No exploitation reportedFix available

CVE-2023-28831

Q: Is CVE-2023-28831 actively exploited?

Active exploitation of CVE-2023-28831 has not been confirmed. Its EPSS score was 1.1% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2023-28831?

CVE-2023-28831 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

No exploitation reported by the sources we read.

Published2023-09-12
Fixed in2.2
WeaknessCWE-190

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

The OPC UA implementations (ANSI C and C++) in affected products contain an integer overflow vulnerability that could cause the application to run into an infinite loop during certificate validation. This could allow an unauthenticated remote attacker to create a denial of service condition by sending a specially crafted certificate.

Timeline

dates in UTC

2023-09-1210:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2023-28831?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2023-28831?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Siemens simatic cloud connect 7 cc712 firmwareversion to verify

Branch	Affected	Fixed in	Source
2.2	< 2.2	2.2	NVD

Siemens simatic cloud connect 7 cc716 firmwareversion to verify

Branch	Affected	Fixed in	Source
2.2	< 2.2	2.2	NVD

Siemens simatic drive controller cpu 1504d tf firmwareversion to verify

Branch	Affected	Fixed in	Source
2.2	< 2.2	2.2	NVD

75 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

ICSA-23-348-06 CISA2 known affected
Siemens OPC UA Implementation in SINUMERIK ONE and SINUMERIK MC
SINUMERIK MC · SINUMERIK ONE
ICSA-23-257-01 CISA143 known affected
Siemens SIMATIC, SIPLUS Products
SIMATIC BRAUMAT · SIMATIC Cloud Connect 7 CC712 (6GK1411-1AC00) · SIMATIC Cloud Connect 7 CC716 (6GK1411-5AC00) · +140 more

Full record on NVD

Fix

Update Siemens simatic cloud connect 7 cc712 firmware to 2.2
Vendor fix CISA ICSA-23-348-06 · 1 productUpdate to V1.22 or later version
Vendor fix CISA ICSA-23-348-06 · 1 productUpdate to V6.22 or later version
Vendor fix CISA ICSA-23-257-01 · 1 productUpdate to V16 Update 8 or later version
Vendor fix CISA ICSA-23-257-01 · 1 productUpdate to V17 SP1 Update 1 or later version
Vendor fix CISA ICSA-23-257-01 · 1 productUpdate to V18 Update 1 or later version
Vendor fix CISA ICSA-23-257-01 · 1 productUpdate to V19 Update 2 or later version

Advisories and patches

cert-portal.siemens.comMitigation · Vendor Advisory
cert-portal.siemens.comMitigation · Vendor Advisory
cert-portal.siemens.comMitigation · Vendor Advisory
cert-portal.siemens.comVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

CISA-ADPSSVC decisionnone2025-06-25
OpenCVESSVC decisionnone—
CNACVSS 4.08.7read 2026-10-23
CNACVSS 3.17.5read 2026-10-23
NVDCVSS 3.17.5read 2026-10-23
CNAweakness (CWE)CWE-190read 2026-10-23
NVDweakness (CWE)CWE-190read 2026-10-23
FIRST EPSSEPSS score1.1 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 4.0 vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published: 2023-09-12
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2023-28831?

Is CVE-2023-28831 actively exploited?

Active exploitation of CVE-2023-28831 has not been confirmed. Its EPSS score was 1.1% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2023-28831?

CVE-2023-28831 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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