# CVE-2026-73171: Advantech EKI-1242IEIMS arbitrary file overwrite in backup-restore

Source: https://junglewise.ai/threats/cve-2026-73171-advantech-eki-1242ieims-arbitrary-file-overwrite-in-backup  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-16. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-73171 · Severity: info · CVSS 8.6 · Published 2026-09-16

Advantech EKI-1242IEIMS is a network management device used in industrial and enterprise environments. An authenticated attacker can upload a malicious backup file through the web interface to overwrite critical system files, potentially compromising device integrity, availability, and confidentiality of operational data.

Technologies: [Advantech EKI-1242EIMS](https://junglewise.ai/threats/technologies/eki-1242eims), [Advantech EKI-1242IEIMS](https://junglewise.ai/threats/technologies/eki-1242ieims). Vendors: [Advantech](https://junglewise.ai/threats/vendors/advantech).

## Quick answers

**Is CVE-2026-73171 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-73171 being exploited in the wild.

**How severe is CVE-2026-73171?** Informational severity, with a CVSS score of 8.6, published 16 September 2026.

**Which products and versions are affected?** Advantech EKI-1242EIMS V1.06.01; Advantech EKI-1242IEIMS V1.06.01.

**Is there a fix for CVE-2026-73171?** A patch was published on 2026-09-04: Firmware version 2.00.01 available Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-73171 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-73171?** Check whether you run Advantech EKI-1242EIMS or Advantech EKI-1242IEIMS 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

This vulnerability is a CWE-73: External Control of File Name or Path flaw in the backup-restore workflow. An authenticated attacker can craft a backup archive with path traversal sequences to overwrite arbitrary files on the device filesystem when the archive is extracted during restoration. The attack requires network access to the web management interface and valid credentials, but no user interaction is needed beyond uploading the malicious file. Successful exploitation allows complete file system manipulation, potentially leading to privilege escalation, code execution, or denial of service. A patch is available: firmware version 2.00.01 or later resolves the issue.

## Affected products

- Advantech EKI-1242IEIMS V1.06.01
- Advantech EKI-1242EIMS V1.06.01

## Timeline

- 2026-09-16: disclosed
- 2026-09-04: patched: Firmware version 2.00.01 available

## References

- [https://advcloudfiles.advantech.com/cms/5dafee28-ad53-4d07-a328-7896fcc24b6e/Security%20Advisory%20PDF%20File/SECURITY-ADVISORY----EKI-1242IEIMS-updated-20260904.pdf](https://advcloudfiles.advantech.com/cms/5dafee28-ad53-4d07-a328-7896fcc24b6e/Security%20Advisory%20PDF%20File/SECURITY-ADVISORY----EKI-1242IEIMS-updated-20260904.pdf)
- [https://www.nozominetworks.com/labs/vulnerability-advisories-cve-2026-73171](https://www.nozominetworks.com/labs/vulnerability-advisories-cve-2026-73171)

## Related threats

- [Advantech EKI-1242EIMS firmware signature verification bypass](https://junglewise.ai/threats/cve-2026-73177-advantech-eki-1242eims-firmware-signature-verification-bypass)
- [Advantech EKI-1242IEIMS OS command injection in web management interface](https://junglewise.ai/threats/cve-2026-73176-advantech-eki-1242ieims-os-command-injection-in-web-management)
- [Advantech EKI-1242 denial of service in OPC UA gateway](https://junglewise.ai/threats/cve-2026-73175-advantech-eki-1242-denial-of-service-in-opc-ua-gateway)
- [Advantech EKI-1242 cleartext transmission of sensitive information](https://junglewise.ai/threats/cve-2026-73174-advantech-eki-1242-cleartext-transmission-of-sensitive)
- [Advantech EKI-1242IEIMS missing authentication in management protocol](https://junglewise.ai/threats/cve-2026-73173-advantech-eki-1242ieims-missing-authentication-in-management)