# CVE-2021-41714: Tipask - Arbitrary File Download

> Live exploitation tracking for CVE-2021-41714 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-2021-41714

## Key facts

- **Exploitation phase:** Background Noise. Continuous low-level scanning or exploitation attempts are observed, mostly opportunistic and automated.
- **CVSS score:** 7.7
- **Public exploit available:** Yes
- **Affected products:** Tipask
- **Weaknesses:** CWE-494 (Download of Code Without Integrity Check)
- **Tags:** web_application

## Description

In Tipask < 3.5.9, path parameters entered by the user are not validated when downloading attachments, a registered user can download arbitrary files on the Tipask server such as .env, /etc/passwd, laravel.log, causing infomation leakage.

## CrowdSec analysis

[CVE-2021-41714](https://euvd.enisa.europa.eu/vulnerability/CVE-2021-41714) is a vulnerability in Tipask that allow any registered user to download arbitrary files from the server due to a missing path validation when downloading attachment. This flaw could be exploited to steal files until patched in versions 3.5.9.

CrowdSec has been tracking this vulnerability and its exploits since 22nd of December 2023.

CrowdSec network data shows that most actors exploiting CVE-2021-41714 rely on broad, untargeted scans with minimal filtering. The activity is largely automated and opportunistic in nature.
Additionally, according to week-over-week analysis by CrowdSec, exploitation of CVE-2021-41714 is surging. Attack volumes are spiking well above historical norms, indicating widespread and escalating interest from threat actors. CVE-2021-41714 is currently experiencing high visibility and active exploitation across the internet.

This vulnerability is exploited by making crafted requests to the `/attach/download/` endpoint, such as `/attach/download/..-..-..-..-..-etc-passwd`.

## Timeline

- 2022-05-23: CVE Published. CVE-2021-41714 is published to NVD.
- 2023-12-22: Rule Released. CrowdSec releases a rule to detect CVE-2021-41714 exploitation attempts against the CrowdSec Network.
- 2025-09-19: CrowdSec First Seen. CrowdSec observes in-the-wild exploitation of CVE-2021-41714 for the first time.

## References

- https://www.yuque.com/henry-weply/penetration/fza5hm
- https://github.com/sdfsky/tipask/blob/c4e6aa9f6017c9664780570016954c0922d203b7/app/Http/Controllers/AttachController.php#L42
- https://github.com/sdfsky/tipask/commit/9b5f13d1708e9a5dc0959cb8a97be1c32b94ca69

## Live exploitation data

The [Live Exploit Tracker page](https://tracker.crowdsec.net/cves/CVE-2021-41714) follows observed exploitation activity for CVE-2021-41714. [Request an API key](https://tracker.crowdsec.net/request-api-key) for full access to its exploitation timeline, attacking IP addresses and blocklists.