CVE-2023-40706: Improper Restriction of Excessive Authentication Attempts in OPTO 22 SNAP PAC S1 Built-in Web Server

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-08-24 · updated 2026-06-17
Weakness: CWE-307

Description

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.

Affected products

OPTO 22 SNAP PAC S1: r10.3b

References

https://www.cisa.gov/news-events/ics-advisories/icsa-23-236-02
https://www.cisa.gov/news-events/ics-advisories/icsa-23-236-02

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