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CVE-2023-40709

Uncontrolled Resource Consumption in OPTO 22 SNAP PAC S1 Built-In Web Server

HIGH

7.5

CVSS Score

Published: August 24, 2023 at 04:08 PM UTC

Updated: June 17, 2026 at 06:19 AM UTC

2 products affected across 1 vendorSnap Pac S1 FirmwareSnap Pac S1

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Severity

HIGH7.5

Exploit prediction

EPSS 0.6%

SSVC

No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Snap Pac S1 Firmware · OPTO22

95%

R10.3br10.3b

Snap Pac S1 · OPTO22device

80%

All versions

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

Third Party AdvisoryUS Government Resource

Source: [email protected]

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

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGH[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: NONE
Availability: HIGH

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-770CWE-400

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