Weak PRNG in PowerG Encryption Allows Packet Injection

Publication date: 2025-12-22

Last updated on: 2025-12-22

Assigner: Johnson Controls

Description

Use of a weak pseudo-random number generator, which may allow an attacker to read or inject encrypted PowerG packets.

CVSS Scores

EPSS Scores

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Meta Information

Published

2025-12-22

Last Modified

2025-12-22

Generated

2026-07-06

AI Q&A

2025-12-23

EPSS Evaluated

2026-07-05

NVD

CVE-2025-26379

EUVD

EUVD-2025-204711

Affected Vendors & Products

Vendor	Product	Version / Range
johnson_controls	building_management_systems	4.0

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-338	The product uses a Pseudo-Random Number Generator (PRNG) in a security context, but the PRNG's algorithm is not cryptographically strong.

Attack-Flow Graph

Executive Summary

This vulnerability involves the use of a weak pseudo-random number generator in the encryption of PowerG packets. Because the random number generator is weak, an attacker may be able to predict or reproduce the encryption keys, allowing them to read or inject encrypted PowerG packets.

Impact Analysis

The vulnerability can allow an attacker to intercept and read encrypted PowerG packets or inject malicious packets into the communication. This can lead to unauthorized access, data manipulation, or disruption of services relying on PowerG communications.

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