# CVE-2018-9192: Weak cryptography in FortiOS

> Attackers can recover plaintext or perform MiTM attacks on RSA PKCS #1 v1.5 encryption in FortiOS when SSL Deep Inspection is enabled.

- **Severity:** Medium 5.9 (`CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 5 Sep 2018
- **Updated:** 25 Oct 2024
- **Also known as:** GHSA-v3qq-w6xc-rjmw

## What is CVE-2018-9192?

CVE-2018-9192 is a medium-severity vulnerability in Fortinet Fortios, published on 5 Sep 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A plaintext recovery of encrypted messages or a Man-in-the-middle (MiTM) attack on RSA PKCS #1 v1.5 encryption may be possible without knowledge of the server's private key. Fortinet FortiOS 5.4.6 to 5.4.9, 6.0.0 and 6.0.1 are vulnerable by such attack under SSL Deep Inspection feature when CPx being used.

Weakness: CWE-203 (Observable Discrepancy)

## Which versions are affected by CVE-2018-9192?

It affects 1 product.


Products: Fortinet Fortios.

## How do I fix CVE-2018-9192?

No fix has been published for CVE-2018-9192 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-9192 being exploited?

There is no known exploitation of CVE-2018-9192 in the wild and no public exploit code.

## Other vulnerabilities in Fortinet Fortios

- [CVE-2024-23113](https://insights.sbomify.com/CVE-2024-23113/): Fortinet Multiple Products Format String (critical 9.8, exploited in the wild)
- [CVE-2022-40684](https://insights.sbomify.com/CVE-2022-40684/): Fortinet Multiple Products Authentication Bypass (critical 9.8, exploited in the wild)
- [CVE-2024-55591](https://insights.sbomify.com/CVE-2024-55591/): Fortinet FortiOS and FortiProxy Authentication Bypass (critical 9.6, exploited in the wild)
- [CVE-2024-21762](https://insights.sbomify.com/CVE-2024-21762/): Fortinet FortiOS Out-of-Bound Write (critical 9.6, exploited in the wild)
- [CVE-2022-42475](https://insights.sbomify.com/CVE-2022-42475/): Fortinet FortiOS Heap-Based Buffer Overflow (critical 9.3, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-9192 and fix it if it is affected.

What it is: CVE-2018-9192 is a medium-severity vulnerability in Fortinet Fortios, published on 5 Sep 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2018-9192 in the wild and no public exploit code.

Affected product: Fortinet Fortios. 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-2018-9192/ (Markdown: https://insights.sbomify.com/CVE-2018-9192/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-9192
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-9192
- OSV: https://osv.dev/vulnerability/CVE-2018-9192

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-9192/
Summaries are generated and may contain mistakes; the official description above is the record.