HOMEVULNERABILITIESCVE-2023-27516
HIGH

CVE-2023-27516

CWE-453Published: October 12, 2023· Updated: Jun 17, 2026

7.8
CVSS v3.1

Official Description

An authentication bypass vulnerability exists in the CiRpcAccepted() functionality of SoftEther VPN 4.41-9782-beta and 5.01.9674. A specially crafted network packet can lead to unauthorized access. An attacker can send a network request to trigger this vulnerability.

NVD Source

Technical Analysis

CVE-2023-27516 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

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 7.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

softether1 product(s)
vpn
Source: NVD CPE · 2 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-2023-1754
ADVISORYhttps://talosintelligence.com/vulnerability_reports/TALOS-2023-1754

All References (5)

→
https://talosintelligence.com/vulnerability_reports/TALOS-2023-1754Exploit · Third Party Advisory
→
https://www.softether.org/9-about/News/904-SEVPN202301Patch · Vendor Advisory
→
https://talosintelligence.com/vulnerability_reports/TALOS-2023-1754Exploit · Third Party Advisory
→
https://www.softether.org/9-about/News/904-SEVPN202301Patch · Vendor Advisory
→
https://www.talosintelligence.com/vulnerability_reports/TALOS-2023-1754

Quick Facts

CVE IDCVE-2023-27516
CVSS Score7.8 / 10
SeverityHIGH
WeaknessCWE-453
CISA KEVNo
Affected1 vendor(s)
PublishedOct 12, 2023

Related CVEs (CWE-453)

CVE-2025-47945
9.8
CVE-2021-27426
9.8
CVE-2024-21411
8.8
CVE-2024-49120
8.1
CVE-2022-3262
8.1
CVE-2025-48563
7.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2023-27516 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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