CVE-2025-66835Public exploit

Local code execution via PATH-resolved wfapi.dll

Published Dec 30, 2025 · Updated Dec 30, 2025

DLL hijacking in TrueConf Client 8.5.2 allows local users to execute arbitrary code by planting a crafted wfapi.dll on Windows. TrueConf.exe requests wfapi.dll without an absolute path, so Windows searches the user PATH and loads an attacker-controlled copy from a writable directory. A low-privileged local user must place the DLL in a PATH directory such as WindowsApps and wait for the client to start; execution remains in the current user's context.

CVSS severity7.1
High
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

DLL hijacking in TrueConf Client 8.5.2 allows local users to execute arbitrary code by planting a crafted wfapi.dll on Windows. TrueConf.exe requests wfapi.dll without an absolute path, so Windows searches the user PATH and loads an attacker-controlled copy from a writable directory. A low-privileged local user must place the DLL in a PATH directory such as WindowsApps and wait for the client to start; execution remains in the current user's context.

The record

CVE
CVE-2025-66835
Published
Dec 30, 2025
Updated
Dec 30, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-427, T1574.001
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 30, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 30, 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 vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.1CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-427Uncontrolled Search Path Element
T1574.001DLL Search Order Hijacking

Public exploit references

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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