CVE-2021-47739Public exploit

Local privilege escalation via unquoted service path

Published Dec 23, 2025 · Updated Dec 23, 2025

Unquoted service path handling in Epic Games Easy Anti-Cheat 4.0 allows local users to execute arbitrary code as LocalSystem. The Windows EasyAntiCheat service registers C:\Program Files (x86)\EasyAntiCheat\EasyAntiCheat.exe without quotation marks, allowing Windows path parsing to select attacker-planted code earlier in the path. Exploitation requires a non-privileged local account able to place code in the system root path and trigger application startup or a reboot.

CVSS severity8.5
High
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unquoted service path handling in Epic Games Easy Anti-Cheat 4.0 allows local users to execute arbitrary code as LocalSystem. The Windows EasyAntiCheat service registers C:\Program Files (x86)\EasyAntiCheat\EasyAntiCheat.exe without quotation marks, allowing Windows path parsing to select attacker-planted code earlier in the path. Exploitation requires a non-privileged local account able to place code in the system root path and trigger application startup or a reboot.

The record

CVE
CVE-2021-47739
Published
Dec 23, 2025
Updated
Dec 23, 2025
Vendor
Epic Games
Product
Easy Anti-Cheat
Classifications
CWE-428, T1574.009
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 23, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 23, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Epic Games · Easy Anti-Cheatversion=4.0

Published CVSS scores

8.5VulnCheckCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
8.4VulnCheckCVSS:3.1/AV:L/AC:L/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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-428Unquoted Search Path or Element
T1574.009Path Interception by Unquoted Path

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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