CVE-2022-43931Network attack vector

Unauthenticated command execution via out-of-bounds write

Published Jan 3, 2023 · Updated Apr 10, 2025

An out-of-bounds write in Synology VPN Plus Server before 1.4.3-0534 and 1.4.4-0635 allows remote attackers to execute arbitrary commands. The flaw is in Remote Desktop functionality, but Synology has not disclosed the affected code path, input, or erroneous write operation. No privileges or user interaction are required; successful exploitation crosses a security boundary and grants control of command execution.

CVSS severity10.0
Critical
EPSS probability16.84%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

An out-of-bounds write in Synology VPN Plus Server before 1.4.3-0534 and 1.4.4-0635 allows remote attackers to execute arbitrary commands. The flaw is in Remote Desktop functionality, but Synology has not disclosed the affected code path, input, or erroneous write operation. No privileges or user interaction are required; successful exploitation crosses a security boundary and grants control of command execution.

The record

CVE
CVE-2022-43931
Published
Jan 3, 2023
Updated
Apr 10, 2025
Vendor
Synology
Product
VPN Plus Server
Classifications
T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 3, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 10, 2025Record 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=* <1.4.3-0534
  2. Affected versionversion=* <1.4.4-0635

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Synology · VPN Plus Serverversion=* <1.4.3-0534; version=* <1.4.4-0635

Published CVSS scores

10.0Synology Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/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.

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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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