# CVE-2023-42782: Auth bypass in FortiAnalyzer

> Remote unauthenticated attackers can inject messages into FortiAnalyzer syslog by spoofing authorized device serial numbers, compromising log integrity.

- **Severity:** Medium 5.0 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:X/RC:C`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 10 Oct 2023
- **Updated:** 18 Sep 2024
- **Also known as:** GHSA-g4h5-9rrr-q667

## What is CVE-2023-42782?

CVE-2023-42782 is a medium-severity authentication bypass vulnerability in Fortinet Fortianalyzer, published on 10 Oct 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A insufficient verification of data authenticity vulnerability [CWE-345] in FortiAnalyzer version 7.4.0 and below 7.2.3 allows a remote unauthenticated attacker to send messages to the syslog server of FortiAnalyzer via the knoweldge of an authorized device serial number.

Weakness: CWE-345 (Insufficient Verification of Data Authenticity)

## Which versions are affected by CVE-2023-42782?

It affects 1 product.


Products: Fortinet Fortianalyzer.

## How do I fix CVE-2023-42782?

No fix has been published for CVE-2023-42782 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-42782 being exploited?

There is no known exploitation of CVE-2023-42782 in the wild and no public exploit code.

## Other vulnerabilities in Fortinet Fortianalyzer

- [CVE-2026-24858](https://insights.sbomify.com/CVE-2026-24858/): Fortinet Multiple Products Authentication Bypass Using an Alternate Path or Channel (critical 9.4, exploited in the wild)
- [CVE-2023-25610](https://insights.sbomify.com/CVE-2023-25610/): Memory corruption in FortiAnalyzer (critical 9.3)
- [CVE-2021-32603](https://insights.sbomify.com/CVE-2021-32603/): Server-side request forgery in Fortinet FortiAnalyzer, FortiManager (high 8.8)
- [CVE-2020-12817](https://insights.sbomify.com/CVE-2020-12817/): Cross-site scripting in Fortinet FortiAnalyzer (high 8.8)
- [CVE-2024-48886](https://insights.sbomify.com/CVE-2024-48886/): Auth bypass in FortiOS (high 8.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-42782 and fix it if it is affected.

What it is: CVE-2023-42782 is a medium-severity authentication bypass vulnerability in Fortinet Fortianalyzer, published on 10 Oct 2023. 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-2023-42782 in the wild and no public exploit code.

Affected product: Fortinet Fortianalyzer. 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-2023-42782/ (Markdown: https://insights.sbomify.com/CVE-2023-42782/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-42782
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-42782
- OSV: https://osv.dev/vulnerability/CVE-2023-42782

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-42782/
Summaries are generated and may contain mistakes; the official description above is the record.