Improper Access Control in OPTO 22 SNAP PAC S1

published 2023-08-24 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-45263

cvss: 5.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.5%; EPSS 0.5% chance of exploitation in 30 days, percentile 41%
public exploits: 0; none known

The File Transfer Protocol (FTP) port is open by default in the SNAP PAC S1 Firmware version R10.3b. This could allow an adversary to access some device files.

Vendor advisories

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

cisa ICSA-23-236-02 updated 2023-08-24 cvss 5.3

OPTO 22 SNAP PAC S1

OPTO 22 SNAP PAC S1 Firmware R10.3b
affected: mitigation “OPTO 22 recommends users follow the direction Dragos and CISA provided for this vulnerability.”

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: partial
Assessed: 2 y ago (2024-10-02)

Exploit prediction

0.48% chance of exploitation in the next 30 days, higher than 41% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	5.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N
NVD	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected products

OPTO 22 SNAP PAC S1
opto22 snap_pac_s1

Classification

Weakness

CWE-1188 Initialization of a Resource with an Insecure Default

References

cisa.gov /news-events/ics-advisories/icsa-23-236-02
third-party-advisory, us-government-resource

Sources

CVE List CVE-2023-40708
NVD CVE-2023-40708

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Summary