No exploitation reportedFix available

CVE-2023-32787

Q: Is CVE-2023-32787 actively exploited?

Active exploitation of CVE-2023-32787 has not been confirmed. Its EPSS score was 1.2% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2023-32787?

CVE-2023-32787 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.

Published2023-05-15
Fixed in2023-04-28
WeaknessCWE-400

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 Legacy Java Stack before 6f176f2 enables an attacker to block OPC UA server applications via uncontrolled resource consumption so that they can no longer serve client applications.

Timeline

dates in UTC

2023-05-1515:15CVE 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-2023-32787?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2023-32787?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Opcfoundation ua java legacy

Branch	Affected	Fixed in	Source
2023.x	< 2023-04-28	2023-04-28	NVD

Prosysopc ua historian

Branch	Affected	Fixed in	Source
1.2	< 1.2.0	1.2.0	NVD

Prosysopc ua modbus server

Branch	Affected	Fixed in	Source
1.4	< 1.4.20	1.4.20	NVD

1 more product in the sources.

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

Fix

Update Opcfoundation ua java legacy to 2023-04-28

Advisories and patches

files.opcfoundation.orgPatch · Vendor Advisory
github.comPatch

Detection

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

Sources

NVDCVSS 3.17.5read 2026-10-23
NVDweakness (CWE)CWE-400read 2026-10-23
FIRST EPSSEPSS score1.2 %2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2023-05-15
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2023-32787?

The OPC UA Legacy Java Stack before 6f176f2 enables an attacker to block OPC UA server applications via uncontrolled resource consumption so that they can no longer serve client applications.

Is CVE-2023-32787 actively exploited?

Active exploitation of CVE-2023-32787 has not been confirmed. Its EPSS score was 1.2% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2023-32787?

CVE-2023-32787 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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