# CVE-2019-14195: Das U-Boot stack overflow in nfs_readlink_reply

Source: https://junglewise.ai/threats/cve-2019-14195-das-u-boot-stack-overflow-in-nfs-readlink-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-2019-14195 · Severity: critical · CVSS 9.8 · Published 2019-07-31

A critical vulnerability exists in U-Boot, a widely used bootloader for embedded devices and industrial hardware. An attacker could exploit this flaw over a network to execute unauthorized code or crash the system during the boot process. This could lead to complete device takeover, loss of operational control, or permanent disruption of industrial equipment.

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-2019-14195 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2019-14195 being exploited in the wild.

**How severe is CVE-2019-14195?** Critical severity, with a CVSS score of 9.8, published 31 July 2019.

**Which products and versions are affected?** Siemens ROX II before V2.17.1.

**Is there a fix for CVE-2019-14195?** A patch was published on 2026-05-12: Siemens released advisory SSA-577017 for Ruggedcom Rox products Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2019-14195 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2019-14195?** 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

An out-of-bounds write (CWE-787) exists in Das U-Boot through version 2019.07 within the nfs_readlink_reply function. The vulnerability is caused by an unbounded memcpy operation where the length of a new path is not properly validated before being copied into a buffer. A remote attacker on the same network could provide a specially crafted NFS reply to trigger a buffer overflow. This can result in arbitrary code execution or a denial-of-service condition during the pre-boot environment. Siemens has identified this as affecting several RUGGEDCOM ROX II devices, which should be updated to V2.17.1 or later.

## Affected products

- Das U-Boot U-Boot through 2019.07
- Siemens Corproation RUGGEDCOM ROX II family before V2.17.1

## Timeline

- 2019-07-31: disclosed
- 2019-07-31: advisory: NVD published CVE-2019-14195
- 2026-05-12: patched: Siemens released advisory SSA-577017 for Ruggedcom Rox products

## 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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