# CVE-2025-63353: Weak cryptography in n/a

> Attackers can predict default Wi-Fi passwords from SSIDs, allowing unauthorized network access to FiberHome GPON ONU devices.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/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:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 12 Nov 2025
- **Updated:** 13 Nov 2025
- **Also known as:** GHSA-cg2x-c25f-6327

## What is CVE-2025-63353?

CVE-2025-63353 is a critical vulnerability in n/a, published on 12 Nov 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability in FiberHome GPON ONU HG6145F1 RP4423 allows the device's factory default Wi-Fi password (WPA/WPA2 pre-shared key) to be predicted from the SSID. The device generates default passwords using a deterministic algorithm that derives the router passphrase from the SSID, enabling an attacker who can observe the SSID to predict the default password without authentication or user interaction.

Weakness: CWE-284 (Improper Access Control)

## Which versions are affected by CVE-2025-63353?

It affects 1 product.


Products: Fiberhome Hg6145f1 Firmware.

## How do I fix CVE-2025-63353?

No fix has been published for CVE-2025-63353 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-63353 being exploited?

There is no known exploitation of CVE-2025-63353 in the wild and no public exploit code.

Public exploit code:

- A vulnerability in fiberhome GPON ONU HG6145F1 RP4423 allows the  device's factory default Wi-Fi password (WPA/WPA2 pre-shared key) to be  predicted from the SSID (github_poc): https://github.com/hanianis/CVE-2025-63353
- CVE-2025-63353 (github_poc): https://github.com/r0otk3r/CVE-2025-63353
- This is a Proof-Of-Concept of CVE-2025-63353 (github_poc): https://github.com/0xA1M/CVE-2025-63353
- Multi-language PoC (Python · Go · JS · C) and technical documentation for CVE-2025-63353, a critical predictable-default-PSK vulnerability in FiberHome HG6145F1 GPON ONT devices.  (github_poc): https://github.com/zvckster/CVE-2025-63353
- Calculate a password from the six-character hexadecimal suffix of a FiberHome Wi-Fi SSID. CVE-2025-63353 (github_poc): https://github.com/code-fanatic/fiberhome-password-calculator

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-63353 and fix it if it is affected.

What it is: CVE-2025-63353 is a critical vulnerability in n/a, published on 12 Nov 2025. 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-2025-63353 in the wild and no public exploit code.

Affected product: n/a. 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-2025-63353/ (Markdown: https://insights.sbomify.com/CVE-2025-63353/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-63353
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-63353
- OSV: https://osv.dev/vulnerability/CVE-2025-63353

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-63353/
Summaries are generated and may contain mistakes; the official description above is the record.