CVE-2021-42021

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.

Published: 2021-11-09 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-42021 is rated Moderate Risk (56.6/100): CVSS High severity, with medium exploitation likelihood (EPSS 1.69%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2021-42021

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 1.00% 1.69% +0.69%
2 2025-03-30 1.92% 1.00% -0.92%
3 2025-03-29 — 1.92% —

Full EPSS history (13 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-42021

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 3.6 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:P/I:N/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2021-42021

Affected software / configurations for CVE-2021-42021

Vendor Product Version Raw CPE
siemens siveillance_video_management_software_2019_r1 — cpe:2.3:a:siemens:siveillance_video_management_software_2019_r1:*:*:*:*:*:*:*:*
siemens siveillance_video_management_software_2019_r2 — cpe:2.3:a:siemens:siveillance_video_management_software_2019_r2:*:*:*:*:*:*:*:*
siemens siveillance_video_management_software_2019_r3 — cpe:2.3:a:siemens:siveillance_video_management_software_2019_r3:*:*:*:*:*:*:*:*
siemens siveillance_video_management_software_2020_r1 — cpe:2.3:a:siemens:siveillance_video_management_software_2020_r1:-:*:*:*:*:*:*:*
siemens siveillance_video_management_software_2020_r2 — cpe:2.3:a:siemens:siveillance_video_management_software_2020_r2:-:*:*:*:*:*:*:*

References for CVE-2021-42021

cvelogic Threat Intelligence