# CVE-2019-14200: Das U-Boot stack overflow in rpc_lookup_reply

Source: https://junglewise.ai/threats/cve-2019-14200-das-u-boot-stack-overflow-in-rpc-lookup-reply  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2019-07-31. Updated: 2026-05-12  
License: CC BY 4.0 with a link back

CVE-2019-14200 · Severity: critical · CVSS 9.8 · Published 2019-07-31

A critical vulnerability exists in the U-Boot bootloader, which is widely used in embedded systems and networking hardware. An attacker could exploit this flaw to gain full control over a device during its startup process. This could lead to permanent device compromise, data theft, or a complete loss of service for the affected hardware.

Technologies: [Denx U-Boot](https://junglewise.ai/threats/technologies/u-boot), [Siemens ROX II](https://junglewise.ai/threats/technologies/rox-ii). Vendors: [Denx](https://junglewise.ai/threats/vendors/denx), [Siemens](https://junglewise.ai/threats/vendors/siemens).

## Quick answers

**Is CVE-2019-14200 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2019-14200 being exploited in the wild.

**How severe is CVE-2019-14200?** Critical severity, with a CVSS score of 9.8, published 31 July 2019.

**Which products and versions are affected?** Siemens ROX II before 2.17.1.

**Is there a fix for CVE-2019-14200?** A patch was published on 2026-05-12: Siemens released Ruggedcom Rox II V2.17.1 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2019-14200 attacked?** It is attacked over the network, in device firmware.

**Am I affected by CVE-2019-14200?** Check whether you run Denx U-Boot or Siemens ROX II at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A stack-based buffer overflow vulnerability exists in Das U-Boot through version 2019.07 within the nfs_handler reply helper function 'rpc_lookup_reply'. The flaw is caused by improper bounds checking when processing RPC lookup replies over the network via NFS. A remote, unauthenticated attacker can exploit this by sending specially crafted packets to a device running the vulnerable bootloader. Successful exploitation can lead to arbitrary code execution with high privileges, potentially allowing for a full system compromise before the operating system even loads. Siemens has identified this as affecting several Ruggedcom Rox II devices, with fixes available in version 2.17.1.

## Affected products

- Das U-Boot U-Boot through 2019.07
- Siemens Ruggedcom Rox II family before 2.17.1

## Timeline

- 2019-07-31: disclosed
- 2019-07-31: advisory: NVD published date
- 2026-05-12: patched: Siemens released Ruggedcom Rox II V2.17.1

## References

- [https://blog.semmle.com/uboot-rce-nfs-vulnerability/](https://blog.semmle.com/uboot-rce-nfs-vulnerability/)
- [https://gitlab.com/u-boot/u-boot](https://gitlab.com/u-boot/u-boot)
- [https://cert-portal.siemens.com/productcert/html/ssa-577017.html](https://cert-portal.siemens.com/productcert/html/ssa-577017.html)

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