CVE-2019-1891

What it is

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.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of service disruption.

Exploit odds

1.8% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2019-07-06 02:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 02:29 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 1.8% in the next 30 days (EPSS).
• Severity: 7.5 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2019-07-06 02:15 UTC

Last modified

2026-06-17 02:29 UTC

Exploit probability

1.8% · EPSS, next 30 days

Weakness

CWE-20 · Improper input validation

Record status

Modified

Affected

• Cisco sf200-24 Firmware < 1.4.10.6
• Cisco sf200-24p Firmware < 1.4.10.6
• Cisco sf200-48 Firmware < 1.4.10.6
• Cisco sf200-48p Firmware < 1.4.10.6
• Cisco sg200-18 Firmware < 1.4.10.6
• Cisco sg200-26 Firmware < 1.4.10.6
• Cisco sg200-26p Firmware < 1.4.10.6
• Cisco sg200-50 Firmware < 1.4.10.6

Attack profile CVSS 3.0 · 7.5

Attack vector

Network

Complexity

Low

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2019-1891.md and follow it. Check whether this project is affected by CVE-2019-1891. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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