CVE-2023-1256 | CVE-2023-1256

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.

Published: 2023-03-16 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2023-1256 is rated Moderate Risk (59/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 0.33%). 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-2023-1256

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 2026-05-15 0.15% 0.33% +0.18%
2 2025-12-09 0.12% 0.15% +0.03%
3 2025-11-21 — 0.12% —

Full EPSS history (10 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-1256

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H 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:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H 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:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]

Weakness enumeration for CVE-2023-1256

Affected software / configurations for CVE-2023-1256

Vendor Product Version Raw CPE
aveva aveva_plant_scada 2020r2 cpe:2.3:a:aveva:aveva_plant_scada:2020r2:-:*:*:*:*:*:*
aveva aveva_plant_scada 2020r2 cpe:2.3:a:aveva:aveva_plant_scada:2020r2:update_10:*:*:*:*:*:*
aveva aveva_plant_scada 2023 cpe:2.3:a:aveva:aveva_plant_scada:2023:-:*:*:*:*:*:*
aveva aveva_plant_scada 2023 cpe:2.3:a:aveva:aveva_plant_scada:2023:update_10:*:*:*:*:*:*
aveva telemetry_server 2020r2 cpe:2.3:a:aveva:telemetry_server:2020r2:-:*:*:*:*:*:*
aveva telemetry_server 2020r2 cpe:2.3:a:aveva:telemetry_server:2020r2:sp1:*:*:*:*:*:*

References for CVE-2023-1256

URL Tags
https://www.cisa.gov/news-events/ics-advisories/icsa-23-073-04 Third Party Advisory US Government Resource
cvelogic Threat Intelligence