What is CVE-2023-40708?

CVE-2023-40708 is a medium-severity vulnerability in Opto 22 Snap Pac S1, classified under Initialization of a Resource with an Insecure Default. CVSS score: 5.8/10. Published 2023-08-24.

How severe is CVE-2023-40708?

Medium severity. CVSS v3 base score is 5.8 out of 10.

RCE in Opto 22 Snap Pac S1

CVE-2023-40708

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.

Published 2023-08-24 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.005 (38.8th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 39th percentile — 38.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Opto 22 Snap Pac S1 — versions R10.3b
Opto22 Snap Pac S1
Opto22 Snap Pac S1 Firmware — versions r10.3b

Weakness classification (CWE)

CWE-1188 — Initialization of a Resource with an Insecure Default

References

www.cisa.gov/news-events/ics-advisories/icsa-23-236-02 (US Government Resource, Third Party Advisory)

Frequently asked questions

What is CVE-2023-40708?: CVE-2023-40708 is a medium-severity vulnerability in Opto 22 Snap Pac S1, classified under Initialization of a Resource with an Insecure Default. CVSS score: 5.8/10. Published 2023-08-24.
How severe is CVE-2023-40708?: Medium severity. CVSS v3 base score is 5.8 out of 10.