# CVE-2023-41265: Qlik Sense - HTTP Request Tunneling

> Live exploitation tracking for CVE-2023-41265 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-2023-41265

## Key facts

- **Exploitation phase:** Limited Exploitation. The vulnerability is known but shows very limited attacker interest or exploitation activity.
- **CVSS score:** 9.6
- **Public exploit available:** Yes
- **Affected products:** Qlik Sense Enterprise
- **Weaknesses:** CWE-444 (Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling'))
- **Tags:** enterprise_software, windows

## Description

An HTTP Request Tunneling vulnerability found in Qlik Sense Enterprise for Windows for versions May 2023 Patch 3 and earlier, February 2023 Patch 7 and earlier, November 2022 Patch 10 and earlier, and August 2022 Patch 12 and earlier allows a remote attacker to elevate their privilege by tunneling HTTP requests in the raw HTTP request. This allows them to send requests that get executed by the backend server hosting the repository application. This is fixed in August 2023 IR, May 2023 Patch 4, February 2023 Patch 8, November 2022 Patch 11, and August 2022 Patch 13.

## CrowdSec analysis

[CVE-2023-41265](https://euvd.enisa.europa.eu/vulnerability/CVE-2023-41265) is a critical vulnerability in Qlik Sense Enterprise for Windows that allows remote attackers to elevate privileges by tunneling HTTP requests through crafted requests, which are then processed by the backend server.

CrowdSec has been tracking this vulnerability and its exploits since 24th of July 2024.

According to CrowdSec data, while opportunistic exploitation dominates, a portion of threat actors trying to exploit CVE-2023-41265 apply basic targeting methods such as port or service detection. This indicates emerging patterns of selective targeting.
Additionally, according to week-over-week analysis by CrowdSec, exploitation of CVE-2023-41265 is surging. Attack volumes are spiking well above historical norms, indicating widespread and escalating interest from threat actors. CVE-2023-41265 is currently experiencing high visibility and active exploitation across the internet.

Observed exploitation attempts involve requests to URLs containing `/resources/qmc/fonts/../`.

## Timeline

- 2023-08-29: CVE Published. CVE-2023-41265 is published to NVD.
- 2023-12-07: CISA KEV. CVE-2023-41265 is added to the Known Exploited Vulnerabilities catalog by CISA.
- 2023-12-28: CISA Remediation Deadline. Expiration of the CISA remediation deadline as described in [BOD 22-01](https://www.cisa.gov/news-events/directives/bod-22-01-reducing-significant-risk-known-exploited-vulnerabilities).
- 2024-07-24: Rule Released. CrowdSec releases a rule to detect CVE-2023-41265 exploitation attempts against the CrowdSec Network.
- 2024-11-23: CrowdSec First Seen. CrowdSec observes in-the-wild exploitation of CVE-2023-41265 for the first time.

## References

- https://community.qlik.com/t5/Release-Notes/tkb-p/ReleaseNotes
- https://community.qlik.com/t5/Official-Support-Articles/Critical-Security-fixes-for-Qlik-Sense-Enterprise-for-Windows/ta-p/2110801
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2023/CVE-2023-41265.yaml

## Live exploitation data

The [Live Exploit Tracker page](https://tracker.crowdsec.net/cves/CVE-2023-41265) follows observed exploitation activity for CVE-2023-41265. [Request an API key](https://tracker.crowdsec.net/request-api-key) for full access to its exploitation timeline, attacking IP addresses and blocklists.