CVE-2025-63945Public exploit

Local privilege escalation via SYSTEM symlink deletion

Published Feb 23, 2026 · Updated Feb 23, 2026

Privilege escalation in Tencent iOA before 210.9.28693.62001 on Windows allows local users to execute programs with elevated privileges. The SYSTEM-level LegacyKB_ioa_win.exe process deletes tilde-prefixed directories inside the user-modifiable C:\Windows\Temp\TencentDownload path without resolving reparse targets. A local user must win an OpLock race and replace the directory with a junction and symbolic link, turning privileged cleanup into arbitrary file or folder deletion and elevated code execution.

CVSS severity7.4
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

Privilege escalation in Tencent iOA before 210.9.28693.62001 on Windows allows local users to execute programs with elevated privileges. The SYSTEM-level LegacyKB_ioa_win.exe process deletes tilde-prefixed directories inside the user-modifiable C:\Windows\Temp\TencentDownload path without resolving reparse targets. A local user must win an OpLock race and replace the directory with a junction and symbolic link, turning privileged cleanup into arbitrary file or folder deletion and elevated code execution.

The record

CVE
CVE-2025-63945
Published
Feb 23, 2026
Updated
Feb 23, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-59, T1068
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Feb 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 23, 2026Record 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 privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.4CISA-ADPCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-59Improper Link Resolution Before File Access ('Link Following')
T1068Exploitation for Privilege Escalation

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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