# CVE-2025-34049: OptiLink ONT1GEW GPON Remote Code Execution

> An authenticated attacker can inject OS commands via the web interface to execute arbitrary code with root privileges on OptiLink GPON routers.

- **Severity:** Critical 9.4 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 26 Jun 2025
- **Updated:** 7 Apr 2026
- **Also known as:** GHSA-53rj-48p2-7m5j

## What is CVE-2025-34049?

CVE-2025-34049 is a critical command injection vulnerability in OptiLink ONT1GEW GPON, published on 26 Jun 2025. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

An OS command injection vulnerability exists in the OptiLink ONT1GEW GPON router firmware version V2.1.11_X101 Build 1127.190306 and earlier. The router’s web management interface fails to properly sanitize user input in the target_addr parameter of the formTracert and formPing administrative endpoints. An authenticated attacker can inject arbitrary operating system commands, which are executed with root privileges, leading to remote code execution. Successful exploitation enables full compromise of the device. Exploitation evidence was observed by the Shadowserver Foundation on 2025-02-04 UTC.

Weakness: CWE-78 (Improper Neutralization of Special Elements used in an OS Command)

## Which versions are affected by CVE-2025-34049?


## How do I fix CVE-2025-34049?

No fix has been published for CVE-2025-34049 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-34049 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-34049 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-34049 and fix it if it is affected.

What it is: CVE-2025-34049 is a critical command injection vulnerability in OptiLink ONT1GEW GPON, published on 26 Jun 2025. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-34049 exists.

Affected product: OptiLink ONT1GEW GPON. 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-2025-34049/ (Markdown: https://insights.sbomify.com/CVE-2025-34049/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-34049
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-34049
- OSV: https://osv.dev/vulnerability/CVE-2025-34049

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-34049/
Summaries are generated and may contain mistakes; the official description above is the record.