CVE-2021-42110

HIGHNVD 7.17.8▲

7.1

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.

CVSS v3: 7.1
EG Score: 7.8(medium)
EPSS: 17.5%
KEV: Not listed

Published

December 8, 2021

Last Modified

May 30, 2025

References (5)

cve@mitrehttp://www.popsy.com/Documents/Setups/Setup.Allegro.3.3.4154.2.exe
cve@mitrehttps://cds.thalesgroup.com/en/tcs-cert/CVE-2021-42110
cve@mitrehttps://excellium-services.com/cert-xlm-advisory/CVE-2021-42110
af854a3a-2127-422b-91ae-364da2661108http://www.popsy.com/Documents/Setups/Setup.Allegro.3.3.4154.2.exe
af854a3a-2127-422b-91ae-364da2661108https://excellium-services.com/cert-xlm-advisory/CVE-2021-42110

Data Freshness Timeline

(refreshed 11× in last 7d / 20× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

2026-06-08 14:15 UTCEPSS rescore
2026-06-08 14:15 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-05 22:45 UTCEPSS rescore
2026-06-05 06:09 UTCEPSS rescore
2026-06-05 06:09 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-01 13:50 UTCEPSS rescore
2026-06-01 13:50 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 00:15 UTCEPSS rescore
2026-05-31 00:15 UTCEPSS rescore
2026-05-29 13:42 UTCEPSS rescore

Frequently asked(5)

What is CVE-2021-42110?

CVE-2021-42110 is a high vulnerability published on December 8, 2021. 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.

When was CVE-2021-42110 disclosed?

CVE-2021-42110 was first published in the National Vulnerability Database on December 8, 2021, with the most recent update on May 30, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-42110 actively exploited?

CVE-2021-42110 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 17.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-42110?

CVE-2021-42110 has a CVSS v3 base score of 7.1 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 7.8.

How do I remediate CVE-2021-42110?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-42110, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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CVE-2021-42110

📅 Published

🔄 Last Modified

🔗 References (5)