TI-2023-21491 Aliases CVE-2023-40706 GHSA-245g-9f78-5jxc

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

MEDIUM 49CWE-307Published 2023-08-24 · Updated 2024-10-02

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Security bypass
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-307.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.0067 52nd 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: Yes
Technical impact: Partial

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

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
OPTO 22	SNAP PAC S1	R10.3b	—	No fix listed	CNA

SNAP PAC S1 VendorOPTO 22 Affected R10.3b Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPE	Versions	Role	Vendor
cpe:2.3:o:opto22:snap_pac_s1_firmware:r10.3b:::::::*	r10.3b	Vulnerable	OPTO 22
cpe:2.3:h:opto22:snap_pac_s1:-:::::::*	not specified by NVD	Running on	OPTO 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

2026-10-02 Threatist record created from CVE-2023-40706
2026-10-03 Alias added: GHSA-245g-9f78-5jxc

References

Advisory 1

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

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-2023-21495 Resource allocation without limits in OPTO 22 SNAP PAC S1 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