What is CVE-2023-40706?

CVE-2023-40706 is a high-severity vulnerability in Opto 22 Snap Pac S1, classified under Improper Restriction of Excessive Authentication Attempts. CVSS score: 8.6/10. Published 2023-08-24.

How severe is CVE-2023-40706?

High severity. CVSS v3 base score is 8.6 out of 10.

Vulnerability in Opto 22 Snap Pac S1

CVE-2023-40706

There is no limit on the number of login attempts in the web server for the SNAP PAC S1 Firmware version R10.3b. This could allow for a brute-force attack on the built-in web server login.

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

CVSS v3 metric

CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.007 (50.0th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 50.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · 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-307 — Improper Restriction of Excessive Authentication Attempts

References

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

Frequently asked questions

What is CVE-2023-40706?: CVE-2023-40706 is a high-severity vulnerability in Opto 22 Snap Pac S1, classified under Improper Restriction of Excessive Authentication Attempts. CVSS score: 8.6/10. Published 2023-08-24.
How severe is CVE-2023-40706?: High severity. CVSS v3 base score is 8.6 out of 10.