# CVE-2021-27855: FatPipe software allows privilege escalation

> Remote authenticated attackers with read-only access can escalate to administrative privileges in FatPipe network software.

- **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 15 Dec 2021
- **Updated:** 17 Sep 2024
- **Also known as:** GHSA-53hg-58mg-7j38

## What is CVE-2021-27855?

CVE-2021-27855 is a high-severity vulnerability in FatPipe IPVPN, published on 15 Dec 2021. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

FatPipe WARP, IPVPN, and MPVPN software prior to versions 10.1.2r60p91 and 10.2.2r42 allows a remote, authenticated attacker with read-only privileges to grant themselves administrative privileges. Older versions of FatPipe software may also be vulnerable. The FatPipe advisory identifier for this vulnerability is FPSA001.

Weakness: CWE-862 (Missing Authorization)

## Which versions are affected by CVE-2021-27855?

It affects 3 products.


Products: Fatpipeinc Ipvpn Firmware, Fatpipeinc Mpvpn Firmware, Fatpipeinc Warp Firmware.

## How do I fix CVE-2021-27855?

No fix has been published for CVE-2021-27855 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-27855 being exploited?

There is no known exploitation of CVE-2021-27855 in the wild and no public exploit code.

## Other vulnerabilities in FatPipe IPVPN

- [CVE-2021-27860](https://insights.sbomify.com/CVE-2021-27860/): FatPipe WARP, IPVPN, and MPVPN Configuration Upload exploit (critical 9.8, exploited in the wild)
- [CVE-2021-27856](https://insights.sbomify.com/CVE-2021-27856/): FatPipe software administrative account with no password (critical 9.8)
- [CVE-2021-27859](https://insights.sbomify.com/CVE-2021-27859/): Missing authorization vulnerability in FatPipe software (high 8.8)
- [CVE-2021-27857](https://insights.sbomify.com/CVE-2021-27857/): FatPipe software allows unauthenticated configuration download (high 7.5)
- [CVE-2021-27858](https://insights.sbomify.com/CVE-2021-27858/): Missing authorization vulnerability in FatPipe software (medium 5.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-27855 and fix it if it is affected.

What it is: CVE-2021-27855 is a high-severity vulnerability in FatPipe IPVPN, published on 15 Dec 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-27855 in the wild and no public exploit code.

Affected product: FatPipe IPVPN. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2021-27855/ (Markdown: https://insights.sbomify.com/CVE-2021-27855/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-27855
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-27855
- OSV: https://osv.dev/vulnerability/CVE-2021-27855

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-27855/
Summaries are generated and may contain mistakes; the official description above is the record.