What is CVE-2021-43978?

CVE-2021-43978 is a high-severity vulnerability in Allegro, classified under Insufficiently Protected Credentials. CVSS score: 7.1/10. Published 2021-12-08.

How severe is CVE-2021-43978?

High severity. CVSS v3 base score is 7.1 out of 10.

Vulnerability in Allegro

CVE-2021-43978

Allegro WIndows 3.3.4152.0, embeds software administrator database credentials into its binary files, which allows users to access and modify data using the same credentials.

Published 2021-12-08 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N.

EPSS exploit prediction

EPSS: 0.007 (52.9th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 52.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Allegro — versions 3.3.4152.0

Weakness classification (CWE)

CWE-522 — Insufficiently Protected Credentials

References

www.allegro.be/ (Vendor Advisory)
excellium-services.com/cert-xlm-advisory/CVE-2021-43978 (Patch, Third Party Advisory)
cds.thalesgroup.com/en/tcs-cert/CVE-2021-43978

Frequently asked questions

What is CVE-2021-43978?: CVE-2021-43978 is a high-severity vulnerability in Allegro, classified under Insufficiently Protected Credentials. CVSS score: 7.1/10. Published 2021-12-08.
How severe is CVE-2021-43978?: High severity. CVSS v3 base score is 7.1 out of 10.