Input validation error in Cisco Systems, Inc products - CVE-2020-3363

Vulnerability identifier: #VU34093

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-2020-3363

CWE-ID: CWE-20

Exploitation vector: Remote access

Exploit availability: No public exploit available

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

The vulnerability exists due to insufficient validation of user-supplied input in the IPv6 packet processing engine. A remote attacker can send a specially crafted IPv6 packet and perform a denial of service (DoS) attack.

Cisco 250 Series Smart Switches
Cisco 350 Series Managed Switches
Cisco 350X Series Stackable Managed Switches
Cisco 550X Series Stackable Managed Switches
Cisco Small Business 200 Series Smart Switches
Cisco Small Business 300 Series Managed Switches
Cisco Small Business 500 Series Stackable Managed Switches

Install updates from vendor's website.

Cisco 250 Series Smart Switches - update to 2.5.5.47
Cisco 350 Series Managed Switches - update to 2.5.5.47
Cisco 350X Series Stackable Managed Switches - update to 2.5.5.47
Cisco 550X Series Stackable Managed Switches - update to 2.5.5.47

• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sbss-ipv6-dos-3bLk6vA

• Multiple vulnerabilities in Cisco Small Business Smart and Managed Switches