# CVE-2021-41419: NVR DVR - RCE

> Live exploitation tracking for CVE-2021-41419 by the CrowdSec Live Exploit Tracker, built from real-world attack data crowdsourced from CrowdSec's global network.

Page: https://tracker.crowdsec.net/cves/CVE-2021-41419

## Key facts

- **Exploitation phase:** Limited Exploitation. The vulnerability is known but shows very limited attacker interest or exploitation activity.
- **CVSS score:** 9.8
- **Public exploit available:** Yes
- **Affected products:** QVIS NVR DVR
- **Weaknesses:** CWE-502 (Deserialization of Untrusted Data)
- **Tags:** iot

## Description

QVIS NVR DVR before 2021-12-13 is vulnerable to Remote Code Execution via Java deserialization.

## CrowdSec analysis

[CVE-2021-41419](https://euvd.enisa.europa.eu/vulnerability/CVE-2021-41419) is a critical remote code execution vulnerability in QVIS NVR DVR devices prior to 2021-12-13, stemming from insecure Java deserialization. Attackers can exploit this flaw remotely to execute arbitrary code, potentially taking full control of affected systems and compromising confidentiality, integrity, and availability.

CrowdSec has been tracking this vulnerability and its exploits since 26th of November 2025.

CrowdSec has not observed any significant exploitation activity targeting CVE-2021-41419 across its network. As a result, no community-driven trend analysis is available for this vulnerability at this time.

Attackers exploit this vulnerability by sending crafted requests to endpoints under `/qvisdvr/`, specifically targeting `/qvisdvr/index.faces` with malicious Java deserialization payloads in the `javax.faces.ViewState` parameter to achieve remote code execution.

## Timeline

- 2022-07-17: CVE Published. CVE-2021-41419 is published to NVD.
- 2025-11-26: Rule Released. CrowdSec releases a rule to detect CVE-2021-41419 exploitation attempts against the CrowdSec Network.
- 2026-02-01: CrowdSec First Seen. CrowdSec observes in-the-wild exploitation of CVE-2021-41419 for the first time.

## References

- https://gist.github.com/Meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee/712ac36c8a08e2698e875169442a23a4
- https://github.com/projectdiscovery/nuclei-templates/blob/master/iot/qvisdvr-deserialization-rce.yaml
- https://twitter.com/Me9187/status/1414904314368348163
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-41419.yaml

## Live exploitation data

The [Live Exploit Tracker page](https://tracker.crowdsec.net/cves/CVE-2021-41419) follows observed exploitation activity for CVE-2021-41419. [Request an API key](https://tracker.crowdsec.net/request-api-key) for full access to its exploitation timeline, attacking IP addresses and blocklists.