How severe is CVE-2023-40707?

CVE-2023-40707 has a CVSS 3.x base score of 8.6, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2023-40707 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-40707?

CVE-2023-40707 affects Opto22 Snap Pac S1 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-40707?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2023-40707 published?

CVE-2023-40707 was published on 2023-08-24 and last updated on 2026-06-17.

CVE-2023-40707

CVE-2023-40707 is a high-severity vulnerability in Opto22 Snap Pac S1 Firmware with a CVSS 3.x base score of 8.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-521.

Key facts

Severity: High (CVSS 3.x base score 8.6)
EPSS exploit prediction: 0% (37th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-521
Affected product: Opto22 Snap Pac S1 Firmware
Published: 2023-08-24
Last modified: 2026-06-17

Description

There are no requirements for setting a complex password in the built-in web server of the SNAP PAC S1 Firmware version R10.3b, which could allow for a successful brute force attack if users don't set up complex credentials.

Frequently asked questions

What is CVE-2023-40707?: There are no requirements for setting a complex password in the built-in web server of the SNAP PAC S1 Firmware version R10.3b, which could allow for a successful brute force attack if users don't set up complex credentials.
How severe is CVE-2023-40707?: CVE-2023-40707 has a CVSS 3.x base score of 8.6, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2023-40707 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-40707?: CVE-2023-40707 affects Opto22 Snap Pac S1 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-40707?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2023-40707 published?: CVE-2023-40707 was published on 2023-08-24 and last updated on 2026-06-17.

References

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

Affected products (1)

cpe:2.3:o:opto22:snap_pac_s1_firmware:r10.3b:*:*:*:*:*:*:*

More vulnerabilities in Opto22 Snap Pac S1 Firmware

CVE-2023-40706 — High (CVSS 8.6): There is no limit on the number of login attempts in the web server for the SNAP PAC S1 Firmware version R10.3b. This…
CVE-2023-40710 — Medium (CVSS 6.8): An adversary could cause a continuous restart loop to the entire device by sending a large quantity of HTTP GET…
CVE-2023-40709 — Medium (CVSS 6.8): An adversary could crash the entire device by sending a large quantity of ICMP requests if the controller has the…
CVE-2023-40708 — Medium (CVSS 5.8): The File Transfer Protocol (FTP) port is open by default in the SNAP PAC S1 Firmware version R10.3b. This could allow…

All CVEs affecting Opto22 Snap Pac S1 Firmware →

Other CWE-521 (Weak Password Requirements) vulnerabilities

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CVE-2025-63747 — Critical (CVSS 9.8): QaTraq 6.9.2 ships with administrative account credentials which are enabled in default installations and permit…
CVE-2025-12552 — Critical (CVSS 9.8): Insufficient Password Policy.This issue affects BLU-IC2: through 1.19.5; BLU-IC4: through 1.19.5.
CVE-2025-11200 — Critical (CVSS 9.8): MLflow Weak Password Requirements Authentication Bypass Vulnerability. This vulnerability allows remote attackers to…
CVE-2025-12364 — Critical (CVSS 9.8): Weak Password Policy.This issue affects BLU-IC2: through 1.19.5; BLU-IC4: through 1.19.5.

Browse all CWE-521 (Weak Password Requirements) vulnerabilities →