{"cve":"CVE-2019-1891","nvd":{"published":"2019-07-06T02:15:11.183","modified":"2026-06-17T02:29:32.640","status":"Modified","description":"A vulnerability in the web interface of Cisco Small Business 200, 300, and 500 Series 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 improper validation of requests sent to the web interface. An attacker could exploit this vulnerability by sending a malicious request to the web interface of an affected device. A successful exploit could allow the attacker to cause an unexpected reload of the device, resulting in a DoS condition.","cvss_v4":null,"cvss_v3":{"version":"3.0","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-20"],"references":["https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190703-sbss-dos","https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190703-sbss-dos"],"products":["cisco:esw2-350g52dc_firmware","cisco:esw2-550x48dc_firmware","cisco:sf200-24_firmware","cisco:sf200-24p_firmware","cisco:sf200-48_firmware","cisco:sf200-48p_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:sf500-24_firmware","cisco:sf500-24mp_firmware","cisco:sf500-24p_firmware","cisco:sf500-48_firmware","cisco:sf500-48mp_firmware","cisco:sf500-48p_firmware","cisco:sg200-18_firmware","cisco:sg200-26_firmware","cisco:sg200-26p_firmware","cisco:sg200-50_firmware","cisco:sg200-50p_firmware","cisco:sg300-10_firmware","cisco:sg300-10mp_firmware","cisco:sg300-10mpp_firmware","cisco:sg300-10p_firmware","cisco:sg300-10pp_firmware","cisco:sg300-10sfp_firmware","cisco:sg300-20_firmware","cisco:sg300-28_firmware","cisco:sg300-28mp_firmware","cisco:sg300-28p_firmware","cisco:sg300-28pp_firmware","cisco:sg300-28sfp_firmware","cisco:sg300-52_firmware","cisco:sg300-52mp_firmware","cisco:sg300-52p_firmware","cisco:sg500-28_firmware","cisco:sg500-28mpp_firmware","cisco:sg500-28p_firmware","cisco:sg500-52_firmware","cisco:sg500-52mp_firmware"],"source":"nvd","synced_at":"2026-10-19T20:57:00.690689396+00:00"},"epss":{"cve":"CVE-2019-1891","score":0.01772,"percentile":0.78155,"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."]}