# CVE-2025-48839: Memory corruption in FortiADC

> An authenticated attacker can execute arbitrary code on FortiADC devices via specially crafted HTTP requests exploiting an out-of-bounds write vulnerability.

- **Severity:** Medium 6.3 (`CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:C`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 18 Nov 2025
- **Updated:** 26 Feb 2026
- **Also known as:** GHSA-25x7-2m3g-jhfw

## What is CVE-2025-48839?

CVE-2025-48839 is a medium-severity memory corruption vulnerability in Fortinet FortiADC, published on 18 Nov 2025. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

An Out-of-bounds Write vulnerability [CWE-787] in FortiADC 8.0.0, 7.6.0 through 7.6.2, 7.4.0 through 7.4.7, 7.2 all versions, 7.1 all versions, 7.0 all versions, 6.2 all versions may allow an authenticated attacker to execute arbitrary code via specially crafted HTTP requests.

Weakness: CWE-787 (Out-of-bounds Write)

## Which versions are affected by CVE-2025-48839?

It affects 1 product.


Products: Fortinet Fortiadc.

## How do I fix CVE-2025-48839?

No fix has been published for CVE-2025-48839 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-48839 being exploited?

There is no known exploitation of CVE-2025-48839 in the wild and no public exploit code.

## Other vulnerabilities in Fortinet FortiADC

- [CVE-2018-13374](https://insights.sbomify.com/CVE-2018-13374/): Fortinet FortiOS and FortiADC Improper Access Control (medium 4.3, exploited in the wild)
- [CVE-2022-38374](https://insights.sbomify.com/CVE-2022-38374/): Cross-site scripting in Fortinet FortiADC (high 8.8)
- [CVE-2023-37933](https://insights.sbomify.com/CVE-2023-37933/): Cross-site scripting in FortiADC (high 8.6)
- [CVE-2022-39947](https://insights.sbomify.com/CVE-2022-39947/): Command injection in FortiADC (high 8.6)
- [CVE-2022-35851](https://insights.sbomify.com/CVE-2022-35851/): Cross-site scripting in Fortinet FortiADC (high 8.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-48839 and fix it if it is affected.

What it is: CVE-2025-48839 is a medium-severity memory corruption vulnerability in Fortinet FortiADC, published on 18 Nov 2025. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-48839 in the wild and no public exploit code.

Affected product: Fortinet FortiADC. 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-2025-48839/ (Markdown: https://insights.sbomify.com/CVE-2025-48839/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-48839
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-48839
- OSV: https://osv.dev/vulnerability/CVE-2025-48839

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-48839/
Summaries are generated and may contain mistakes; the official description above is the record.