# CVE-2017-2721: Auth bypass in Berlin-L21,Berlin-L21HN,Berlin-L22,Berlin-L22HN,Berlin-L23,Berlin-L24HN,FRD-L02,FRD-L04,FRD-L09,FRD-L14,FRD-L19,

> Attackers can bypass Factory Reset Protection on Huawei smartphones via Swype Keyboard to update the Google account and gain unauthorized access.

- **Severity:** Medium 4.6 (`CVSS:3.0/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N`)
- **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:** 22 Nov 2017
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-26ch-2fxx-xjff

## What is CVE-2017-2721?

CVE-2017-2721 is a medium-severity authentication bypass vulnerability in Huawei Technologies Co., Ltd. Berlin-L21,Berlin-L21HN,Berlin-L22,Berlin-L22HN,Berlin-L23,Berlin-L24HN,FRD-L02,FRD-L04,FRD-L09,FRD-L14,FRD-L19,, published on 22 Nov 2017. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Some Huawei smart phones with software Berlin-L21C10B130,Berlin-L21C185B133,Berlin-L21HNC10B131,Berlin-L21HNC185B140,Berlin-L21HNC432B151,Berlin-L22C636B160,Berlin-L22HNC636B130,Berlin-L22HNC675B150CUSTC675D001,Berlin-L23C605B131,Berlin-L24HNC567B110,FRD-L02C432B120,FRD-L02C635B130,FRD-L02C675B170CUSTC675D001,FRD-L04C567B162,FRD-L04C605B131,FRD-L09C10B130,FRD-L09C185B130,FRD-L09C432B131,FRD-L09C636B130,FRD-L14C567B162,FRD-L19C10B130,FRD-L19C432B131,FRD-L19C636B130 have a factory Reset Protection (FRP) bypass security vulnerability. When re-configuring the mobile phone using the factory reset protection (FRP) function, an attacker can login the configuration flow by Swype Keyboard and can perform some operations to update the Google account. As a result, the FRP function is bypassed.

Weakness: CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2017-2721?

It affects 11 products.


Products: Huawei Berlin-L21 Firmware, Huawei Berlin-L21hn Firmware, Huawei Berlin-L22 Firmware, Huawei Berlin-L22hn Firmware, Huawei Berlin-L23 Firmware, Huawei Berlin-L24hn Firmware, Huawei Frd-L02 Firmware, Huawei Frd-L04 Firmware, Huawei Frd-L09 Firmware, Huawei Frd-L14 Firmware, Huawei Frd-L19 Firmware.

## How do I fix CVE-2017-2721?

No fix has been published for CVE-2017-2721 yet. Limit exposure of the affected software until one is available.

## Is CVE-2017-2721 being exploited?

There is no known exploitation of CVE-2017-2721 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2017-2721 and fix it if it is affected.

What it is: CVE-2017-2721 is a medium-severity authentication bypass vulnerability in Huawei Technologies Co., Ltd. Berlin-L21,Berlin-L21HN,Berlin-L22,Berlin-L22HN,Berlin-L23,Berlin-L24HN,FRD-L02,FRD-L04,FRD-L09,FRD-L14,FRD-L19,, published on 22 Nov 2017. 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-2017-2721 in the wild and no public exploit code.

Affected product: Huawei Technologies Co., Ltd. Berlin-L21,Berlin-L21HN,Berlin-L22,Berlin-L22HN,Berlin-L23,Berlin-L24HN,FRD-L02,FRD-L04,FRD-L09,FRD-L14,FRD-L19,. 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-2017-2721/ (Markdown: https://insights.sbomify.com/CVE-2017-2721/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2017-2721
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2017-2721
- OSV: https://osv.dev/vulnerability/CVE-2017-2721

---
From sbomify Insights: https://insights.sbomify.com/CVE-2017-2721/
Summaries are generated and may contain mistakes; the official description above is the record.