Is CVE-2026-21660 actively exploited?

No active exploitation of CVE-2026-21660 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-21660 be exploited remotely?

Yes. CVE-2026-21660 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-21660?

CVE-2026-21660 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2026-21660

CRITICAL

CVE-2026-21660

CWE-256Published: February 27, 2026· Updated: Jun 17, 2026

9.8

CVSS v3.1

EPSS:0.03%probability of exploitation in 30 daysPercentile:9.3th

Official Description

Hardcoded Email Credentials Saved as Plaintext in Firmware (CWE-256: Plaintext Storage of a Password) vulnerability in Frick Controls Quantum HD version 10.22 and prior lead to unauthorized access, exposure of sensitive information, and potential misuse or system compromise

This issue affects Frick Controls Quantum HD version 10.22 and prior.

NVD Source

Risk Analysis

This critical vulnerability in Frick Controls Quantum HD firmware involves hardcoded email credentials stored in plaintext, leading to unauthorized access and potential system compromise. With a CVSS score of 9.8, this flaw is highly severe, enabling full control over confidentiality, integrity, and availability, though its exploitation likelihood is currently unknown as no EPSS score is available.

No public exploit is currently known for this vulnerability. The remote attack vector and low attack complexity indicate it is remotely exploitable without authentication.

Recommended Action

To mitigate this vulnerability, update Frick Controls Quantum HD firmware to a version beyond 10.22. Avoid hardcoding credentials and ensure sensitive information is stored securely.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2026-21660 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.None

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

johnsoncontrols2 product(s)

frick controls quantum hd firmwarefrick controls quantum hd

Source: NVD CPE · 2 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time

Exploit-DB

Offensive Security exploit database

GitHub PoC Search

Community PoC repositories

Rapid7 / Metasploit

Metasploit module search

PacketStorm

Security advisories & exploits

External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://www.cisa.gov/news-events/ics-advisories/icsa-26-057-01

ADVISORYhttps://www.johnsoncontrols.com/trust-center/cybersecurity/security-advisories

News & Research Mentioning CVE-2026-21660

Johnson Controls, Inc. Frick Controls Quantum HD

CISA Alerts· Feb 26, 2026

View CSAF Summary Successful exploitation of these vulnerabilities can lead to pre-authentication remote code execution, information leak or denial of service. The following versions of Johnson Controls, Inc. Frick Controls Quantum HD are affected: Frick Controls Quantum HD <=10.22 (CVE-2026-21654, CVE-2026-21656, CVE-2026-21657, CVE-2026-21658, CVE-2026-21659, CVE-2026-21660) CVSS Vendor Equipment Vulnerabilities v3 9.1 Johnson Controls, Inc. Johnson Controls, Inc. Frick Controls Quantum HD Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'), Improper Control of Generation of Code ('Code Injection'), Relative Path Traversal, Plaintext Storage of a Password Background Critical Infrastructure Sectors: Food and Ag [xlite_meta score:63 src:CISA Alerts xlite_fp:1c4d1338a6385f943a8d6d9d05aea6964ee2c0f60d6e43be5e3291a09e5bbefe]