CVE-2020-37131Public exploit

Application crash via oversized registration key

Published Feb 5, 2026 · Updated Feb 5, 2026

Classic buffer overflow in Nsasoft Product Key Explorer 4.2.2.0 allows local users to crash the application via a registration key. The Key input path copies a 1,000-byte repeated-character registration value without checking that it fits the destination buffer. The attacker must access the local Windows GUI and paste the crafted value into the Key field; the documented consequence is an application crash only.

CVSS severity6.7
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Classic buffer overflow in Nsasoft Product Key Explorer 4.2.2.0 allows local users to crash the application via a registration key. The Key input path copies a 1,000-byte repeated-character registration value without checking that it fits the destination buffer. The attacker must access the local Windows GUI and paste the crafted value into the Key field; the documented consequence is an application crash only.

The record

CVE
CVE-2020-37131
Published
Feb 5, 2026
Updated
Feb 5, 2026
Vendor
Nsasoft
Product
Product Key Explorer
Classifications
CWE-120
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 5, 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=4.2.2.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Nsasoft · Product Key Explorerversion=4.2.2.0

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
6.7VulnCheckCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
6.2VulnCheckCVSS:3.1/AV:L/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')

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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