# CVE-2026-29126: World-Writable, Root Owned/Run `/etc/udhcpc/default.script` in IDC SFX2100 Satellite Receiver Leads To Potential LPE

> A local attacker can escalate privileges to root by modifying a world-writable DHCP script on the IDC SFX2100 Satellite Receiver.

- **Severity:** High 8.5 (`CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:H/SI:H/SA:H/AU:N/R:U`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 5 Mar 2026
- **Updated:** 5 Mar 2026
- **Also known as:** GHSA-x4vv-6742-qcpf

## What is CVE-2026-29126?

CVE-2026-29126 is a high-severity vulnerability in International Datacasting Corporation SFX2100 Satellite Receiver, published on 5 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Incorrect permission assignment (world-writable file) in /etc/udhcpc/default.script in International Data Casting (IDC) SFX2100 Satellite Receiver allows a local unprivileged attacker to potentially execute arbitrary commands with root privileges (local privilege escalation and persistence) via modification of a root-owned, world-writable BusyBox udhcpc DHCP event script, which is executed when a DHCP lease is obtained, renewed, or lost.

Weakness: CWE-863 (Incorrect Authorization), CWE-732 (Incorrect Permission Assignment for Critical Resource)

## Which versions are affected by CVE-2026-29126?

It affects 1 product.


Products: Datacast Sfx2100 Firmware.

## How do I fix CVE-2026-29126?

No fix has been published for CVE-2026-29126 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-29126 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-29126 exists.

## Other vulnerabilities in International Datacasting Corporation SFX2100 Satellite Receiver

- [CVE-2026-28775](https://insights.sbomify.com/CVE-2026-28775/): Unauthenticated RCE via SNMP Default Writable Community String (critical 10.0)
- [CVE-2026-28773](https://insights.sbomify.com/CVE-2026-28773/): Authenticated OS Command Injection via Ping Utility Leading to RCE as Root (critical 9.3)
- [CVE-2026-28774](https://insights.sbomify.com/CVE-2026-28774/): Authenticated OS Command Injection via Traceroute Utility leads to Root RCE (critical 9.3)
- [CVE-2026-29127](https://insights.sbomify.com/CVE-2026-29127/): Incorrect Permission Assignment(777) on `monitor` Users Home Directory Containing SUID Root Binaries in IDC SFX2100 (critical 9.2)
- [CVE-2026-28777](https://insights.sbomify.com/CVE-2026-28777/): Hardcoded and Insecure Credentials for "User" Local Account with SSH Access On IDC SFX2100 Satellite Receiver (critical 9.2)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-29126 and fix it if it is affected.

What it is: CVE-2026-29126 is a high-severity vulnerability in International Datacasting Corporation SFX2100 Satellite Receiver, published on 5 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-29126 exists.

Affected product: International Datacasting Corporation SFX2100 Satellite Receiver. 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-2026-29126/ (Markdown: https://insights.sbomify.com/CVE-2026-29126/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-29126
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-29126
- OSV: https://osv.dev/vulnerability/CVE-2026-29126

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-29126/
Summaries are generated and may contain mistakes; the official description above is the record.