What’s Vulnerable › Vulnerabilities
CVE-2020-3363: Cisco Small Business Smart and Managed Switches Denial of Service Vulnerability
- Severity: high (CVSS 8.6 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 1.8% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2020-08-17 · updated 2026-06-17
- Weakness: CWE-20
Description
A vulnerability in the IPv6 packet processing engine of Cisco Small Business Smart and Managed Switches could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to insufficient validation of incoming IPv6 traffic. An attacker could exploit this vulnerability by sending a crafted IPv6 packet through an affected device. A successful exploit could allow the attacker to cause an unexpected reboot of the switch, leading to a DoS condition. This vulnerability is specific to IPv6 traffic. IPv4 traffic is not affected.
Affected products
- Cisco Sf200-24 Firmware: all versions
- Cisco Sf200-24Fp Firmware: all versions
- Cisco Sf200-24P Firmware: all versions
- Cisco Sf200-48 Firmware: all versions
- Cisco Sf200-48P Firmware: all versions
- Cisco Sf250-24 Firmware: all versions
- Cisco Sf250-24P Firmware: all versions
- Cisco Sf250-48 Firmware: all versions
- Cisco Sf250-48Hp Firmware: all versions
- Cisco Sf300-08 Firmware: all versions
- Cisco Sf300-24 Firmware: all versions
- Cisco Sf300-24Mp Firmware: all versions
- Cisco Sf300-24P Firmware: all versions
- Cisco Sf300-24Pp Firmware: all versions
- Cisco Sf300-48 Firmware: all versions
- Cisco Sf300-48P Firmware: all versions
- Cisco Sf300-48Pp Firmware: all versions
- Cisco Sf302-08 Firmware: all versions
- Cisco Sf302-08Mp Firmware: all versions
- Cisco Sf302-08Mpp Firmware: all versions
- Cisco Sf302-08P Firmware: all versions
- Cisco Sf302-08Pp Firmware: all versions
- Cisco Sf350-48 Firmware: all versions
- Cisco Sf350-48Mp Firmware: all versions
- Cisco Sf350-48P Firmware: all versions
- Cisco Sf500-24 Firmware: all versions
- Cisco Sf500-24P Firmware: all versions
- Cisco Sf500-48 Firmware: all versions
- Cisco Sf500-48P Firmware: all versions
- Cisco Sf550X-24 Firmware: all versions
References
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sbss-ipv6-dos-3bLk6vA
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sbss-ipv6-dos-3bLk6vA
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