CVE-2021-33723Public exploitNetwork attack vector

Account takeover via unchecked profile update

Published Oct 12, 2021 · Updated Aug 3, 2024

Improper authorization in Siemens SINEC NMS before 1.0 SP2 Update 1 allows remote authenticated users to take over any account. The /edituserprofile route directly binds user-supplied JSON fields, including password, and does not verify that the requester owns the targeted account. Any authenticated user can supply an administrator's ID and username, replace that account's password, and gain administrative access.

CVSS severity8.8
High
EPSS probability0.62%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Improper authorization in Siemens SINEC NMS before 1.0 SP2 Update 1 allows remote authenticated users to take over any account. The /edituserprofile route directly binds user-supplied JSON fields, including password, and does not verify that the requester owns the targeted account. Any authenticated user can supply an administrator's ID and username, replace that account's password, and gain administrative access.

The record

CVE
CVE-2021-33723
Published
Oct 12, 2021
Updated
Aug 3, 2024
Vendor
Siemens
Product
SINEC NMS
Classifications
CWE-285, T1098
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 12, 2021CVE 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=All versions < V1.0 SP2 Update 1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Siemens · SINEC NMSversion=All versions < V1.0 SP2 Update 1

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
8.8Siemens AGCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.0NIST NVDAV:N/AC:L/Au:S/C:N/I:P/A:N

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 exploitPublished

Weakness, pattern, technique

CWE-285Improper Authorization
T1098Account Manipulation

Public exploit references

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo