# CVE-2020-7521: Path traversal in SFAPV9601 - APC Easy UPS On-Line Software V2.0 and earlier

> Attackers can upload executable files to arbitrary directories via path traversal in the FileUploadServlet, potentially leading to remote code execution.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 31 Aug 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-2v88-f22x-fw8j

## What is CVE-2020-7521?

CVE-2020-7521 is a critical path traversal vulnerability in SFAPV9601 - APC Easy UPS On-Line Software V2.0 and earlier, published on 31 Aug 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability exists in SFAPV9601 - APC Easy UPS On-Line Software (V2.0 and earlier) when accessing a vulnerable method of `FileUploadServlet` which may lead to uploading executable files to non-specified directories.

Weakness: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2020-7521?

It affects 1 product.


Products: Schneider-Electric Apc Easy Ups Online Software.

## How do I fix CVE-2020-7521?

No fix has been published for CVE-2020-7521 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-7521 being exploited?

There is no known exploitation of CVE-2020-7521 in the wild and no public exploit code.

## Other vulnerabilities in SFAPV9601 - APC Easy UPS On-Line Software V2.0 and earlier

- [CVE-2020-7522](https://insights.sbomify.com/CVE-2020-7522/): Path traversal in SFAPV9601 - APC Easy UPS On-Line Software V2.0 and earlier (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-7521 and fix it if it is affected.

What it is: CVE-2020-7521 is a critical path traversal vulnerability in SFAPV9601 - APC Easy UPS On-Line Software V2.0 and earlier, published on 31 Aug 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-7521 in the wild and no public exploit code.

Affected product: SFAPV9601 - APC Easy UPS On-Line Software V2.0 and earlier. 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-2020-7521/ (Markdown: https://insights.sbomify.com/CVE-2020-7521/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-7521
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-7521
- OSV: https://osv.dev/vulnerability/CVE-2020-7521

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-7521/
Summaries are generated and may contain mistakes; the official description above is the record.