Opto 22 SoftPAC Project Version 9.6 and prior.

published 2020-05-14 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-3068

cvss: 9.8; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.2%; EPSS 1.2% chance of exploitation in 30 days, percentile 68%
public exploits: 0; none known

Opto 22 SoftPAC Project Version 9.6 and prior. SoftPAC communication does not include any credentials. This allows an attacker with network access to directly communicate with SoftPAC, including, for example, stopping the service remotely.

Vendor advisories

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

cisa ICSA-20-135-01 updated 2020-05-14 cvss 9.8

Opto 22 SoftPAC Project

Opto 22 SoftPAC Project <= 9.6
affected: mitigation “Opto 22 released PAC Project 10.3 it is available for download” opto22.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

Exploit prediction

1.21% chance of exploitation in the next 30 days, higher than 68% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	7.5	AV:N/AC:L/Au:N/C:P/I:P/A:P

Affected products

n/a Opto 22 SoftPAC Project

Classification

Weakness

CWE-285 Improper Authorization
CWE-862 Missing Authorization

References

us-cert.gov /ics/advisories/icsa-20-135-01
third-party-advisory, us-government-resource

Sources

CVE List CVE-2020-10620
NVD CVE-2020-10620

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