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CVE-2020-9044

28
FAUCET Score

CVE-2020-9044 describes an XML External Entity (XXE) vulnerability in the Web Services of Johnson Controls' Metasys product family, impacting various versions of ADS, ADX, ODS, OAS, NAE, NIE, LCS, and SCT. This critical vulnerability, rated 9.1 CVSS, allows unauthenticated remote attackers to potentially launch Denial of Service (DoS) attacks or exfiltrate sensitive ASCII server files due to its network-based attack vector and low attack complexity. While there is no evidence of active exploitation or public exploit code (Metasploit, Nuclei, ExploitDB), the vulnerability has garnered significant community discussion, indicating awareness among security researchers.

Impacted Technologies

VendorProductVersion(s)CPE
<= 10.1CPE matchmatch criteria
cpe:2.3:a:johnsoncontrols:metasys_application_and_data_server:*:*:*:*:*:*:*:*
<= 10.1CPE matchmatch criteria
cpe:2.3:a:johnsoncontrols:metasys_application_and_data_server:*:*:*:*:lite:*:*:*
<= 10.1CPE matchmatch criteria
cpe:2.3:a:johnsoncontrols:metasys_extended_application_and_data_server:*:*:*:*:*:*:*:*
<= 10.1CPE matchmatch criteria
cpe:2.3:a:johnsoncontrols:metasys_lonworks_control_server:*:*:*:*:*:*:*:*
10.1CPE matchmatch criteria
cpe:2.3:a:johnsoncontrols:metasys_open_application_server:10.1:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.29%
Probability of exploitation in next 30 days
EPSS Percentile
67.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0129 is in the 54th percentile among its peer group of 36,835 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

johnsoncontrols.com / cyber-solutions/security-advisories
Vendor Advisory
us-cert.gov / ics/advisories/icsa-20-070-05
Third Party AdvisoryUS Government Resource