Delta Electronics COMMGR weak PRNG allows remote code execution
Free public brief. The indicators, the detections with Splunk SPL already written (plus Elastic and KQL where they apply), and a Slack alert the next time this touches a vendor you run are in the app — free account, no card.
Weak session ID generation in Delta COMMGR enables remote arbitrary code execution; patch to v2.10.0.
Delta Electronics COMMGR, a software management platform used to manage virtual PLCs across critical infrastructure, contains a cryptographically weak pseudo-random number generator (PRNG) used to generate session IDs. An attacker can remotely brute-force valid session IDs and gain unauthenticated access to execute arbitrary code on the system without user interaction, with a CVSS v4 score of 9.3. COMMGR Version 1 (all versions) and COMMGR Version 2 prior to v2.10.0 are affected. The vulnerability is exploitable remotely with low attack complexity and no authentication required. Delta Electronics has released COMMGR v2.10.0 to address this issue; Version 1 has reached end-of-life and users should migrate. The vulnerability impacts critical sectors including energy, healthcare, communications, manufacturing, and government facilities worldwide. No active exploitation has been reported to CISA, but the ease of exploitation and high impact make immediate patching a priority for affected organizations.
Mentioned in this report
Detection guidance
Delta Electronics COMMGR Process Spawning Command Shell or Script Interpreter
Detects a process whose parent image path contains COMMGR spawning a shell, script host, or common LOLBin, which is consistent with post-exploitation code execution after session-ID brute force against Delta Electronics COMMGR. Auto-generated starting point — validate and tune in your environment before deploying. IOC matches can false-positive on shared infrastructure and decay as adversary infrastructure rotates.
title: Delta Electronics COMMGR Process Spawning Command Shell or Script Interpreter
description: Detects a process whose parent image path contains COMMGR spawning a
shell, script interpreter, or common LOLBin. This is consistent with arbitrary code
execution after an unauthenticated attacker hijacks a COMMGR session through the
weak session-ID PRNG. Generalises on the parent/child relation, not on specific
payloads.
tags:
- attack.initial-access
- attack.t1190
- attack.execution
logsource:
category: process_creation
product: windows
detection:
selection_parent:
ParentImage|contains: COMMGR
selection_child:
Image|endswith:
- \cmd.exe
- \powershell.exe
- \pwsh.exe
- \wscript.exe
- \cscript.exe
- \mshta.exe
- \rundll32.exe
- \regsvr32.exe
- \certutil.exe
- \bitsadmin.exe
- \curl.exe
condition: selection_parent and selection_child
falsepositives:
- COMMGR helper scripts or installers that legitimately launch cmd.exe during setup
or upgrade
- Administrators running maintenance batch files through COMMGR-related tooling
level: medium
id: 7c3a9953-586d-5546-8446-9c88e0277c46
status: experimental
author: Vorant
references:
- https://www.cisa.gov/news-events/ics-advisories/icsa-25-105-07
Behavioural rules are generated from public reporting — validate in your environment before deploying.
Source reporting: https://www.cisa.gov/news-events/ics-advisories/icsa-25-105-07
What this brief leaves out
This page is the free tier: the write-up, the severity, the names. In the app the same report carries its extracted indicators, its detections (Splunk SPL already written, plus Elastic and Microsoft KQL where they apply), the actors and CVEs it names as live profiles, and the vendor research on the same campaign — the primary source the news paraphrased, cited and read directly.
It sits in a corpus of 13,853 reports from 146 sources, 616 of them written in the last seven days, and it grows through the day.
A new account starts with three days of all of it, no card, then keeps the government and CERT reporting free. Name the vendors you run and Slack hears about the reports that touch them — about forty a week that are yours, not the four hundred that are not.
Create a free account What it costs