CVE-2021-44524Network attack vector

Account impersonation via exposed authentication service

Published Dec 14, 2021 · Updated Aug 4, 2024

Authentication bypass in Siemens SiPass integrated and Siveillance Identity allows remote attackers to act as valid user accounts. The applications expose their internal user authentication service without sufficiently restricting which unauthenticated network requests can reach it. No account is required; successful requests trigger supported account actions under another user's identity, with no reported direct disclosure or service interruption.

CVSS severity9.8
Critical
EPSS probability1.58%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Siemens SiPass integrated and Siveillance Identity allows remote attackers to act as valid user accounts. The applications expose their internal user authentication service without sufficiently restricting which unauthenticated network requests can reach it. No account is required; successful requests trigger supported account actions under another user's identity, with no reported direct disclosure or service interruption.

The record

CVE
CVE-2021-44524
Published
Dec 14, 2021
Updated
Aug 4, 2024
Vendor
Siemens
Product
Siveillance Identity
Classifications
CWE-668, CWE-287, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 14, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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
  2. Affected versionversion=All versions < V1.6.284.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Siemens · Siveillance Identityversion=All versions; version=All versions < V1.6.284.0
Siemens · SiPass integratedversion=All versions

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-668Exposure of Resource to Wrong Sphere
CWE-287Improper Authentication
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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