# CVE-2023-33778: Hardcoded credentials in n/a

> Attackers can bind Draytek devices to their accounts using hardcoded keys, enabling unauthorized license creation and synchronization.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/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:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 1 Jun 2023
- **Updated:** 9 Jan 2025
- **Also known as:** GHSA-68ff-q375-8phx

## What is CVE-2023-33778?

CVE-2023-33778 is a critical vulnerability in Draytek Vigor3910 Firmware, published on 1 Jun 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Draytek Vigor Routers firmware versions below 3.9.6/4.2.4, Access Points firmware versions below v1.4.0, Switches firmware versions below 2.6.7, and Myvigor firmware versions below 2.3.2 were discovered to use hardcoded encryption keys which allows attackers to bind any affected device to their own account. Attackers are then able to create WCF and DrayDDNS licenses and synchronize them from the website.

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

## Which versions are affected by CVE-2023-33778?

It affects 72 products.


Products: Draytek Myvigor, Draytek Vigor1000b Firmware, Draytek Vigor130 Firmware, Draytek Vigor165 Firmware, Draytek Vigor166 Firmware, Draytek Vigor167 Firmware, Draytek Vigor2135ac Firmware, Draytek Vigor2135ax Firmware, Draytek Vigor2135fvac Firmware, Draytek Vigor2135vac Firmware, Draytek Vigor2620l Firmware, Draytek Vigor2620ln Firmware, Draytek Vigor2763ac Firmware, Draytek Vigor2765ac Firmware, Draytek Vigor2765ax Firmware, Draytek Vigor2765vac Firmware, Draytek Vigor2766ac Firmware, Draytek Vigor2766ax Firmware, Draytek Vigor2766vac Firmware, Draytek Vigor2832n Firmware and 52 more.

## How do I fix CVE-2023-33778?

No fix has been published for CVE-2023-33778 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-33778 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-33778 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-33778 and fix it if it is affected.

What it is: CVE-2023-33778 is a critical vulnerability in Draytek Vigor3910 Firmware, published on 1 Jun 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-33778 exists.

Affected product: Draytek Vigor3910 Firmware. 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-2023-33778/ (Markdown: https://insights.sbomify.com/CVE-2023-33778/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-33778
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-33778
- OSV: https://osv.dev/vulnerability/CVE-2023-33778

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From sbomify Insights: https://insights.sbomify.com/CVE-2023-33778/
Summaries are generated and may contain mistakes; the official description above is the record.