# CVE-2021-31252: Open redirect in n/a

> An open redirect in CHIYU access control devices allows attackers to trick users into visiting malicious sites via crafted links.

- **Severity:** Medium 6.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 4 Jun 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-rgg4-cq58-9g4h

## What is CVE-2021-31252?

CVE-2021-31252 is a medium-severity vulnerability in n/a, published on 4 Jun 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

An open redirect vulnerability exists in BF-630, BF-450M, BF-430, BF-431, BF631-W, BF830-W, Webpass, and SEMAC devices from CHIYU Technology that can be exploited by sending a link that has a specially crafted URL to convince the user to click on it.

Weakness: CWE-601 (URL Redirection to Untrusted Site)

## Which versions are affected by CVE-2021-31252?

It affects 14 products.


Products: Chiyu-Tech Bf-430 Firmware, Chiyu-Tech Bf-431 Firmware, Chiyu-Tech Bf-450m Firmware, Chiyu-Tech Bf-630 Firmware, Chiyu-Tech Bf-631w Firmware, Chiyu-Tech Bf-830w Firmware, Chiyu-Tech Semac D1 Firmware, Chiyu-Tech Semac D2 Firmware, Chiyu-Tech Semac D2 N300 Firmware, Chiyu-Tech Semac D4 Firmware, Chiyu-Tech Semac S1 Osdp Firmware, Chiyu-Tech Semac S2 Firmware, Chiyu-Tech Semac S3v3 Firmware, Chiyu-Tech Webpass Firmware.

## How do I fix CVE-2021-31252?

No fix has been published for CVE-2021-31252 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-31252 being exploited?

There is no known exploitation of CVE-2021-31252 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2021-31251](https://insights.sbomify.com/CVE-2021-31251/): Auth bypass in n/a (critical 9.8)
- [CVE-2021-31249](https://insights.sbomify.com/CVE-2021-31249/): Other in n/a (medium 6.5)
- [CVE-2021-31641](https://insights.sbomify.com/CVE-2021-31641/): Cross-site scripting in n/a (medium 6.1)
- [CVE-2021-31250](https://insights.sbomify.com/CVE-2021-31250/): Cross-site scripting in n/a (medium 5.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-31252 and fix it if it is affected.

What it is: CVE-2021-31252 is a medium-severity vulnerability in n/a, published on 4 Jun 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2021-31252 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-2021-31252/ (Markdown: https://insights.sbomify.com/CVE-2021-31252/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-31252
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-31252
- OSV: https://osv.dev/vulnerability/CVE-2021-31252

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-31252/
Summaries are generated and may contain mistakes; the official description above is the record.