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No exploitation reportedFix available

CVE-2023-27395

No exploitation reported by the sources we read.

  • Published2023-10-12
  • WeaknessCWE-122 · CWE-787

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

A heap-based buffer overflow vulnerability exists in the vpnserver WpcParsePacket() functionality of SoftEther VPN 4.41-9782-beta, 5.01.9674 and 5.02. A specially crafted network packet can lead to arbitrary code execution. An attacker can perform a man-in-the-middle attack to trigger this vulnerability.

Timeline

dates in UTC
  1. 2023-10-1216:15CVE publishedNVD

Versions per branch

NVD · CISA-ADP
Softether vpn
BranchAffectedFixed in
4.41= 4.41-9782no fix published
5.1= 5.01.9674no fix published
5.2= 5.02no fix published
Softether vpn
BranchAffectedFixed in
4.41= 4.41-9782-betano fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As talos, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • SoftEther VPN
    Affected
    • = 4.41-9782-betano fix stated
    • = 5.01.9674no fix stated
    • = 5.02no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2023-10-12

Fix

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • CISA-ADPSSVC decisionnone2024-08-01
  • CNACVSS 3.19known since 2026-10-23
  • NVDCVSS 3.18.1read 2026-10-23
  • CNAweakness (CWE)CWE-122known since 2026-10-23
  • NVDweakness (CWE)CWE-787read 2026-10-23
  • FIRST EPSSEPSS score1.5 %2026-11-08
  • GitHub Advisoriesadvisory—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2023-10-12
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-33mh-qwc8-jxxx

Frequently asked questions

What is CVE-2023-27395?

A heap-based buffer overflow vulnerability exists in the vpnserver WpcParsePacket() functionality of SoftEther VPN 4.41-9782-beta, 5.01.9674 and 5.02. A specially crafted network packet can lead to arbitrary code execution. An attacker can perform a man-in-the-middle attack to trigger this vulnerability.

Is CVE-2023-27395 actively exploited?

Active exploitation of CVE-2023-27395 has not been confirmed. Its EPSS score was 1.5% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2023-27395?

CVE-2023-27395 has a CVSS v3 base score of 8.1 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

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