CVE-2021-36205Network attack vector

Session token reuse after logout

Published Apr 15, 2022 · Updated Sep 16, 2024

Incomplete cleanup in Johnson Controls Metasys allows remote attackers to reuse a session token after logout. The logout process can leave the session token valid, allowing a subsequent request to continue the prior session; the exact code path is not publicly described. The issue affects all Metasys 10 versions before 10.1.5 and 11 versions before 11.0.2, with network access required and confidentiality, integrity, and availability impact.

CVSS severity8.1
High
EPSS probability1.04%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incomplete cleanup in Johnson Controls Metasys allows remote attackers to reuse a session token after logout. The logout process can leave the session token valid, allowing a subsequent request to continue the prior session; the exact code path is not publicly described. The issue affects all Metasys 10 versions before 10.1.5 and 11 versions before 11.0.2, with network access required and confidentiality, integrity, and availability impact.

The record

CVE
CVE-2021-36205
Published
Apr 15, 2022
Updated
Sep 16, 2024
Vendor
Johnson Controls
Product
Metasys
Classifications
CWE-459, T1539
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 15, 2022CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record 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=All 10 versions <10.1.5
  2. Affected versionversion=All 11 versions <11.0.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Johnson Controls · Metasysversion=All 10 versions <10.1.5; version=All 11 versions <11.0.2

Published CVSS scores

8.1Johnson ControlsCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-459Incomplete Cleanup
T1539Steal Web Session Cookie

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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