# CVE-2025-56231: Tonec Internet Download Manager missing SSL certificate validation

Source: https://junglewise.ai/threats/cve-2025-56231-tonec-internet-download-manager-missing-ssl-certificate  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2025-11-05. Updated: 2026-07-05  
License: CC BY 4.0 with a link back

CVE-2025-56231 · Severity: critical · CVSS 9.1 · Published 2025-11-05

Tonec Internet Download Manager, a popular tool for managing and accelerating file downloads, contains a security flaw in how it verifies software updates. Because the application fails to properly validate security certificates, an attacker could intercept the update process and trick the software into installing malicious files instead of legitimate updates. This could lead to a full system compromise or the installation of malware on the user's computer.

Technologies: [Tonec Internet Download Manager](https://junglewise.ai/threats/technologies/internet-download-manager). Vendors: [Tonec](https://junglewise.ai/threats/vendors/tonec).

## Quick answers

**Is CVE-2025-56231 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-56231 being exploited in the wild.

**How severe is CVE-2025-56231?** Critical severity, with a CVSS score of 9.1, published 5 November 2025.

**Which products and versions are affected?** Tonec Internet Download Manager Up to and including 6.42.41.1.

**Is there a fix for CVE-2025-56231?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2025-56231 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2025-56231?** Check whether you run Tonec Internet Download Manager at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

Internet Download Manager (IDM) versions 6.42.41.1 and earlier fail to perform proper SSL/TLS certificate validation (CWE-295) during the update check and retrieval process. A remote attacker positioned on the network (e.g., via Man-in-the-Middle) can intercept the communication between the client and the update server. By presenting a forged certificate that the application fails to reject, the attacker can bypass update protections and deliver malicious payloads disguised as legitimate software updates. This vulnerability is exploitable without authentication and requires no user interaction beyond the application's standard update routine.

## Affected products

- Tonec Internet Download Manager Up to and including 6.42.41.1

## Timeline

- 2025-11-05: disclosed
- 2025-11-05: advisory

## References

- [https://www.notion.so/CVE-2025-56231-2a04e9f2a40d80b184f4d02be58d3600](https://www.notion.so/CVE-2025-56231-2a04e9f2a40d80b184f4d02be58d3600)

## Related threats

- [Tonec Internet Download Manager privilege escalation in idmwfp.sys kernel driver](https://junglewise.ai/threats/cve-2026-90493-tonec-internet-download-manager-privilege-escalation-in-idmwfp)
- [Internet Download Manager buffer overflow in Scheduler](https://junglewise.ai/threats/cve-2020-37234-internet-download-manager-buffer-overflow-in-scheduler)