# CVE-2021-20790: Code injection in RevoWorks Browser

> Attackers can execute arbitrary code in RevoWorks Browser via unspecified vectors, requiring users to upgrade to a patched version.

- **Severity:** Critical 9.6 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H`)
- **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:** 17 Sep 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-f6q4-rmxf-9wwm

## What is CVE-2021-20790?

CVE-2021-20790 is a critical code injection vulnerability in J’s Communication Co., Ltd. RevoWorks Browser, published on 17 Sep 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

Improper control of program execution vulnerability in RevoWorks Browser 2.1.230 and earlier allows an attacker to execute an arbitrary command or code via unspecified vectors.

## Which versions are affected by CVE-2021-20790?

It affects 1 product.


Products: Jscom Revoworks Browser.

## How do I fix CVE-2021-20790?

No fix has been published for CVE-2021-20790 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-20790 being exploited?

There is no known exploitation of CVE-2021-20790 in the wild and no public exploit code.

## Other vulnerabilities in J’s Communication Co., Ltd. RevoWorks Browser

- [CVE-2021-20791](https://insights.sbomify.com/CVE-2021-20791/): Missing authorization in RevoWorks Browser (critical 9.3)
- [CVE-2022-27176](https://insights.sbomify.com/CVE-2022-27176/): Code injection in RevoWorks SCVX, RevoWorks Browser, and RevoWorks (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-20790 and fix it if it is affected.

What it is: CVE-2021-20790 is a critical code injection vulnerability in J’s Communication Co., Ltd. RevoWorks Browser, published on 17 Sep 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-2021-20790 in the wild and no public exploit code.

Affected product: J’s Communication Co., Ltd. RevoWorks Browser. 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-2021-20790/ (Markdown: https://insights.sbomify.com/CVE-2021-20790/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-20790
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-20790
- OSV: https://osv.dev/vulnerability/CVE-2021-20790

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-20790/
Summaries are generated and may contain mistakes; the official description above is the record.