HOMEVULNERABILITIESCVE-2023-27395
HIGH

CVE-2023-27395

CWE-122Published: October 12, 2023· Updated: Jun 17, 2026

8.1
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2023-27395 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.1.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityHigh
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

softether1 product(s)
vpn
Source: NVD CPE · 3 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://www.softether.org/9-about/News/904-SEVPN202301
PATCHhttps://www.softether.org/9-about/News/904-SEVPN202301
ADVISORYhttps://talosintelligence.com/vulnerability_reports/TALOS-2023-1735
ADVISORYhttps://talosintelligence.com/vulnerability_reports/TALOS-2023-1735

All References (5)

→
https://talosintelligence.com/vulnerability_reports/TALOS-2023-1735Exploit · Third Party Advisory
→
https://www.softether.org/9-about/News/904-SEVPN202301Patch · Vendor Advisory
→
https://talosintelligence.com/vulnerability_reports/TALOS-2023-1735Exploit · Third Party Advisory
→
https://www.softether.org/9-about/News/904-SEVPN202301Patch · Vendor Advisory
→
https://www.talosintelligence.com/vulnerability_reports/TALOS-2023-1735

Quick Facts

CVE IDCVE-2023-27395
CVSS Score8.1 / 10
SeverityHIGH
WeaknessCWE-122
CISA KEVNo
Affected1 vendor(s)
PublishedOct 12, 2023

Related CVEs (CWE-122)

CVE-2022-34819
10.0
CVE-2025-23123
10.0
CVE-2026-46752
10.0
CVE-2021-25387
10.0
CVE-2021-21940
10.0
CVE-2026-44050
9.9

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2023-27395 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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