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TI-2023-21495 Aliases CVE-2023-40710GHSA-4cjc-ff35-f4f5

Resource allocation without limits in OPTO 22 SNAP PAC S1

Priority LOW 34CWE-770Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-770.

Summary

An adversary could cause a continuous restart loop to the entire device by sending a large quantity of HTTP GET 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

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00551 46th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
OPTO 22SNAP PAC S1R10.3b—No fix listedCNA
  • SNAP PAC S1 VendorOPTO 22 Affected R10.3b Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:o:opto22:snap_pac_s1_firmware:r10.3b:*:*:*:*:*:*:*r10.3bVulnerableOPTO 22
cpe:2.3:h:opto22:snap_pac_s1:-:*:*:*:*:*:*:*not specified by NVDRunning onOPTO 22
  • cpe:2.3:o:opto22:snap_pac_s1_firmware:r10.3b:*:*:*:*:*:*:* Versions r10.3b Vulnerable ·OPTO 22
  • cpe:2.3:h:opto22:snap_pac_s1:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·OPTO 22

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2023-40710
  2. 2026-10-03 Alias added: GHSA-4cjc-ff35-f4f5

References

Advisory 1

  • TI-2023-21491 Improper Restriction of Excessive Authentication Attempts in OPTO 22 SNAP PAC S1 Built-in Web Server CVSS 3.1CRITICAL 9.8
  • TI-2023-21492 Weak password requirements in OPTO 22 SNAP PAC S1 Built-in Web Server CVSS 3.1HIGH 8.6
  • TI-2023-21494 Uncontrolled Resource Consumption in OPTO 22 SNAP PAC S1 Built-In Web Server CVSS 3.1HIGH 7.5
  • TI-2023-21493 Improper Access Control in OPTO 22 SNAP PAC S1 CVSS 3.1MEDIUM 5.8

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences