CVE-2021-47813Public exploit

Local application crash via oversized registration code

Published Jan 15, 2026 · Updated Jan 15, 2026

Classic buffer overflow in Nsasoft Backup Key Recovery 2.2.7.0 allows local users to crash the application through its registration dialog. The registration-code handler copies a 256-character Key value without enforcing the destination buffer's size. Exploitation requires interactive Windows desktop access, entry of a name, pasting the crafted value into Key, and selecting OK; only a process crash is demonstrated.

CVSS severity6.7
Medium
EPSS probability0.41%
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 Backup Key Recovery 2.2.7.0 allows local users to crash the application through its registration dialog. The registration-code handler copies a 256-character Key value without enforcing the destination buffer's size. Exploitation requires interactive Windows desktop access, entry of a name, pasting the crafted value into Key, and selecting OK; only a process crash is demonstrated.

The record

CVE
CVE-2021-47813
Published
Jan 15, 2026
Updated
Jan 15, 2026
Vendor
Nsasoft
Product
Backup Key Recovery
Classifications
CWE-120
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 15, 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=2.2.7.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Nsasoft · Backup Key Recoveryversion=2.2.7.0

Published CVSS scores

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
7.5VulnCheckCVSS: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')

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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