# CVE-2020-27859: Path traversal in ESMPRO Manager

> Remote attackers can disclose sensitive information via path traversal in NEC ESMPRO Manager without authentication.

- **Severity:** High 7.5 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 20 Jan 2021
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-w9gf-29cq-m7g8

## What is CVE-2020-27859?

CVE-2020-27859 is a high-severity path traversal vulnerability in NEC ESMPRO Manager, published on 20 Jan 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

This vulnerability allows remote attackers to disclose sensitive information on affected installations of NEC ESMPRO Manager 6.42. Authentication is not required to exploit this vulnerability. The specific flaw exists within the GetEuaLogDownloadAction class. The issue results from the lack of proper validation of a user-supplied path prior to using it in file operations. An attacker can leverage this vulnerability to disclose information in the context of SYSTEM. Was ZDI-CAN-9607.

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

## Which versions are affected by CVE-2020-27859?

It affects 1 product.


Products: Nec Esmpro Manager.

## How do I fix CVE-2020-27859?

No fix has been published for CVE-2020-27859 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-27859 being exploited?

There is no known exploitation of CVE-2020-27859 in the wild and no public exploit code.

## Other vulnerabilities in NEC ESMPRO Manager

- [CVE-2020-10917](https://insights.sbomify.com/CVE-2020-10917/): Deserialization in ESMPRO Manager (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-27859 and fix it if it is affected.

What it is: CVE-2020-27859 is a high-severity path traversal vulnerability in NEC ESMPRO Manager, published on 20 Jan 2021. 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-2020-27859 in the wild and no public exploit code.

Affected product: NEC ESMPRO Manager. 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-2020-27859/ (Markdown: https://insights.sbomify.com/CVE-2020-27859/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-27859
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-27859
- OSV: https://osv.dev/vulnerability/CVE-2020-27859

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-27859/
Summaries are generated and may contain mistakes; the official description above is the record.