CVE-2021-42021Network attack vector

Arbitrary file read via path traversal

Published Nov 9, 2021 · Updated Aug 4, 2024

Path traversal in Siemens Siveillance Video DLNA Server versions 2019 R1 through 2021 R1 allows remote attackers to read arbitrary files. The vulnerable request handling accepts pathname traversal sequences and serves files outside the configured web document directory. Unauthenticated network access is sufficient, so exposed servers can disclose sensitive information that supports subsequent attacks.

CVSS severity7.5
High
EPSS probability1.74%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in Siemens Siveillance Video DLNA Server versions 2019 R1 through 2021 R1 allows remote attackers to read arbitrary files. The vulnerable request handling accepts pathname traversal sequences and serves files outside the configured web document directory. Unauthenticated network access is sufficient, so exposed servers can disclose sensitive information that supports subsequent attacks.

The record

CVE
CVE-2021-42021
Published
Nov 9, 2021
Updated
Aug 4, 2024
Vendor
Siemens
Product
Siveillance Video DLNA Server
Classifications
CWE-22, CWE-26, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 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=2019 R1
  2. Affected versionversion=2019 R2
  3. Affected versionversion=2019 R3
  4. Affected versionversion=2020 R1
  5. Affected versionversion=2020 R2
  6. Affected versionversion=2020 R3
  7. Affected versionversion=2021 R1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Siemens · Siveillance Video DLNA Serverversion=2019 R1; version=2019 R2; version=2019 R3; version=2020 R1; version=2020 R2; version=2020 R3; version=2021 R1

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
5.0NIST NVDAV:N/AC:L/Au:N/C:P/I:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-26Path Traversal: '/dir/../filename'
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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