Input validation error in Cisco Systems, Inc products - CVE-2020-3496

Vulnerability identifier: #VU45896

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-2020-3496

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 when processing IPv6 packets. A remote attacker can pass specially crafted IPv6 traffic to the device and perform a denial of service (DoS) attack.

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

Install updates from vendor's website.

• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sbss-ipv6-dos-tsgqbffW
• https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvt45826

• Denial of service in Cisco Small Business Smart and Managed Switches