# CVE-2021-34742: Cisco Vision Dynamic Signage Director Reflected Cross-Site Scripting Vulnerability

> Unauthenticated attackers can execute arbitrary scripts or access sensitive data by tricking users into clicking crafted links in the Cisco Vision Dynamic Signage Director interface.

- **Severity:** Medium 6.1 (`CVSS:3.1/AV:N/AC:L/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:** 6 Oct 2021
- **Updated:** 7 Nov 2024
- **Also known as:** GHSA-m49x-9cgf-q686

## What is CVE-2021-34742?

CVE-2021-34742 is a medium-severity cross-site scripting vulnerability in Cisco Vision Dynamic Signage Director, published on 6 Oct 2021. 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-based management interface of Cisco Vision Dynamic Signage Director could allow an unauthenticated, remote attacker to conduct a cross-site scripting (XSS) attack against a user of the interface on an affected device. This vulnerability is due to insufficient validation of user-supplied input by the web-based management interface. An attacker could exploit this vulnerability by persuading a user of the interface to click a crafted link. A successful exploit could allow the attacker to execute arbitrary script code in the context of the interface or access sensitive, browser-based information.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2021-34742?

It affects 1 product.


Products: Cisco Vision Dynamic Signage Director.

## How do I fix CVE-2021-34742?

No fix has been published for CVE-2021-34742 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-34742 being exploited?

There is no known exploitation of CVE-2021-34742 in the wild and no public exploit code.

## Other vulnerabilities in Cisco Vision Dynamic Signage Director

- [CVE-2019-1917](https://insights.sbomify.com/CVE-2019-1917/): Cisco Vision Dynamic Signage Director REST API Authentication Bypass Vulnerability (critical 9.1)
- [CVE-2020-3598](https://insights.sbomify.com/CVE-2020-3598/): Cisco Vision Dynamic Signage Director Missing Authentication Vulnerability (medium 6.5)
- [CVE-2019-16004](https://insights.sbomify.com/CVE-2019-16004/): Cisco Vision Dynamic Signage Director Authentication Bypass Vulnerability (medium 6.5)
- [CVE-2020-3485](https://insights.sbomify.com/CVE-2020-3485/): Cisco Vision Dynamic Signage Director Role-Based Access Control Vulnerability (medium 6.3)
- [CVE-2020-3491](https://insights.sbomify.com/CVE-2020-3491/): Cisco Vision Dynamic Signage Director Stored Cross-Site Scripting Vulnerability (medium 5.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-34742 and fix it if it is affected.

What it is: CVE-2021-34742 is a medium-severity cross-site scripting vulnerability in Cisco Vision Dynamic Signage Director, published on 6 Oct 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2021-34742 in the wild and no public exploit code.

Affected product: Cisco Vision Dynamic Signage Director. 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-2021-34742/ (Markdown: https://insights.sbomify.com/CVE-2021-34742/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-34742
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-34742
- OSV: https://osv.dev/vulnerability/CVE-2021-34742

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-34742/
Summaries are generated and may contain mistakes; the official description above is the record.