CVE-2021-42110

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-12-08 · updated 2026-06-17

Description

An issue was discovered in Allegro Windows (formerly Popsy Windows) before 3.3.4156.1. A standard user can escalate privileges to SYSTEM if the FTP module is installed, because of DLL hijacking.

Affected products

Allegro: before 3.3.4156.1 — fixed in 3.3.4156.1

How to fix

Upgrade to a fixed version: Allegro 3.3.4156.1. Check the vendor advisory for mitigations.

References

http://www.popsy.com/Documents/Setups/Setup.Allegro.3.3.4154.2.exe
https://cds.thalesgroup.com/en/tcs-cert/CVE-2021-42110
https://excellium-services.com/cert-xlm-advisory/CVE-2021-42110
http://www.popsy.com/Documents/Setups/Setup.Allegro.3.3.4154.2.exe
https://excellium-services.com/cert-xlm-advisory/CVE-2021-42110

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