Vulnerability identifier: #VU34093

Vulnerability risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-3363

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Cisco 250 Series Smart Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco 350 Series Managed Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco 350X Series Stackable Managed Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco 550X Series Stackable Managed Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Small Business 200 Series Smart Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Small Business 300 Series Managed Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Small Business 500 Series Stackable Managed Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc

Vendor: Cisco Systems, Inc

Description

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.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Cisco 250 Series Smart Switches: All versions

Cisco 350 Series Managed Switches: All versions

Cisco 350X Series Stackable Managed Switches: All versions

Cisco 550X Series Stackable Managed Switches: All versions

Cisco Small Business 200 Series Smart Switches: All versions

Cisco Small Business 300 Series Managed Switches: All versions

Cisco Small Business 500 Series Stackable Managed Switches: All versions

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External links
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sbss-ipv6-dos-3bLk6vA

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.