CVE-2021-47771Public exploit

Persistent client crash via unbounded connection fields

Published Jan 15, 2026 · Updated Jan 15, 2026

Denial of service in Cinspiration RDP-Manager 4.9.9.3 allows local users to persistently crash the Windows client through connection fields. The Verbindungsname and Server fields accept oversized values without length limits and persist malformed entries in sqLitedatabase.db3. Local system access is required to save or import an entry; once retained, it causes the client to crash again after restart.

CVSS severity6.8
Medium
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Cinspiration RDP-Manager 4.9.9.3 allows local users to persistently crash the Windows client through connection fields. The Verbindungsname and Server fields accept oversized values without length limits and persist malformed entries in sqLitedatabase.db3. Local system access is required to save or import an entry; once retained, it causes the client to crash again after restart.

The record

CVE
CVE-2021-47771
Published
Jan 15, 2026
Updated
Jan 15, 2026
Vendor
Cinspiration
Product
RDP-Manager
Classifications
CWE-770, T1499
Attack vector
local
Privileges
authenticated

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=4.9.9.3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Cinspiration · RDP-Managerversion=4.9.9.3

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5VulnCheckCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.8VulnCheckCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499Endpoint Denial of Service

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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