CVE-2026-21660

Credential disclosure via plaintext firmware storage

Published Feb 27, 2026 · Updated Feb 27, 2026

Plaintext credential storage in Johnson Controls FRICK Quantum HD 10.22 and earlier allows local users to extract email passwords from firmware. The firmware embeds email account credentials and stores their passwords without encryption, exposing reusable secrets when the firmware image is read. Local firmware access is required; the disclosed flaw exposes credentials but does not itself alter controller data or interrupt refrigeration control.

CVSS severity9.8
Critical
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Plaintext credential storage in Johnson Controls FRICK Quantum HD 10.22 and earlier allows local users to extract email passwords from firmware. The firmware embeds email account credentials and stores their passwords without encryption, exposing reusable secrets when the firmware image is read. Local firmware access is required; the disclosed flaw exposes credentials but does not itself alter controller data or interrupt refrigeration control.

The record

CVE
CVE-2026-21660
Published
Feb 27, 2026
Updated
Feb 27, 2026
Vendor
Johnson Controls
Product
FRICK Quantum HD
Classifications
CWE-256, CWE-522, T1552.001
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Frick Controls Quantum HD version 10.22 and prior

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Johnson Controls · FRICK Quantum HDversion=Frick Controls Quantum HD version 10.22 and prior

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
6.9Johnson ControlsCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-256Plaintext Storage of a Password
CWE-522Insufficiently Protected Credentials
T1552.001Unsecured Credentials: Credentials In Files

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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