# CVE-2021-21955: Auth bypass in Anker

> An attacker can sniff network traffic to bypass authentication and recover passwords on Anker Eufy Homebase 2 devices.

- **Severity:** High 7.7 (`CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/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:** 9 Dec 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-f9ww-7rv4-vqfq

## What is CVE-2021-21955?

CVE-2021-21955 is a high-severity authentication bypass vulnerability in Anker, published on 9 Dec 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An authentication bypass vulnerability exists in the get_aes_key_info_by_packetid() function of the home_security binary of Anker Eufy Homebase 2 2.1.6.9h. Generic network sniffing can lead to password recovery. An attacker can sniff network traffic to trigger this vulnerability.

Weakness: CWE-287 (Improper Authentication), CWE-334 (Small Space of Random Values)

## Which versions are affected by CVE-2021-21955?

It affects 1 product.


Products: Anker Eufy Homebase 2 Firmware.

## How do I fix CVE-2021-21955?

No fix has been published for CVE-2021-21955 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-21955 being exploited?

There is no known exploitation of CVE-2021-21955 in the wild and no public exploit code.

## Other vulnerabilities in Anker

- [CVE-2022-21806](https://insights.sbomify.com/CVE-2022-21806/): Use after free in Eufy Homebase 2 (critical 10.0)
- [CVE-2021-21950](https://insights.sbomify.com/CVE-2021-21950/): Memory corruption in Anker (critical 10.0)
- [CVE-2021-21951](https://insights.sbomify.com/CVE-2021-21951/): Memory corruption in Anker (critical 10.0)
- [CVE-2021-21940](https://insights.sbomify.com/CVE-2021-21940/): Memory corruption in Anker (critical 10.0)
- [CVE-2021-21941](https://insights.sbomify.com/CVE-2021-21941/): Use after free in Anker (critical 10.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-21955 and fix it if it is affected.

What it is: CVE-2021-21955 is a high-severity authentication bypass vulnerability in Anker, published on 9 Dec 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-2021-21955 in the wild and no public exploit code.

Affected product: Anker. 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-2021-21955/ (Markdown: https://insights.sbomify.com/CVE-2021-21955/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-21955
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-21955
- OSV: https://osv.dev/vulnerability/CVE-2021-21955

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-21955/
Summaries are generated and may contain mistakes; the official description above is the record.