# CVE-2019-1943: Cisco Small Business Series Switches Open Redirect Vulnerability

> An unauthenticated remote attacker can redirect users to malicious sites via the web interface, facilitating phishing attacks on Cisco Small Business Switches.

- **Severity:** Medium 4.7 (`CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 17 Jul 2019
- **Updated:** 21 Nov 2024
- **Also known as:** GHSA-c4p7-9fgh-g95m

## What is CVE-2019-1943?

CVE-2019-1943 is a medium-severity vulnerability in Cisco Small Business 300 Series Managed Switches, published on 17 Jul 2019. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

A vulnerability in the web interface of Cisco Small Business 200, 300, and 500 Series Switches software could allow an unauthenticated, remote attacker to redirect a user to a malicious web page. The vulnerability is due to improper input validation of the parameters of an HTTP request. An attacker could exploit this vulnerability by intercepting a user's HTTP request and modifying it into a request that causes the web interface to redirect the user to a specific malicious URL. This type of vulnerability is known as an open redirect attack and is used in phishing attacks that get users to unknowingly visit malicious sites.

Weakness: CWE-601 (URL Redirection to Untrusted Site)

## Which versions are affected by CVE-2019-1943?

It affects 57 products.


Products: Cisco Sf200-24 Firmware, Cisco Sf200-24fp 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 Sf500-24p Firmware and 37 more.

## How do I fix CVE-2019-1943?

No fix has been published for CVE-2019-1943 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-1943 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2019-1943 exists.

Public exploit code:

- CISCO Small Business 200 / 300 / 500 Switches - Multiple Vulnerabilities (exploitdb)
- Cisco Small Business 200,300 and 500 Series Switches - Open Redirect (nuclei): http/cves/2019/CVE-2019-1943.yaml

## Other vulnerabilities in Cisco Small Business 300 Series Managed Switches

- [CVE-2018-15439](https://insights.sbomify.com/CVE-2018-15439/): Cisco Small Business Switches Privileged Access Vulnerability (critical 9.8)
- [CVE-2020-3363](https://insights.sbomify.com/CVE-2020-3363/): Cisco Small Business Smart and Managed Switches Denial of Service Vulnerability (high 8.6)
- [CVE-2020-3297](https://insights.sbomify.com/CVE-2020-3297/): Cisco Small Business Smart and Managed Switches Session Management Vulnerability (high 8.1)
- [CVE-2019-12636](https://insights.sbomify.com/CVE-2019-12636/): Cisco Small Business Smart and Managed Switches Cross-Site Request Forgery Vulnerability (high 8.1)
- [CVE-2019-15993](https://insights.sbomify.com/CVE-2019-15993/): Cisco Small Business Switches Information Disclosure Vulnerability (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-1943 and fix it if it is affected.

What it is: CVE-2019-1943 is a medium-severity vulnerability in Cisco Small Business 300 Series Managed Switches, published on 17 Jul 2019. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2019-1943 exists.

Affected product: Cisco Small Business 300 Series Managed Switches. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2019-1943/ (Markdown: https://insights.sbomify.com/CVE-2019-1943/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-1943
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-1943
- OSV: https://osv.dev/vulnerability/CVE-2019-1943

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From sbomify Insights: https://insights.sbomify.com/CVE-2019-1943/
Summaries are generated and may contain mistakes; the official description above is the record.