# CVE-2021-30121: (Semi-)Authenticated local file inclusion in Kaseya VSA < v9.5.6

> An attacker with a valid session can read arbitrary files from the server via local file inclusion in Kaseya VSA.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 9 Jul 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-v66q-p7rm-w9w6

## What is CVE-2021-30121?

CVE-2021-30121 is a medium-severity path traversal vulnerability in n/a, published on 9 Jul 2021. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Semi-authenticated local file inclusion The contents of arbitrary files can be returned by the webserver Example request: `https://x.x.x.x/KLC/js/Kaseya.SB.JS/js.aspx?path=C:\Kaseya\WebPages\dl.asp` A valid sessionId is required but can be easily obtained via CVE-2021-30118

Weakness: CWE-829 (Inclusion of Functionality from Untrusted Control Sphere)

## Which versions are affected by CVE-2021-30121?

It affects 1 product.


Products: Kaseya Vsa.

## How do I fix CVE-2021-30121?

No fix has been published for CVE-2021-30121 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-30121 being exploited?

There is no known exploitation of CVE-2021-30121 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2021-30120](https://insights.sbomify.com/CVE-2021-30120/): 2FA bypass in Kaseya VSA <= v9.5.6 (critical 9.9)
- [CVE-2021-30117](https://insights.sbomify.com/CVE-2021-30117/): Authenticated SQL injection in Kaseya VSA < v9.5.6 (critical 9.8)
- [CVE-2021-30118](https://insights.sbomify.com/CVE-2021-30118/): Unauthenticated Remote Code Execution in Kaseya VSA < v9.5.5 (critical 9.8)
- [CVE-2021-30201](https://insights.sbomify.com/CVE-2021-30201/): Unauthenticated XML External Entity vulnerability in Kaseya VSA < v9.5.6 (high 7.5)
- [CVE-2019-14510](https://insights.sbomify.com/CVE-2019-14510/): Hardcoded credentials in n/a (medium 6.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-30121 and fix it if it is affected.

What it is: CVE-2021-30121 is a medium-severity path traversal vulnerability in n/a, published on 9 Jul 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-30121 in the wild and no public exploit code.

Affected product: n/a. 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-2021-30121/ (Markdown: https://insights.sbomify.com/CVE-2021-30121/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-30121
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-30121
- OSV: https://osv.dev/vulnerability/CVE-2021-30121

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-30121/
Summaries are generated and may contain mistakes; the official description above is the record.