# CVE-2021-35237: Clickjacking Vulnerability

> Attackers can trick users into clicking hidden elements via clickjacking due to missing X-Frame-Options headers in Kiwi Syslog Server.

- **Severity:** Medium 5.0 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L`)
- **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:** 29 Oct 2021
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-7wwf-jwf3-5r2m

## What is CVE-2021-35237?

CVE-2021-35237 is a medium-severity vulnerability in SolarWinds Kiwi Syslog Server, published on 29 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 missing HTTP header (X-Frame-Options) in Kiwi Syslog Server has left customers vulnerable to click jacking. Clickjacking is an attack that occurs when an attacker uses a transparent iframe in a window to trick a user into clicking on an actionable item, such as a button or link, to another server in which they have an identical webpage. The attacker essentially hijacks the user activity intended for the original server and sends them to the other server. This is an attack on both the user and the server.

Weakness: CWE-1021 (Improper Restriction of Rendered UI Layers or Frames)

## Which versions are affected by CVE-2021-35237?

It affects 1 product.


Products: Solarwinds Kiwi Syslog Server.

## How do I fix CVE-2021-35237?

No fix has been published for CVE-2021-35237 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-35237 being exploited?

There is no known exploitation of CVE-2021-35237 in the wild and no public exploit code.

## Other vulnerabilities in SolarWinds Kiwi Syslog Server

- [CVE-2021-35231](https://insights.sbomify.com/CVE-2021-35231/): Unquoted Path (SMB Login) Vulnerability (medium 6.7)
- [CVE-2021-35233](https://insights.sbomify.com/CVE-2021-35233/): HTTP TRACK & TRACE Methods Enabled (medium 5.3)
- [CVE-2021-35235](https://insights.sbomify.com/CVE-2021-35235/): ASP.NET Debug Feature Enabled (medium 5.3)
- [CVE-2021-35236](https://insights.sbomify.com/CVE-2021-35236/): Missing Secure Flag From SSL Cookie (low 3.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-35237 and fix it if it is affected.

What it is: CVE-2021-35237 is a medium-severity vulnerability in SolarWinds Kiwi Syslog Server, published on 29 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-2021-35237 in the wild and no public exploit code.

Affected product: SolarWinds Kiwi Syslog Server. 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-2021-35237/ (Markdown: https://insights.sbomify.com/CVE-2021-35237/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-35237
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-35237
- OSV: https://osv.dev/vulnerability/CVE-2021-35237

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-35237/
Summaries are generated and may contain mistakes; the official description above is the record.