# CVE-2025-8754: ABB Ability zenon missing authentication in Remote Transport Service

Source: https://junglewise.ai/threats/cve-2025-8754-abb-ability-zenon-missing-authentication-in-remote-transport  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-26. Updated: 2026-05-26  
License: CC BY 4.0 with a link back

CVE-2025-8754 · Severity: high · CVSS 7.5 · Published 2026-05-26

ABB Ability zenon is a software platform used for industrial automation and control in sectors such as energy, manufacturing, and water management. A vulnerability in its Remote Transport Service allows an unauthorized person on the same network to remotely reboot the system. This could lead to unexpected service interruptions, loss of real-time monitoring, and operational downtime in critical infrastructure environments.

Vendors: [ABB](https://junglewise.ai/threats/vendors/abb).

## Quick answers

**Is CVE-2025-8754 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-8754 being exploited in the wild.

**How severe is CVE-2025-8754?** High severity, with a CVSS score of 7.5, published 26 May 2026.

**Which products and versions are affected?** ABB Ability zenon 7.50 to 14.

**Is there a fix for CVE-2025-8754?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2025-8754 attacked?** It is attacked over the network.

**Am I affected by CVE-2025-8754?** Check whether you run ABB Ability zenon 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 'Missing Authentication for Critical Function' vulnerability (CWE-306) exists in the ABB zenon Remote Transport Service (zensyssrv.exe). While the service typically requires a pre-configured password, a flaw allows an unauthenticated attacker with network access to the system to bypass these checks and invoke the 'Reboot OS' function. This is a network-based attack that requires no user interaction or prior privileges. Successful exploitation results in a complete loss of availability for the target machine. ABB recommends restricting network access or disabling the zensyssrv.exe service if remote transport functionality is not required.

## Affected products

- ABB Ability zenon 7.50 to 14

## Timeline

- 2025-08-12: advisory: Initial ABB PSIRT advisory release
- 2026-05-26: advisory: CISA republication of advisory ICSA-26-146-03

## References

- [https://www.cisa.gov/news-events/ics-advisories/icsa-26-146-03](https://www.cisa.gov/news-events/ics-advisories/icsa-26-146-03)