CVE-2020-10551Public exploit

SYSTEM privilege escalation via writable service executable

Published Apr 9, 2020 · Updated Aug 4, 2024

Improper access control in Tencent QQBrowser before 10.5.3870.400 allows local users to execute code as NT AUTHORITY\SYSTEM. The installer assigns TsService.exe an ACL that lets NT AUTHORITY\Authenticated Users replace the executable launched by the TxQBService Windows service. Any authenticated Windows account can substitute a malicious binary, and the payload runs with SYSTEM privileges when the service starts after a reboot.

CVSS severity7.8
High
EPSS probability1.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in Tencent QQBrowser before 10.5.3870.400 allows local users to execute code as NT AUTHORITY\SYSTEM. The installer assigns TsService.exe an ACL that lets NT AUTHORITY\Authenticated Users replace the executable launched by the TxQBService Windows service. Any authenticated Windows account can substitute a malicious binary, and the payload runs with SYSTEM privileges when the service starts after a reboot.

The record

CVE
CVE-2020-10551
Published
Apr 9, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-732, T1574.010
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 9, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record 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

7.2NIST NVDAV:L/AC:L/Au:N/C:C/I:C/A:C
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/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.

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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-732Incorrect Permission Assignment for Critical Resource
T1574.010Hijack Execution Flow: Services File Permissions Weakness

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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