# CVE-2020-9435: Hardcoded credentials in n/a

> Attackers can perform man-in-the-middle or decryption attacks on PHOENIX CONTACT routers due to a default hardcoded certificate used for web services.

- **Severity:** High 7.5 (`CVSS:3.1/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:** 12 Mar 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-7r3j-fq4p-vrxx

## What is CVE-2020-9435?

CVE-2020-9435 is a high-severity vulnerability in n/a, published on 12 Mar 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

PHOENIX CONTACT TC ROUTER 3002T-4G through 2.05.3, TC ROUTER 2002T-3G through 2.05.3, TC ROUTER 3002T-4G VZW through 2.05.3, TC ROUTER 3002T-4G ATT through 2.05.3, TC CLOUD CLIENT 1002-4G through 2.03.17, and TC CLOUD CLIENT 1002-TXTX through 1.03.17 devices contain a hardcoded certificate (and key) that is used by default for web-based services on the device. Impersonation, man-in-the-middle, or passive decryption attacks are possible if the generic certificate is not replaced by a device-specific certificate during installation.

Weakness: CWE-798 (Use of Hard-coded Credentials)

## Which versions are affected by CVE-2020-9435?

It affects 6 products.


Products: Phoenixcontact Tc Cloud Client 1002-4g Firmware, Phoenixcontact Tc Cloud Client 1002-Txtx Firmware, Phoenixcontact Tc Router 2002t-3g Firmware, Phoenixcontact Tc Router 3002t-4g Att Firmware, Phoenixcontact Tc Router 3002t-4g Firmware, Phoenixcontact Tc Router 3002t-4g Vzw Firmware.

## How do I fix CVE-2020-9435?

No fix has been published for CVE-2020-9435 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-9435 being exploited?

There is no known exploitation of CVE-2020-9435 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2020-9436](https://insights.sbomify.com/CVE-2020-9436/): Command injection in n/a (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-9435 and fix it if it is affected.

What it is: CVE-2020-9435 is a high-severity vulnerability in n/a, published on 12 Mar 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-2020-9435 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-2020-9435/ (Markdown: https://insights.sbomify.com/CVE-2020-9435/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-9435
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-9435
- OSV: https://osv.dev/vulnerability/CVE-2020-9435

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-9435/
Summaries are generated and may contain mistakes; the official description above is the record.