CVE-2023-1256

published 2023-03-16 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-23525

cvss: 9.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.7%; EPSS 0.7% chance of exploitation in 30 days, percentile 52%
public exploits: 0; none known

The listed versions of AVEVA Plant SCADA and AVEVA Telemetry Server are vulnerable to an improper authorization exploit which could allow an unauthenticated user to remotely read data, cause denial of service, and tamper with alarm states.

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-23-073-04 updated 2023-03-29 cvss 9.8

AVEVA Plant SCADA and AVEVA Telemetry Server

AVEVA Plant SCADA 2023, AVEVA Plant SCADA 2020R2 <= 10
affected: vendor fix softwaresupportsp.aveva.com
AVEVA Telemetry Server 2020 R2 <= SP1
affected: vendor fix softwaresupportsp.aveva.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

CISA SSVC

Exploitation: none
Automatable: yes
Technical impact: total
Assessed: 21 mo ago (2025-01-16)

Exploit prediction

0.68% chance of exploitation in the next 30 days, higher than 52% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

AVEVA AVEVA Plant SCADA
AVEVA AVEVA Telemetry Server

References

cisa.gov /news-events/ics-advisories/icsa-23-073-04
third-party-advisory, us-government-resource

Sources

CVE List CVE-2023-1256
NVD CVE-2023-1256

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary