CVE-2020-24574

Name: CVE-2020-24574
Creator: NVD / NIST
Published: 2020-08-21T04:15:10.787+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 0.62%

Last modified Jun 17, 2026

CVE-2020-24574 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. The client (aka GalaxyClientService.exe) in GOG GALAXY through 2.0.41 (as of 12:58 AM Eastern, 9/26/21) allows local privilege escalation from any authenticated user to SYSTEM by instructing the Windows service to execute arbitrary commands. This occurs because the attacker can inject a DLL into GalaxyClient.exe, defeating the TCP-based "trusted client" protection mechanism.. EPSS estimates a 0.62% chance of exploitation in the next 30 days.

Description

The client (aka GalaxyClientService.exe) in GOG GALAXY through 2.0.41 (as of 12:58 AM Eastern, 9/26/21) allows local privilege escalation from any authenticated user to SYSTEM by instructing the Windows service to execute arbitrary commands. This occurs because the attacker can inject a DLL into GalaxyClient.exe, defeating the TCP-based "trusted client" protection mechanism.

Metrics

CVSS 3.1

7.8/10

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS Probability

0.62%

45.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-798

Affected Software

Vendor	Product	Versions
Gog	Galaxy	>= 2.0.13, <= 2.0.41

References

https://github.com/jtesta/gog_galaxy_client_service_pocExploit, Third Party Advisory
https://github.com/jtesta/gog_galaxy_client_service_poc/issues/1#issuecomment-926932218Issue Tracking, Third Party Advisory
https://www.gog.com/galaxyVendor Advisory
https://www.positronsecurity.com/blog/2020-08-13-gog-galaxy_client-local-privilege-escalation_deuce/Exploit, Third Party Advisory
https://github.com/jtesta/gog_galaxy_client_service_pocExploit, Third Party Advisory
https://github.com/jtesta/gog_galaxy_client_service_poc/issues/1#issuecomment-926932218Issue Tracking, Third Party Advisory
https://www.gog.com/galaxyVendor Advisory
https://www.positronsecurity.com/blog/2020-08-13-gog-galaxy_client-local-privilege-escalation_deuce/Exploit, Third Party Advisory

Timeline

Published: Aug 21, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-24574?

How severe is CVE-2020-24574?

CVE-2020-24574 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.62% probability of exploitation in the next 30 days.

How do I fix CVE-2020-24574?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-24574?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST