Main Vulnerability Database Vulnerabilities #VU56858

Resource management error in Cisco Systems, Inc products - CVE-2021-1611

Published: September 24, 2021

Vulnerability identifier: #VU56858

CSH Severity: Medium

CVSS v4: 8.7 [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]

CVE-ID: CVE-2021-1611

CWE-ID: CWE-399

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerability details

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.

Affected software

Catalyst 9800 Embedded Wireless Controller
Cisco Catalyst 9800 Series Wireless Controllers
Embedded Wireless Controller on Catalyst Access Points
Catalyst 9800 Wireless Controllers for Cloud
Cisco IOS XE

How to mitigate CVE-2021-1611

Install updates from vendor's website.

Cisco IOS XE - update to 17.5.1

External References

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

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