#VU51725 Resource exhaustion in Cisco Systems, Inc products - CVE-2021-1220
Published: March 25, 2021
Vulnerability identifier: #VU51725
Vulnerability risk: Low
CVSSv4.0: 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/E:U/U:Clear
CVE-ID: CVE-2021-1220
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Cisco 2600 Series Multiservice Platforms
Cisco ASR 1000 Series Aggregation Services Routers
Cisco 1000 Series Integrated Services Routers
Cisco Catalyst 9300 Series Switches
Cisco Catalyst 9500 Series Switches
Cisco Catalyst 9200 Series Switches
Cisco IOS XE
Cisco 2600 Series Multiservice Platforms
Cisco ASR 1000 Series Aggregation Services Routers
Cisco 1000 Series Integrated Services Routers
Cisco Catalyst 9300 Series Switches
Cisco Catalyst 9500 Series Switches
Cisco Catalyst 9200 Series Switches
Cisco IOS XE
Software vendor:
Cisco Systems, Inc
Cisco Systems, Inc
Description
The vulnerability allows a remote user to perform a denial of service (DoS) attack.
The vulnerability exists due to insufficient validation of user-supplied input within the web UI of Cisco IOS XE Software. A remote authenticated user can send specially crafted HTTP request to the web UI and cause the web management software to hang and consume all available vty lines, preventing new session establishment.
Remediation
Install updates from vendor's website.