Resource exhaustion in Cisco Systems, Inc products - CVE-2021-1356
Published: March 25, 2021
Vulnerability identifier: #VU51726
CSH Severity: Low
CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-1356
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to perform a denial of service (DoS) attack.
The vulnerability exists due to application does not properly control consumption of internal resources within the web UI of Cisco IOS XE Software. A remote authenticated user can send specially crafted HTTP requests to the web UI and cause the web management software to hang and consume all available vty lines, preventing new session establishment.
Affected software
Cisco Wireless LAN Controller
Cisco Catalyst 9800 Series Wireless Controllers
Allen-Bradley Stratix 5400 Industrial Ethernet Switches
Allen-Bradley Stratix 5410 Industrial Distribution Switches
Allen-Bradley Stratix 5700 Industrial Managed Ethernet Switches
Allen-Bradley Stratix 8000 Modular Managed Ethernet Switches
Stratix 5800
Cisco IOS XE
Cisco Catalyst 9800 Series Wireless Controllers
Allen-Bradley Stratix 5400 Industrial Ethernet Switches
Allen-Bradley Stratix 5410 Industrial Distribution Switches
Allen-Bradley Stratix 5700 Industrial Managed Ethernet Switches
Allen-Bradley Stratix 8000 Modular Managed Ethernet Switches
Stratix 5800
Cisco IOS XE
How to mitigate CVE-2021-1356
Install updates from vendor's website.
Stratix 5800 - update to 17.04.01