Security readout for executives and security teams
Plain-English summary
CVE-2020-27383 is a local privilege risk in Battle.Net 1.27.1.12428. The public record says authenticated Windows users could have full control over Battle.net.exe, allowing replacement of the executable. Business impact depends on where the launcher is installed and who later runs it.
Executive priority
Treat this as a targeted endpoint hygiene issue, not an internet-facing emergency. Prioritize shared Windows systems, privileged admin workstations, and gaming-enabled corporate endpoints where local users should not be able to alter installed executables.
Technical view
The CVE describes weak file permissions on Battle.net.exe: the Authenticated Users group was granted Full Control. That could permit a local authenticated user to modify or replace the executable. No CVSS score, CWE, vendor advisory, or fixed version is provided in the supplied sources.
Likely exposure
Exposure is likely limited to endpoints with Battle.Net 1.27.1.12428 installed using the vulnerable executable permissions. Systems without local untrusted users have lower practical risk, but shared workstations and managed fleets need verification.
Exploitation context
The sources do not show active exploitation, and the CVE is not listed as KEV. Exploitation would require authenticated local access and depends on the modified executable later being run in a useful security context.
Researcher notes
Evidence is sparse: the CVE record provides the core permission flaw and one GitHub reference, but no CVSS vector, affected CPEs, patch statement, or exploitation confirmation. Avoid assuming broader Battle.net versions are affected without vendor or package evidence.
Mitigation direction
- Check official Battle.net or Blizzard guidance for fixed versions or installer repairs.
- Update or reinstall affected Battle.Net clients where vendor guidance supports it.
- Ensure Battle.net.exe is not writable by Authenticated Users or standard users.
- Restrict local interactive access on shared or high-value endpoints.
- Monitor endpoint controls for unexpected Battle.net.exe replacement or tampering.
Validation and detection
- Inventory endpoints for Battle.Net 1.27.1.12428 or older installed clients.
- Review Battle.net.exe permissions for Authenticated Users Full Control.
- Confirm standard users cannot modify or replace the executable.
- Check endpoint telemetry for recent Battle.net.exe integrity changes.
- Document whether vendor-fixed versions are deployed across managed systems.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2020-27383 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/FreySolarEye/CVE/blob/master/Battle%20Net%20Launcher%20Local%20Privilege%20EscalationCVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.