CVE-2021-36204 [High] | Security Vulnerability in Metasys Application And D…

Under some circumstances an Insufficiently Protected Credentials vulnerability in Johnson Controls Metasys ADS/ADX/OAS 10 versions prior to 10.1.6 and 11 versions prior to 11.0.3 allows API calls to expose credentials in plain text.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.18%	0.42%	+0.24%
2	2026-01-15	0.26%	0.18%	-0.08%
3	2026-01-14	—	0.26%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.18%

0.42%

+0.24%

2026-01-15

0.26%

0.18%

-0.08%

2026-01-14

—

0.26%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
7.8	3.1	HIGH	`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H` Click to expand Attack vector (AV:L) They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:N) No account or special rights needed—anonymous or random user is enough. User interaction (UI:R) A real person has to do something—click, install, enable—otherwise it doesn’t land. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:H) Serious risk that confidential data gets exposed in a big way. Integrity (I:H) They could widely tamper with or forge data—trust in the data is badly hurt. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	1.8	5.9	[email protected]
7.5	3.1	HIGH	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:N) No account or special rights needed—anonymous or random user is enough. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:H) Serious risk that confidential data gets exposed in a big way. Integrity (I:N) Data isn’t meaningfully altered or forged. Availability (A:N) Service keeps running; no real outage angle.	3.9	3.6	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

7.8

3.1

HIGH

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

Attack vector (AV:L): They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N): No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R): A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H): Serious risk that confidential data gets exposed in a big way.
Integrity (I:H): They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

1.8

5.9

[email protected]

7.5

3.1

HIGH

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

Attack vector (AV:N): Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N): No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H): Serious risk that confidential data gets exposed in a big way.
Integrity (I:N): Data isn’t meaningfully altered or forged.
Availability (A:N): Service keeps running; no real outage angle.

3.9

3.6

[email protected]

Affected software / configurations for CVE-2021-36204

Vendor	Product	Version	Raw CPE
johnsoncontrols	metasys_application_and_data_server	>= 10.0, < 10.1.6	cpe:2.3:a:johnsoncontrols:metasys_application_and_data_server::::::::
johnsoncontrols	metasys_application_and_data_server	>= 11.0, < 11.0.3	cpe:2.3:a:johnsoncontrols:metasys_application_and_data_server::::::::
johnsoncontrols	metasys_extended_application_and_data_server	>= 10.0, < 10.1.6	cpe:2.3:a:johnsoncontrols:metasys_extended_application_and_data_server::::::::
johnsoncontrols	metasys_extended_application_and_data_server	>= 11.0, < 11.0.3	cpe:2.3:a:johnsoncontrols:metasys_extended_application_and_data_server::::::::
johnsoncontrols	metasys_open_application_server	>= 10.0, < 10.1.6	cpe:2.3:a:johnsoncontrols:metasys_open_application_server::::::::
johnsoncontrols	metasys_open_application_server	>= 11.0, < 11.0.3	cpe:2.3:a:johnsoncontrols:metasys_open_application_server::::::::

References for CVE-2021-36204

URL	Tags
https://www.cisa.gov/uscert/ics/advisories/icsa-23-012-06	Third Party Advisory US Government Resource
https://www.johnsoncontrols.com/cyber-solutions/security-advisories	Vendor Advisory

URL

CVE-2021-36204 | Insufficiently Protected Credentials in Metasys

Exploit prediction scoring system (EPSS) score for CVE-2021-36204

Common vulnerability scoring system (CVSS) metrics for CVE-2021-36204

Weakness enumeration for CVE-2021-36204

Affected software / configurations for CVE-2021-36204

References for CVE-2021-36204