# CVE-2026-12851: GeoVision GV-I/O Box 4E libNetSetObj.so OS command injection vulnerability

> Attackers can execute arbitrary OS commands on GeoVision GV-I/O Box 4E devices by sending crafted network packets to the DNS configuration service.

- **Severity:** Critical 9.1 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 24 Jun 2026
- **Updated:** 24 Jun 2026
- **Also known as:** GHSA-fx96-c5xr-q273

## What is CVE-2026-12851?

CVE-2026-12851 is a critical command injection vulnerability in GeoVision Inc. GV-I/O Box 4E, published on 24 Jun 2026. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

Multiple OS command injection vulnerabilities exist in the libNetSetObj.so functionality of GeoVision GV-I/O Box 4E 2.09. A specially crafted network packet can lead to command execution. An attacker can send a network request to trigger this vulnerability.

`libNetSetObj.so` is an internal library used by various binaries on the device to configure the network stack (start and stop various services, configure IP, Netmask, gateway, dns, etc.)

#### CNetSetObj::m_F_n_Set_DNS_Addr command injection

The following function can take up to two addresses, performs no sanitization and then calls `system`. This is a classic command injection vulnerability. The function is reachable from both the network-exposed `DVRSearch` service and the `Network.cgi` endpoint. 

    int __fastcall CNetSetObj::m_F_n_Set_DNS_Addr(CNetSetObj *this, char *dns1, char *dns2)

    {

      int result; // r0

      char v5[80]; // [sp+0h] [bp-50h] BYREF

      if ( !dns1 )

        result = 0;

      if ( dns1 )

      {

        sprintf(v5, "/bin/echo nameserver %s > /etc/resolv.conf", dns1);  // attacker controlled dns1 field

        system(v5);

        if ( dns2 )

        {

          sprintf(v5, "/bin/echo nameserver %s >> /etc/resolv.conf", dns2);

          system(v5);

        }

        return 1;

      }

      return result;

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

## Which versions are affected by CVE-2026-12851?


## How do I fix CVE-2026-12851?

No fix has been published for CVE-2026-12851 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-12851 being exploited?

There is no known exploitation of CVE-2026-12851 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-12851 and fix it if it is affected.

What it is: CVE-2026-12851 is a critical command injection vulnerability in GeoVision Inc. GV-I/O Box 4E, published on 24 Jun 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-12851 in the wild and no public exploit code.

Affected product: GeoVision Inc. GV-I/O Box 4E. 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-2026-12851/ (Markdown: https://insights.sbomify.com/CVE-2026-12851/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-12851
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-12851
- OSV: https://osv.dev/vulnerability/CVE-2026-12851

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-12851/
Summaries are generated and may contain mistakes; the official description above is the record.