CVE intelligence and bounded remediation

CVE-2021-42021 — Siemens Siveillance Video Management Software 2019 R1 security vulnerability

High CVSS 7.5

A vulnerability has been identified in Siveillance Video DLNA Server (2019 R1), Siveillance Video DLNA Server (2019 R2), Siveillance Video DLNA Server (2019 R3), Siveillance Video DLNA Server (2020 R1), Siveillance Video DLNA Server (2020 R2), Siveillance Video DLNA Server (2020 R3), Siveillance Video DLNA Server (2021 R1). The affected application contains a path traversal vulnerability that could allow to read arbitrary files on the server that are outside the application’s web document directory. An unauthenticated remote attacker could exploit this issue to access sensitive information for subsequent attacks.

Severity
High
CVSS
7.5 (3.1)
Published
2021-11-09
CISA KEV
Not currently listed
Ecosystem
software/application
Weaknesses
CWE-26, CWE-22

Affected products

  • siemens / siveillance_video_management_software_2019_r1
  • siemens / siveillance_video_management_software_2019_r2
  • siemens / siveillance_video_management_software_2019_r3
  • siemens / siveillance_video_management_software_2020_r1
  • siemens / siveillance_video_management_software_2020_r2

Matched remediation archetype

Path traversal, unsafe upload, and file handling

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Check exposure

  • Trace untrusted filenames, archive entries, URLs, and path segments into read, write, include, extraction, and upload operations.
  • Identify filesystem roots, mount permissions, symbolic-link behavior, archive handling, and whether uploaded content is web-accessible or executable.
  • Review canonicalization and containment checks across supported operating systems and storage backends.

Remediate safely

  • Generate server-side storage identifiers and resolve paths beneath a fixed root using filesystem-aware containment checks.
  • Reject absolute, parent-relative, alternate-separator, device, link, and archive entries that escape the intended root.
  • Store uploads outside executable or served paths, validate type and size, and use private atomic temporary files.

Authoritative sources

Complete CVE record and remediation plan

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