# CVE-2020-7520: Open redirect in Schneider Electric Software Update (SESU) V2.4.0 and prior.

> An attacker with privileged access can modify registry keys to redirect update traffic, enabling a man-in-the-middle attack that leads to malicious code execution.

- **Severity:** Medium 4.7 (`CVSS:3.1/AV:N/AC:H/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:** 23 Jul 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-392j-2p2c-c7m3

## What is CVE-2020-7520?

CVE-2020-7520 is a medium-severity vulnerability in Schneider Electric Software Update (SESU) V2.4.0 and prior., published on 23 Jul 2020. 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 CWE-601: URL Redirection to Untrusted Site ('Open Redirect') vulnerability exists in Schneider Electric Software Update (SESU), V2.4.0 and prior, which could cause execution of malicious code on the victim's machine. In order to exploit this vulnerability, an attacker requires privileged access on the engineering workstation to modify a Windows registry key which would divert all traffic updates to go through a server in the attacker's possession. A man-in-the-middle attack is then used to complete the exploit.

Weakness: CWE-601 (URL Redirection to Untrusted Site)

## Which versions are affected by CVE-2020-7520?

It affects 1 product.


Products: Schneider-Electric Software Update Utility.

## How do I fix CVE-2020-7520?

No fix has been published for CVE-2020-7520 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-7520 being exploited?

There is no known exploitation of CVE-2020-7520 in the wild and no public exploit code.

## Other vulnerabilities in Schneider Electric Software Update (SESU) V2.4.0 and prior.

- [CVE-2013-0655](https://insights.sbomify.com/CVE-2013-0655/): Other in n/a (critical 9.3)
- [CVE-2018-7799](https://insights.sbomify.com/CVE-2018-7799/): Code injection in Schneider Electric Software Update (SESU), all versions prior to V2.2.0 (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-7520 and fix it if it is affected.

What it is: CVE-2020-7520 is a medium-severity vulnerability in Schneider Electric Software Update (SESU) V2.4.0 and prior., published on 23 Jul 2020. 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-2020-7520 in the wild and no public exploit code.

Affected product: Schneider Electric Software Update (SESU) V2.4.0 and prior.. 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-2020-7520/ (Markdown: https://insights.sbomify.com/CVE-2020-7520/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-7520
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-7520
- OSV: https://osv.dev/vulnerability/CVE-2020-7520

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From sbomify Insights: https://insights.sbomify.com/CVE-2020-7520/
Summaries are generated and may contain mistakes; the official description above is the record.