# CVE-2021-21921: SQL injection in Advantech

> An attacker can execute SQL commands via the name_filter parameter in Advantech web applications, potentially reading or modifying data.

- **Severity:** High 7.7 (`CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N`)
- **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:** 22 Dec 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-w987-mjq4-38r9

## What is CVE-2021-21921?

CVE-2021-21921 is a high-severity SQL injection vulnerability in Advantech, published on 22 Dec 2021. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A specially-crafted HTTP request can lead to SQL injection. An attacker can make authenticated HTTP requests to trigger this vulnerability at ‘name_filter’ parameter with the administrative account or through cross-site request forgery.

Weakness: CWE-89 (Improper Neutralization of Special Elements used in an SQL Command)

## Which versions are affected by CVE-2021-21921?

It affects 1 product.


Products: Advantech R-Seenet.

## How do I fix CVE-2021-21921?

No fix has been published for CVE-2021-21921 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-21921 being exploited?

There is no known exploitation of CVE-2021-21921 in the wild and no public exploit code.

## Other vulnerabilities in Advantech

- [CVE-2023-5642](https://insights.sbomify.com/CVE-2023-5642/): Advantech R-SeeNet Unauthenticated Read/Write (critical 9.8)
- [CVE-2023-2611](https://insights.sbomify.com/CVE-2023-2611/): Advantech R-SeeNet Use of Hard-coded Credentials (critical 9.8)
- [CVE-2022-3385](https://insights.sbomify.com/CVE-2022-3385/): Memory corruption in R-SeeNet (critical 9.8)
- [CVE-2022-3386](https://insights.sbomify.com/CVE-2022-3386/): Memory corruption in R-SeeNet (critical 9.8)
- [CVE-2021-21805](https://insights.sbomify.com/CVE-2021-21805/): Command injection in Advantech (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-21921 and fix it if it is affected.

What it is: CVE-2021-21921 is a high-severity SQL injection vulnerability in Advantech, published on 22 Dec 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-2021-21921 in the wild and no public exploit code.

Affected product: Advantech. 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-2021-21921/ (Markdown: https://insights.sbomify.com/CVE-2021-21921/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-21921
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-21921
- OSV: https://osv.dev/vulnerability/CVE-2021-21921

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-21921/
Summaries are generated and may contain mistakes; the official description above is the record.