CVE-2020-37203Public exploit

Application crash via unchecked registration input

Published Feb 11, 2026 · Updated Feb 11, 2026

Buffer overflow in Nsasoft Office Product Key Finder 1.5.4 allows local users to crash the application through registration input. The Name and Key registration field copies an oversized text payload without checking that it fits the destination buffer. Exploitation requires a user to paste the crafted file's contents into that field and submit the check; the demonstrated consequence is an application crash, with no reported code execution or data impact.

CVSS severity7.5
High
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in Nsasoft Office Product Key Finder 1.5.4 allows local users to crash the application through registration input. The Name and Key registration field copies an oversized text payload without checking that it fits the destination buffer. Exploitation requires a user to paste the crafted file's contents into that field and submit the check; the demonstrated consequence is an application crash, with no reported code execution or data impact.

The record

CVE
CVE-2020-37203
Published
Feb 11, 2026
Updated
Feb 11, 2026
Vendor
Nsasoft
Product
Office Product Key Finder
Classifications
CWE-120, T1204
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.5.4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Nsasoft · Office Product Key Finderversion=1.5.4

Published CVSS scores

4.6VulnCheck CNACVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
7.5VulnCheck CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1204User Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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