CVE-2025-56231Network attack vector

Update-source impersonation via missing certificate validation

Published Nov 5, 2025 · Updated Nov 5, 2025

Improper certificate validation in Tonec Internet Download Manager 6.42.41.1 and earlier allows attackers to bypass update protections. The update mechanism accepts a server certificate without performing the validation needed to authenticate the update source. Man-in-the-middle attackers need no account or user interaction to impersonate that source and intercept or substitute protected update content.

CVSS severity9.1
Critical
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper certificate validation in Tonec Internet Download Manager 6.42.41.1 and earlier allows attackers to bypass update protections. The update mechanism accepts a server certificate without performing the validation needed to authenticate the update source. Man-in-the-middle attackers need no account or user interaction to impersonate that source and intercept or substitute protected update content.

The record

CVE
CVE-2025-56231
Published
Nov 5, 2025
Updated
Nov 5, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-295, T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 5, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 5, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-295Improper Certificate Validation
T1557Adversary-in-the-Middle

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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