5 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:N/AC:L/Au:N/C:P/I:N/A:N
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
7.8 High
AI Score
Confidence
High
0.003 Low
EPSS
Percentile
71.0%
Successful exploitation of this vulnerability could allow access to sensitive information on the DLNA server.
The following versions of Siveillance Video DLNA Server, a video DLNA server, are affected:
The affected application contains a path traversal vulnerability that could allow the reading of arbitrary files on the server located outside the applicationβs web document directory. An unauthenticated remote attacker could exploit this vulnerability to access sensitive information for subsequent attacks.
CVE-2021-42021 has been assigned to this vulnerability. A CVSS v3 base score of 8.6 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N).
Milestone PSIRT reported this vulnerability to Siemens.
Siemens has released updates for the DLNA server and recommends users apply the update on all installations where the DLNA server is used.
As a general security measure, Siemens strongly recommends protecting network access to affected products with appropriate mechanisms. It is advised to follow recommended security practices in order to run the devices in a protected IT environment.
For further inquiries on security vulnerabilities in Siemensβ products and solutions, please contact the Siemens ProductCERT.
Please see Siemens Security Advisory SSA-755517 for more information.
CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should:
CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
CISA also provides a section for control systems security recommended practices on the ICS webpage on us-cert.cisa.gov. Several recommended practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.
Additional mitigation guidance and recommended practices are publicly available on the ICS webpage on us-cert.cisa.gov in the Technical Information Paper, ICS-TIP-12-146-01BβTargeted Cyber Intrusion Detection and Mitigation Strategies.
Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to CISA for tracking and correlation against other incidents.
No known public exploits specifically target this vulnerability.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-42021
cert-portal.siemens.com/productcert/pdf/ssa-755517.pdf
cwe.mitre.org/data/definitions/26.html
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
support.industry.siemens.com/cs/ww/en/view/109766085/
support.industry.siemens.com/cs/ww/en/view/109769052/
support.industry.siemens.com/cs/ww/en/view/109773456/
support.industry.siemens.com/cs/ww/en/view/109779088/
support.industry.siemens.com/cs/ww/en/view/109781128/
support.industry.siemens.com/cs/ww/en/view/109791980/
support.industry.siemens.com/cs/ww/en/view/109801904/
twitter.com/CISAgov
twitter.com/intent/tweet?text=Siemens%20Siveillance%20Video%20DLNA%20Server+https://www.cisa.gov/news-events/ics-advisories/icsa-21-315-13
us-cert.cisa.gov/ics
us-cert.cisa.gov/ics
us-cert.cisa.gov/ics/alerts/ICS-ALERT-10-301-01
us-cert.cisa.gov/ics/recommended-practices
us-cert.cisa.gov/ics/tips/ICS-TIP-12-146-01B
us-cert.cisa.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf
www.dhs.gov
www.dhs.gov/foia
www.dhs.gov/performance-financial-reports
www.facebook.com/CISA
www.facebook.com/sharer/sharer.php?u=https://www.cisa.gov/news-events/ics-advisories/icsa-21-315-13&title=Siemens%20Siveillance%20Video%20DLNA%20Server
www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
www.instagram.com/cisagov
www.linkedin.com/company/cybersecurity-and-infrastructure-security-agency
www.linkedin.com/sharing/share-offsite/?url=https://www.cisa.gov/news-events/ics-advisories/icsa-21-315-13
www.oig.dhs.gov/
www.siemens.com/cert/advisories
www.surveymonkey.com/r/CISA-cyber-survey?product=https://www.cisa.gov/news-events/ics-advisories/icsa-21-315-13
www.usa.gov/
www.whitehouse.gov/
www.youtube.com/@cisagov
mailto:?subject=Siemens%20Siveillance%20Video%20DLNA%20Server&body=www.cisa.gov/news-events/ics-advisories/icsa-21-315-13
5 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:N/AC:L/Au:N/C:P/I:N/A:N
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
7.8 High
AI Score
Confidence
High
0.003 Low
EPSS
Percentile
71.0%