# CVE-2021-30066: Security feature bypass in n/a

> Attackers can bypass firmware signature verification to load arbitrary firmware on Schneider Electric and Belden Tofino firewalls, enabling code execution.

- **Severity:** Medium 6.8 (`CVSS:3.1/AV:P/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:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 3 Apr 2022
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-j2pq-xrmc-f4r4

## What is CVE-2021-30066?

CVE-2021-30066 is a medium-severity vulnerability in n/a, published on 3 Apr 2022. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

On Schneider Electric ConneXium Tofino Firewall TCSEFEA23F3F22 before 03.23, TCSEFEA23F3F20/21, and Belden Tofino Xenon Security Appliance, an arbitrary firmware image can be loaded because firmware signature verification (for a USB stick) can be bypassed. NOTE: this issue exists because of an incomplete fix of CVE-2017-11400.

Weakness: CWE-347 (Improper Verification of Cryptographic Signature)

## Which versions are affected by CVE-2021-30066?

It affects 13 products.


Products: Belden Eagle 20 Tofino 943 987-501-Tx\/Tx Firmware, Belden Eagle 20 Tofino 943 987-502 -Tx\/Mm Firmware, Belden Eagle 20 Tofino 943 987-504-Mm\/Tx Firmware, Belden Eagle 20 Tofino 943 987-505-Mm\/Mm Firmware, Belden Tofino Argon Fa-Tsa-100-Tx\/Tx Firmware, Belden Tofino Argon Fa-Tsa-220-Mm\/Mm Firmware, Belden Tofino Argon Fa-Tsa-220-Mm\/Tx Firmware, Belden Tofino Argon Fa-Tsa-220-Tx\/Mm Firmware, Belden Tofino Argon Fa-Tsa-220-Tx\/Tx Firmware, Belden Tofino Xenon Security Appliance Firmware, Schneider-Electric Tcsefea23f3f20 Firmware, Schneider-Electric Tcsefea23f3f21 Firmware, Schneider-Electric Tcsefea23f3f22 Firmware.

## How do I fix CVE-2021-30066?

No fix has been published for CVE-2021-30066 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-30066 being exploited?

There is no known exploitation of CVE-2021-30066 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2021-30064](https://insights.sbomify.com/CVE-2021-30064/): Hardcoded credentials in n/a (critical 9.8)
- [CVE-2021-30062](https://insights.sbomify.com/CVE-2021-30062/): Security feature bypass in n/a (high 7.5)
- [CVE-2021-30063](https://insights.sbomify.com/CVE-2021-30063/): Denial of service in n/a (high 7.5)
- [CVE-2021-30065](https://insights.sbomify.com/CVE-2021-30065/): Security feature bypass in n/a (high 7.5)
- [CVE-2021-30061](https://insights.sbomify.com/CVE-2021-30061/): Code injection in n/a (medium 6.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-30066 and fix it if it is affected.

What it is: CVE-2021-30066 is a medium-severity vulnerability in n/a, published on 3 Apr 2022. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-30066 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-2021-30066/ (Markdown: https://insights.sbomify.com/CVE-2021-30066/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-30066
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-30066
- OSV: https://osv.dev/vulnerability/CVE-2021-30066

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-30066/
Summaries are generated and may contain mistakes; the official description above is the record.