# CVE-2020-8863: Auth bypass in Multiple Routers

> Network-adjacent attackers can bypass authentication on D-Link routers to escalate privileges and execute arbitrary code.

- **Severity:** High 8.8 (`CVSS:3.0/AV:A/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:** 23 Mar 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-6hjg-qfm2-9xc2

## What is CVE-2020-8863?

CVE-2020-8863 is a high-severity authentication bypass vulnerability in D-Link Multiple Routers, published on 23 Mar 2020. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

This vulnerability allows network-adjacent attackers to bypass authentication on affected installations of D-Link DIR-867, DIR-878, and DIR-882 routers with firmware 1.10B04. Authentication is not required to exploit this vulnerability. The specific flaw exists within the handling of HNAP login requests. The issue results from the lack of proper implementation of the authentication algorithm. An attacker can leverage this vulnerability to escalate privileges and execute code in the context of the router. Was ZDI-CAN-9470.

Weakness: CWE-287 (Improper Authentication), CWE-303 (Incorrect Implementation of Authentication Algorithm)

## Which versions are affected by CVE-2020-8863?

It affects 3 products.


Products: Dlink Dir-867 Firmware, Dlink Dir-878 Firmware, Dlink Dir-882 Firmware.

## How do I fix CVE-2020-8863?

No fix has been published for CVE-2020-8863 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-8863 being exploited?

There is no known exploitation of CVE-2020-8863 in the wild and no public exploit code.

## Other vulnerabilities in D-Link Multiple Routers

- [CVE-2023-24762](https://insights.sbomify.com/CVE-2023-24762/): Command injection in n/a (critical 9.8)
- [CVE-2022-41140](https://insights.sbomify.com/CVE-2022-41140/): Memory corruption in Multiple Routers (high 8.8)
- [CVE-2020-8864](https://insights.sbomify.com/CVE-2020-8864/): Auth bypass in Multiple Routers (high 8.8)
- [CVE-2025-6334](https://insights.sbomify.com/CVE-2025-6334/): D-Link DIR-867 Query String strncpy stack-based overflow (high 8.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-8863 and fix it if it is affected.

What it is: CVE-2020-8863 is a high-severity authentication bypass vulnerability in D-Link Multiple Routers, published on 23 Mar 2020. 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-2020-8863 in the wild and no public exploit code.

Affected product: D-Link Multiple Routers. 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-2020-8863/ (Markdown: https://insights.sbomify.com/CVE-2020-8863/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-8863
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-8863
- OSV: https://osv.dev/vulnerability/CVE-2020-8863

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-8863/
Summaries are generated and may contain mistakes; the official description above is the record.