# CVE-2021-41030: Auth bypass in Fortinet FortiClientEMS

> Unauthenticated attackers can impersonate users by replaying intercepted SAML messages in FortiClient EMS.

- **Severity:** Medium 5.4 (`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:F/RL:O/RC:C`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 8 Dec 2021
- **Updated:** 25 Oct 2024
- **Also known as:** GHSA-g3q6-jxj3-44v3

## What is CVE-2021-41030?

CVE-2021-41030 is a medium-severity authentication bypass vulnerability in Fortinet FortiClientEMS, published on 8 Dec 2021. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

An authentication bypass by capture-replay vulnerability [CWE-294] in FortiClient EMS versions 7.0.1 and below and 6.4.4 and below may allow an unauthenticated attacker to impersonate an existing user by intercepting and re-using valid SAML authentication messages.

Weakness: CWE-294 (Authentication Bypass by Capture-replay)

## Which versions are affected by CVE-2021-41030?

It affects 1 product.


Products: Fortinet Forticlient Enterprise Management Server.

## How do I fix CVE-2021-41030?

No fix has been published for CVE-2021-41030 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-41030 being exploited?

There is no known exploitation of CVE-2021-41030 in the wild and no public exploit code.

## Other vulnerabilities in Fortinet FortiClientEMS

- [CVE-2023-48788](https://insights.sbomify.com/CVE-2023-48788/): Fortinet FortiClient EMS SQL Injection (critical 9.3, exploited in the wild)
- [CVE-2023-45581](https://insights.sbomify.com/CVE-2023-45581/): Privilege escalation in FortiClientEMS (high 7.9)
- [CVE-2024-33508](https://insights.sbomify.com/CVE-2024-33508/): Command injection in FortiClientEMS (medium 6.9)
- [CVE-2021-36189](https://insights.sbomify.com/CVE-2021-36189/): Information disclosure in Fortinet FortiClientEMS (medium 6.8)
- [CVE-2020-15940](https://insights.sbomify.com/CVE-2020-15940/): Cross-site scripting in Fortinet FortiClientEMS (medium 4.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-41030 and fix it if it is affected.

What it is: CVE-2021-41030 is a medium-severity authentication bypass vulnerability in Fortinet FortiClientEMS, published on 8 Dec 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-41030 in the wild and no public exploit code.

Affected product: Fortinet FortiClientEMS. 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-2021-41030/ (Markdown: https://insights.sbomify.com/CVE-2021-41030/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-41030
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-41030
- OSV: https://osv.dev/vulnerability/CVE-2021-41030

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-41030/
Summaries are generated and may contain mistakes; the official description above is the record.