What is CVE-2020-37203?

CVE-2020-37203 is a high-severity vulnerability in Nsasoft Nsauditor Office Product Key Finder, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.5/10. Published 2026-02-11.

How severe is CVE-2020-37203?

High severity. CVSS v3 base score is 7.5 out of 10.

Buffer overflow in Nsasoft Nsauditor Office Product Key Finder

CVE-2020-37203

Office Product Key Finder 1.5.4 contains a denial of service vulnerability that allows attackers to crash the application by manipulating the registration code input. Attackers can create a specially crafted text file and paste it into the 'Name and Key' field to trigger an application crash.

Vulnerability class: Buffer Overflow

Published 2026-02-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.003 (25.7th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 26th percentile — 25.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000

Affected products

Nsasoft Nsauditor Office Product Key Finder — versions 1.5.4

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

www.exploit-db.com/exploits/47867 (exploit)
www.nsauditor.com/ (product)
www.vulncheck.com/advisories/office-product-key-finder-denial-of-service (third-party-advisory)

Frequently asked questions

What is CVE-2020-37203?: CVE-2020-37203 is a high-severity vulnerability in Nsasoft Nsauditor Office Product Key Finder, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.5/10. Published 2026-02-11.
How severe is CVE-2020-37203?: High severity. CVSS v3 base score is 7.5 out of 10.