{"cve":"CVE-2020-3496","nvd":{"published":"2020-08-26T17:15:14.210","modified":"2026-06-17T03:18:25.800","status":"Modified","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 the switch management CLI to stop responding, resulting in a DoS condition. This vulnerability is specific to IPv6 traffic. IPv4 traffic is not affected.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","score":5.3},"cwes":["CWE-20"],"references":["https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sbss-ipv6-dos-tsgqbffW","https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sbss-ipv6-dos-tsgqbffW"],"products":["cisco:sf200-24_firmware","cisco:sf200-24fp_firmware","cisco:sf200-24p_firmware","cisco:sf200-48_firmware","cisco:sf200-48p_firmware","cisco:sf250-24_firmware","cisco:sf250-24p_firmware","cisco:sf250-48_firmware","cisco:sf250-48hp_firmware","cisco:sf300-08_firmware","cisco:sf300-24_firmware","cisco:sf300-24mp_firmware","cisco:sf300-24p_firmware","cisco:sf300-24pp_firmware","cisco:sf300-48_firmware","cisco:sf300-48p_firmware","cisco:sf300-48pp_firmware","cisco:sf302-08_firmware","cisco:sf302-08mp_firmware","cisco:sf302-08mpp_firmware","cisco:sf302-08p_firmware","cisco:sf302-08pp_firmware","cisco:sf350-48_firmware","cisco:sf350-48mp_firmware","cisco:sf350-48p_firmware","cisco:sf500-24_firmware","cisco:sf500-24p_firmware","cisco:sf500-48_firmware","cisco:sf500-48p_firmware","cisco:sf550x-24_firmware","cisco:sf550x-24mp_firmware","cisco:sf550x-24p_firmware","cisco:sf550x-48_firmware","cisco:sf550x-48mp_firmware","cisco:sf550x-48p_firmware","cisco:sg200-08_firmware","cisco:sg200-08p_firmware","cisco:sg200-10fp_firmware","cisco:sg200-18_firmware","cisco:sg200-26_firmware","cisco:sg200-26fp_firmware","cisco:sg200-26p_firmware","cisco:sg200-50_firmware","cisco:sg200-50fp_firmware","cisco:sg200-50p_firmware","cisco:sg250-08_firmware","cisco:sg250-08hp_firmware","cisco:sg250-10p_firmware","cisco:sg250-18_firmware","cisco:sg250-26_firmware"],"source":"nvd","synced_at":"2026-10-19T21:09:20.498348299+00:00"},"epss":{"cve":"CVE-2020-3496","score":0.01737,"percentile":0.77699,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}