← Vulnerability feed

Vulnerability record · CVE-2019-1891 · published 6 July 2019

CVE-2019-1891: Cisco sf200-24 firmware improper input validation vulnerability

Cisco · Sf200 24 Firmware

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.

7.5 CVSS 3.0 High EPSS 1.8% · top 22.6% CWE-20 · Improper input validation
7.5CVSS 3.0 base score, v2 5.0
1.8%EPSS exploitation probability, 30 days
NoNot in CISA KEV
57Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

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:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

57 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190703-sbss-dos Vendor Advisory
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190703-sbss-dos Vendor Advisory

Track CVE-2019-1891 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2023-20189Cisco business 250-16p-2g firmware classic buffer overflow vulnerabilityMultiple vulnerabilities in the web-based user interface of certain Cisco Small Business Series Switches could allow an unauthenticated, remote attac…EPSS 11%9.8CVE-2023-20160Cisco business 250-16p-2g firmware classic buffer overflow vulnerabilityMultiple vulnerabilities in the web-based user interface of certain Cisco Small Business Series Switches could allow an unauthenticated, remote attac…EPSS 10%9.8CVE-2023-20158Cisco business 250-16p-2g firmware classic buffer overflow vulnerabilityMultiple vulnerabilities in the web-based user interface of certain Cisco Small Business Series Switches could allow an unauthenticated, remote attac…EPSS 1.2%9.8CVE-2023-20161Cisco business 250-16p-2g firmware classic buffer overflow vulnerabilityMultiple vulnerabilities in the web-based user interface of certain Cisco Small Business Series Switches could allow an unauthenticated, remote attac…EPSS 10%9.8CVE-2023-20159Cisco business 250-16p-2g firmware classic buffer overflow vulnerabilityMultiple vulnerabilities in the web-based user interface of certain Cisco Small Business Series Switches could allow an unauthenticated, remote attac…EPSS 10%9.8CVE-2023-20157Cisco business 250-16p-2g firmware classic buffer overflow vulnerabilityMultiple vulnerabilities in the web-based user interface of certain Cisco Small Business Series Switches could allow an unauthenticated, remote attac…EPSS 1.2%9.8CVE-2023-20162Cisco business 250-16p-2g firmware classic buffer overflow vulnerabilityMultiple vulnerabilities in the web-based user interface of certain Cisco Small Business Series Switches could allow an unauthenticated, remote attac…EPSS 1.2%9.8CVE-2023-20156Cisco business 250-16p-2g firmware classic buffer overflow vulnerabilityMultiple vulnerabilities in the web-based user interface of certain Cisco Small Business Series Switches could allow an unauthenticated, remote attac…EPSS 1.2%

Source: NIST National Vulnerability Database (record CVE-2019-1891), CISA KEV, FIRST EPSS (scores of 2026-10-05). This page is refreshed as NVD updates the record.