# CVE-2020-29321: Hardcoded credentials in D-Link Router DIR-868L

> An unauthenticated attacker can extract sensitive credentials from the firmware to gain unauthorized access to the router's telnet service.

- **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:** 4 Jun 2021
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-j5pc-jw5h-phhh

## What is CVE-2020-29321?

CVE-2020-29321 is a high-severity vulnerability in D-Link Router DIR-868L, published on 4 Jun 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The D-Link router DIR-868L 3.01 is vulnerable to credentials disclosure in telnet service through decompilation of firmware, that allows an unauthenticated attacker to gain access to the firmware and to extract sensitive data.

Weakness: CWE-798 (Use of Hard-coded Credentials), CWE-522 (Insufficiently Protected Credentials)

## Which versions are affected by CVE-2020-29321?

It affects 1 product.


Products: Dlink Dir-868l Firmware.

## How do I fix CVE-2020-29321?

No fix has been published for CVE-2020-29321 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-29321 being exploited?

There is no known exploitation of CVE-2020-29321 in the wild and no public exploit code.

## Other vulnerabilities in D-Link Router DIR-868L

- [CVE-2025-55583](https://insights.sbomify.com/CVE-2025-55583/): Command injection in n/a (critical 9.8)
- [CVE-2023-39665](https://insights.sbomify.com/CVE-2023-39665/): Memory corruption in n/a (critical 9.8)
- [CVE-2023-39667](https://insights.sbomify.com/CVE-2023-39667/): Memory corruption in n/a (critical 9.8)
- [CVE-2023-39668](https://insights.sbomify.com/CVE-2023-39668/): Memory corruption in n/a (critical 9.8)
- [CVE-2023-29856](https://insights.sbomify.com/CVE-2023-29856/): Memory corruption in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-29321 and fix it if it is affected.

What it is: CVE-2020-29321 is a high-severity vulnerability in D-Link Router DIR-868L, published on 4 Jun 2021. 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-2020-29321 in the wild and no public exploit code.

Affected product: D-Link Router DIR-868L. 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-2020-29321/ (Markdown: https://insights.sbomify.com/CVE-2020-29321/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-29321
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-29321
- OSV: https://osv.dev/vulnerability/CVE-2020-29321

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-29321/
Summaries are generated and may contain mistakes; the official description above is the record.