# CVE-2021-20695: Security feature bypass in DAP-1880AC

> Remote authenticated attackers can gain root privileges on D-Link DAP-1880AC devices due to improper certificate chain validation.

- **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 26 Apr 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-j8p3-7fhr-ghv2

## What is CVE-2021-20695?

CVE-2021-20695 is a high-severity vulnerability in D-Link Japan K.K. DAP-1880AC, published on 26 Apr 2021. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Improper following of a certificate's chain of trust vulnerability in DAP-1880AC firmware version 1.21 and earlier allows a remote authenticated attacker to gain root privileges via unspecified vectors.

Weakness: CWE-295 (Improper Certificate Validation)

## Which versions are affected by CVE-2021-20695?

It affects 1 product.


Products: Dlink Dap-1880ac Firmware.

## How do I fix CVE-2021-20695?

No fix has been published for CVE-2021-20695 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-20695 being exploited?

There is no known exploitation of CVE-2021-20695 in the wild and no public exploit code.

## Other vulnerabilities in D-Link Japan K.K. DAP-1880AC

- [CVE-2021-20697](https://insights.sbomify.com/CVE-2021-20697/): Missing authorization in DAP-1880AC (critical 9.8)
- [CVE-2021-20694](https://insights.sbomify.com/CVE-2021-20694/): Auth bypass in DAP-1880AC (high 8.8)
- [CVE-2021-20696](https://insights.sbomify.com/CVE-2021-20696/): Command injection in DAP-1880AC (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-20695 and fix it if it is affected.

What it is: CVE-2021-20695 is a high-severity vulnerability in D-Link Japan K.K. DAP-1880AC, published on 26 Apr 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-20695 in the wild and no public exploit code.

Affected product: D-Link Japan K.K. DAP-1880AC. 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-2021-20695/ (Markdown: https://insights.sbomify.com/CVE-2021-20695/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-20695
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-20695
- OSV: https://osv.dev/vulnerability/CVE-2021-20695

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-20695/
Summaries are generated and may contain mistakes; the official description above is the record.