CVE-2023-40709: Uncontrolled Resource Consumption in OPTO 22 SNAP PAC S1 Built-In Web Server

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% 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-770

Description

An adversary could crash the entire device by sending a large quantity of ICMP requests if the controller has the built-in web server enabled but does not have the built-in web server completely set up and configured for the SNAP PAC S1 Firmware version R10.3b

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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