{"id":"CVE-2020-3363","url":"https://www.cyber-defence.io/tools/cve/CVE-2020-3363","generatedAt":"2026-10-27T22:23:57.734Z","title":"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.","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.","published":"2020-08-17T18:15:13.000Z","lastModified":"2026-06-17T03:18:05.000Z","status":"Modified","sourceIdentifier":"psirt@cisco.com","cvss":{"version":"3.1","score":8.6,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H"},"cwe":["CWE-20"],"affected":["cisco/sg250x-24 firmware","cisco/sg250x-24p firmware","cisco/sg250x-48 firmware","cisco/sg250x-48p firmware","cisco/sg250-08 firmware","cisco/sg250-08hp firmware","cisco/sg250-10p firmware","cisco/sg250-18 firmware","cisco/sg250-26 firmware","cisco/sg250-26hp firmware","cisco/sg250-26p firmware","cisco/sg250-50 firmware","cisco/sg250-50hp firmware","cisco/sg250-50p firmware","cisco/sf250-24 firmware","cisco/sf250-24p firmware","cisco/sf250-48 firmware","cisco/sf250-48hp firmware","cisco/sg350-10 firmware","cisco/sg350-10p firmware","cisco/sg350-10mp firmware","cisco/sg355-10p firmware","cisco/sg350-28 firmware","cisco/sg350-28p firmware","cisco/sg350-28mp firmware","cisco/sf350-48 firmware","cisco/sf350-48p firmware","cisco/sf350-48mp firmware","cisco/sg350xg-2f10 firmware","cisco/sg350xg-24f firmware","cisco/sg350xg-24t firmware","cisco/sg350xg-48t firmware","cisco/sg350x-24 firmware","cisco/sg350x-24p firmware","cisco/sg350x-24mp firmware","cisco/sg350x-48 firmware","cisco/sg350x-48p firmware","cisco/sg350x-48mp firmware","cisco/sx550x-16ft firmware","cisco/sx550x-24ft firmware","cisco/sx550x-12f firmware","cisco/sx550x-24f firmware","cisco/sx550x-24 firmware","cisco/sx550x-52 firmware","cisco/sg550x-24 firmware","cisco/sg550x-24p firmware","cisco/sg550x-24mp firmware","cisco/sg550x-24mpp firmware","cisco/sg550x-48 firmware","cisco/sg550x-48p firmware","cisco/sg550x-48mp firmware","cisco/sf550x-24 firmware","cisco/sf550x-24p firmware","cisco/sf550x-24mp firmware","cisco/sf550x-48 firmware","cisco/sf550x-48p firmware","cisco/sf550x-48mp firmware","cisco/sg200-50 firmware","cisco/sg200-50p firmware","cisco/sg200-50fp firmware"],"epss":{"score":0.01819,"percentile":0.78578,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (1.82%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sbss-ipv6-dos-3bLk6vA","tags":["Vendor Advisory"],"source":"psirt@cisco.com"},{"url":"https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sbss-ipv6-dos-3bLk6vA","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2020-3363","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}