CVE-2022-33137Network attack vector

Authenticated session hijacking via stale logout tokens

Published Jul 12, 2022 · Updated Aug 3, 2024

Insufficient Session Expiration in Siemens SIMATIC MV500 devices before V3.3 allows authenticated remote attackers to hijack web sessions. The web session manager leaves session identifiers valid after certain logout scenarios, allowing a captured token to impersonate another user. Exploitation requires authenticated remote access and a token from the affected logout flow; resulting access inherits the victim session's privileges.

CVSS severity8.0
High
EPSS probability0.84%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Insufficient Session Expiration in Siemens SIMATIC MV500 devices before V3.3 allows authenticated remote attackers to hijack web sessions. The web session manager leaves session identifiers valid after certain logout scenarios, allowing a captured token to impersonate another user. Exploitation requires authenticated remote access and a token from the affected logout flow; resulting access inherits the victim session's privileges.

The record

CVE
CVE-2022-33137
Published
Jul 12, 2022
Updated
Aug 3, 2024
Vendor
Siemens
Product
SIMATIC MV550 H
Classifications
CWE-613, T1539
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 12, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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 versions < V3.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Siemens · SIMATIC MV550 Hversion=All versions < V3.3
Siemens · SIMATIC MV540 Sversion=All versions < V3.3
Siemens · SIMATIC MV560 Uversion=All versions < V3.3
Siemens · SIMATIC MV560 Xversion=All versions < V3.3
Siemens · SIMATIC MV550 Sversion=All versions < V3.3
Siemens · SIMATIC MV540 Hversion=All versions < V3.3

Published CVSS scores

8.0NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-613Insufficient Session Expiration
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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