cisco_ios_xe:17.3.1:*:*:*:*:*:*:*
• cpe:2.3:o:cisco_systems:cisco_ios_xe:17.3.3:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:catalyst_9800_embedded_wireless_controller:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_catalyst_9800_series_wireless_controllers:*:*:*:*:*:*:*:*
• cpe:2.3:a:cisco_systems:catalyst_9800_wireless_controllers_for_cloud:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:embedded_wireless_controller_on_catalyst_access_points:*:*:*:*:*:*:*:*

External links

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ewlc-gre-6u4ELzAT

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.