CVE-2020-25237Network attack vector

Authenticated SYSTEM code execution via Zip-Slip overwrite

Published Feb 9, 2021 · Updated Aug 4, 2024

Zip-Slip in Siemens SINEC NMS before 1.0 SP1 Update 1 and SINEMA Server before 14.0 SP2 Update 2 allows remote authenticated users to write files. During extraction, the affected software accepts relative archive-entry paths that escape the target directory; ZDI identifies SINEC NMS's FirmwareFileUtils class as the faulty locus. A low-privileged account and crafted ZIP upload are required, and arbitrary file placement can overwrite system files or execute code as SYSTEM.

CVSS severity8.1
High
EPSS probability20.62%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Zip-Slip in Siemens SINEC NMS before 1.0 SP1 Update 1 and SINEMA Server before 14.0 SP2 Update 2 allows remote authenticated users to write files. During extraction, the affected software accepts relative archive-entry paths that escape the target directory; ZDI identifies SINEC NMS's FirmwareFileUtils class as the faulty locus. A low-privileged account and crafted ZIP upload are required, and arbitrary file placement can overwrite system files or execute code as SYSTEM.

The record

CVE
CVE-2020-25237
Published
Feb 9, 2021
Updated
Aug 4, 2024
Vendor
Siemens
Product
SINEC NMS
Classifications
CWE-22, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 9, 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 < V1.0 SP1 Update 1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Siemens · SINEC NMSversion=All versions < V1.0 SP1 Update 1
Siemens · SINEMA Serverversion=All versions < V14.0 SP2 Update 2

Published CVSS scores

8.8Zero Day InitiativeCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5NIST NVDAV:N/AC:L/Au:S/C:N/I:P/A:P
8.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/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-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1190Exploit Public-Facing Application

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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