Public proof of conceptFix available

CVE-2020-10551

Q: Is CVE-2020-10551 actively exploited?

Active exploitation of CVE-2020-10551 has not been confirmed. Its EPSS score was 1.4% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2020-10551?

CVE-2020-10551 has a CVSS v3 base score of 7.8 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

A public proof of concept exists; no exploitation attested.

Published2020-04-09
Fixed in10.5.3870.400
WeaknessCWE-732

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

QQBrowser before 10.5.3870.400 installs a Windows service TsService.exe. This file is writable by anyone belonging to the NT AUTHORITY\Authenticated Users group, which includes all local and remote users. This can be abused by local attackers to escalate privileges to NT AUTHORITY\SYSTEM by writing a malicious executable to the location of TsService.

Timeline

dates in UTC

2020-04-0913:15CVE publishedNVD
2026-10-2319:23First public proof of conceptPoC-in-GitHub

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-10551?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-10551?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Tencent qqbrowser

Branch	Affected	Fixed in	Source
10.5	< 10.5.3870.400	10.5.3870.400	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update Tencent qqbrowser to 10.5.3870.400

Detection

read 2026-10-23 19:23 UTC

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: 1 repository, unverifiedseqred-s-a/CVE-2020-10551

Sources

NVDCVSS 3.17.8read 2026-10-23
NVDCVSS 2.07.2read 2026-10-23
NVDweakness (CWE)CWE-732read 2026-10-23
FIRST EPSSEPSS score1.4 %2026-10-22
PoC-in-GitHubproof of concept1read 2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published: 2020-04-09
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2020-10551?

Is CVE-2020-10551 actively exploited?

Active exploitation of CVE-2020-10551 has not been confirmed. Its EPSS score was 1.4% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-10551?

CVE-2020-10551 has a CVSS v3 base score of 7.8 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

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