# CVE-2018-13376: Information disclosure in Fortinet FortiOS

> An uninitialized memory leak in FortiOS web proxy disclaimer pages allows attackers to view sensitive data in HTTP responses.

- **Severity:** High 7.5 (`CVSS:3.0/AV:N/AC:L/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:** 27 Nov 2018
- **Updated:** 25 Oct 2024
- **Also known as:** GHSA-2vhw-3h86-29h4

## What is CVE-2018-13376?

CVE-2018-13376 is a high-severity vulnerability in Fortinet Fortios, published on 27 Nov 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An uninitialized memory buffer leak exists in Fortinet FortiOS 5.6.1 to 5.6.3, 5.4.6 to 5.4.7, 5.2 all versions under web proxy's disclaimer response web pages, potentially causing sensitive data to be displayed in the HTTP response.

## Which versions are affected by CVE-2018-13376?

It affects 1 product.


Products: Fortinet Fortios.

## How do I fix CVE-2018-13376?

No fix has been published for CVE-2018-13376 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-13376 being exploited?

There is no known exploitation of CVE-2018-13376 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-2018-13376 and fix it if it is affected.

What it is: CVE-2018-13376 is a high-severity vulnerability in Fortinet Fortios, published on 27 Nov 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-2018-13376 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-2018-13376/ (Markdown: https://insights.sbomify.com/CVE-2018-13376/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-13376
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-13376
- OSV: https://osv.dev/vulnerability/CVE-2018-13376

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-13376/
Summaries are generated and may contain mistakes; the official description above is the record.