9.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5 High
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
0.002 Low
EPSS
Percentile
54.2%
Successful exploitation of this vulnerability could allow an unauthenticated user to read data, cause a denial of service, and tamper with alarm states.
The following versions of AVEVA Plant SCADA and AVEVA Telemetry Server are affected:
3.2.1 IMPROPER AUTHORIZATION CWE-285
The listed versions of AVEVA Plant SCADA and AVEVA Telemetry Server contain an improper authorization vulnerability, which if exploited, could allow an unauthenticated user to remotely read data, cause a denial-of-service condition, and tamper with alarm states.
CVE-2023-1256 has been assigned to this vulnerability. A CVSS v3 base score of 9.8 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).
UK’s National Cyber Security Centre (NCSC) reported this vulnerability to AVEVA.
AVEVA has released the following fixes for the following products:
For additional upgrade information, refer to the AVEVA Plant SCADA upgrade guide.
For more information on this vulnerability, including security updates, users should see security bulletin AVEVA-2023-002.
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 at cisa.gov/ics. Several CISA products detailing cyber defense best 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 at cisa.gov/ics in the technical information paper, ICS-TIP-12-146-01B–Targeted Cyber Intrusion Detection and Mitigation Strategies.
Organizations observing suspected malicious activity should follow established internal procedures and report 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-2023-1256
cisa.gov/ics
cisa.gov/ics
cwe.mitre.org/data/definitions/285.html
gcsresource.aveva.com/plantscada/WebHelp/plantscada2023/Content/Upgrading.html
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
softwaresupportsp.aveva.com/#/connectivityhub/details?id=4bbbab19-b1b2-4b0d-ba12-08dafa4ad12d
softwaresupportsp.aveva.com/#/producthub/details?id=8ad9833a-cc4e-4d45-9298-08dadcec1ff5
softwaresupportsp.aveva.com/#/producthub/details?id=a145b006-e73d-44d5-9299-08dadcec1ff5
twitter.com/CISAgov
twitter.com/intent/tweet?text=AVEVA%20Plant%20SCADA%20and%20AVEVA%20Telemetry%20Server+https://www.cisa.gov/news-events/ics-advisories/icsa-23-073-04
us-cert.cisa.gov/ics/Recommended-Practices
us-cert.cisa.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf
www.aveva.com/content/dam/aveva/documents/support/cyber-security-updates/SecurityBulletin_AVEVA-2023-002.pdf
www.cisa.gov/uscert/ics/alerts/ICS-ALERT-10-301-01
www.cisa.gov/uscert/ics/tips/ICS-TIP-12-146-01B
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-23-073-04&title=AVEVA%20Plant%20SCADA%20and%20AVEVA%20Telemetry%20Server
www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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-23-073-04
www.oig.dhs.gov/
www.surveymonkey.com/r/CISA-cyber-survey?product=https://www.cisa.gov/news-events/ics-advisories/icsa-23-073-04
www.usa.gov/
www.whitehouse.gov/
www.youtube.com/@cisagov
mailto:?subject=AVEVA%20Plant%20SCADA%20and%20AVEVA%20Telemetry%20Server&body=www.cisa.gov/news-events/ics-advisories/icsa-23-073-04
9.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5 High
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
0.002 Low
EPSS
Percentile
54.2%