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CVE-2023-47674· NVD / CVE Program· CNA jpcert

Missing authentication for critical function vulnerability in First Corporation's DVRs allows a remote unauthenticated attacker to rewrite o

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.

CriticalCVSS 9.8 · v3.1—No exploit No fix recorded

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Published
Nov 16, 2023
Updated
Jun 17, 2026
EPSS
1.3% · 69th percentile
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Report tools

JSON

Action score

39

Monitor

Low priority for now.

CVSS
39 / 40 · 9.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 1.3%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

Affected systems

VendorProduct
c-firstcfr-1004ea firmware
c-firstcfr-1004ea
c-firstcfr-1008ea firmware
c-firstcfr-1008ea
c-firstcfr-1016ea firmware
c-firstcfr-1016ea
c-firstcfr-16eaa firmware
c-firstcfr-16eaa
c-firstcfr-16eab firmware
c-firstcfr-16eab
c-firstcfr-16eha firmware
c-firstcfr-16eha

and 44 more

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • c-first cfr-1004ea firmwareall versions
  • c-first cfr-1008ea firmwareall versions
  • c-first cfr-1016ea firmwareall versions
  • c-first cfr-16eaa firmwareall versions
  • c-first cfr-16eab firmwareall versions
  • c-first cfr-16eha firmwareall versions
  • c-first cfr-16ehd firmwareall versions
  • c-first cfr-4eaa firmwareall versions
  • c-first cfr-4eaam firmwareall versions
  • c-first cfr-4eab firmwareall versions
  • c-first cfr-4eabc firmwareall versions
  • c-first cfr-4eha firmwareall versions
  • c-first cfr-4ehd firmwareall versions
  • c-first cfr-8eaa firmwareall versions
  • c-first cfr-8eab firmwareall versions
  • c-first cfr-8eha firmwareall versions
  • c-first cfr-8ehd firmwareall versions
  • c-first cfr-904e firmwareall versions
  • c-first cfr-908e firmwareall versions
  • c-first cfr-916e firmwareall versions

Versions reported by the vendor

Affected version ranges reported by the assigning authority (jpcert). Independent of NVD's CPE analysis and usually ahead of it.

  • First Co., Ltd. CFR-1004EA, CFR-1008EA, CFR-1016EA

    • firmware all versionsaffected

  • First Co., Ltd. CFR-4EAA, CFR-8EAA, CFR-16EAA

    • firmware all versionsaffected

  • First Co., Ltd. CFR-4EAAM, CFR-4EABC

    • firmware all versionsaffected

  • First Co., Ltd. CFR-4EAB, CFR-8EAB, CFR-16EAB

    • firmware all versionsaffected

  • First Co., Ltd. CFR-4EHA, CFR-8EHA, CFR-16EHA

    • firmware all versionsaffected

  • First Co., Ltd. CFR-4EHD, CFR-8EHD, CFR-16EHD

    • firmware all versionsaffected

  • First Co., Ltd. CFR-904E, CFR-908E, CFR-916E

    • firmware all versionsaffected

  • First Co., Ltd. MD-404AA, MD-808AA

    • firmware all versionsaffected

  • First Co., Ltd. MD-404AB, MD-808AB

    • firmware all versionsaffected

  • First Co., Ltd. MD-404HA, MD-808HA

    • firmware all versionsaffected

  • First Co., Ltd. MD-404HD, MD-808HD

    • firmware all versionsaffected

Same product

c-first: all records

Other highest-scoring records for the same primary product.

  • CVE-2023-47213First Corporation's DVRs use a hard-coded password, which may allow a remote unauthenticated attacker to rewrite or obtain the configuration
    39Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-306 · Missing Authentication for Critical Function

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

nvd-primary

Root cause

A function added for development or support ships to production without authentication. It often relies on the assumption that it is “only reachable from the internal network.”

The bug in code

The whole CWE-306 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

ts
// Added for the support teamapp.post("/maintenance/reset", resetDevice);

Fixed

ts
if (config.maintenanceEnabled) {  app.post(    "/maintenance/reset",    requireSession, requireRole("admin"), resetDevice  );}

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records