CVE-2020-27383Public exploit

Authenticated executable replacement for privilege escalation

Published Jun 9, 2021 · Updated Aug 4, 2024

Improper permission handling in Blizzard Battle.Net 1.27.1.12428 allows local users to gain elevated privileges via Battle.net.exe. The executable grants the Authenticated Users group full control, allowing replacement of the launcher binary with attacker-chosen code. An authenticated local account must write the executable before it runs; successful replacement can execute code with the launcher's higher privileges.

CVSS severity7.8
High
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper permission handling in Blizzard Battle.Net 1.27.1.12428 allows local users to gain elevated privileges via Battle.net.exe. The executable grants the Authenticated Users group full control, allowing replacement of the launcher binary with attacker-chosen code. An authenticated local account must write the executable before it runs; successful replacement can execute code with the launcher's higher privileges.

The record

CVE
CVE-2020-27383
Published
Jun 9, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-281, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 9, 2021CVE 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

7.8NVDCVSS: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-281Improper Preservation of Permissions
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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