HOMEVULNERABILITIESCVE-2021-42021
HIGH

CVE-2021-42021

CWE-26Published: November 9, 2021· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official Description

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.

NVD Source

Technical Analysis

CVE-2021-42021 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected Vendors & Products

siemens6 product(s)
siveillance video management software 2019 r1siveillance video management software 2019 r2siveillance video management software 2019 r3siveillance video management software 2020 r1siveillance video management software 2020 r2siveillance video dlna server
Source: NVD CPE · 6 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://cert-portal.siemens.com/productcert/pdf/ssa-755517.pdf
PATCHhttps://cert-portal.siemens.com/productcert/pdf/ssa-755517.pdf

All References (2)

→
https://cert-portal.siemens.com/productcert/pdf/ssa-755517.pdfPatch · Third Party Advisory
→
https://cert-portal.siemens.com/productcert/pdf/ssa-755517.pdfPatch · Third Party Advisory

Quick Facts

CVE IDCVE-2021-42021
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-26
CISA KEVNo
Affected1 vendor(s)
PublishedNov 9, 2021

Related CVEs (CWE-26)

CVE-2024-28064
9.8
CVE-2024-29466
8.8
CVE-2025-53908
8.3
CVE-2021-34762
8.1
CVE-2024-25466
7.8
CVE-2024-31551
7.5

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-42021 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
← All Vulnerabilities·Search for CVE-2021-42021·NVD