An authentication bypass vulnerability exists in the CiRpcAccepted() functionality of…
Priority HIGH 67CWE-453Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA.
Summary
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.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.0053 45th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| SoftEther VPN | SoftEther VPN | 4.41-9782-beta; 5.01.9674 | — | No fix listed | CNA |
- SoftEther VPN VendorSoftEther VPN Affected 4.41-9782-beta; 5.01.9674 Fixed in — No fix listed CNA
CPE configurations NVD · 2
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:softether:vpn:4.41-9782:beta:*:*:*:*:*:* | 4.41-9782 beta | Vulnerable | SoftEther VPN |
| cpe:2.3:a:softether:vpn:5.01.9674:*:*:*:*:*:*:* | 5.01.9674 | Vulnerable | SoftEther VPN |
- cpe:2.3:a:softether:vpn:4.41-9782:beta:*:*:*:*:*:* Versions 4.41-9782 beta Vulnerable ·SoftEther VPN
- cpe:2.3:a:softether:vpn:5.01.9674:*:*:*:*:*:*:* Versions 5.01.9674 Vulnerable ·SoftEther VPN
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2023-27516
- 2026-10-03 Alias added: GHSA-cw58-3hpw-976j
References
More SoftEther VPN Vpn vulnerabilities
- TI-2025-19052 SoftEtherVPN 5.02.5187 is vulnerable to Use after Free in the Command.c file via the… CVSS 3.1CRITICAL 9.8
- TI-2025-19051 SoftEther VPN 5.02.5187 is vulnerable to Buffer Overflow in Internat.c via the… CVSS 3.1CRITICAL 9.8
- TI-2025-19049 SoftEther VPN 5.02.5187 is vulnerable to Buffer Overflow in the Command.c file via the… CVSS 3.1CRITICAL 9.8
- TI-2023-15913 An authentication bypass vulnerability exists in the CiRpcServerThread() functionality of… CVSS 3.1HIGH 7.8
- TI-2023-08590 Infinite loop in SoftEther VPN CVSS 3.1MEDIUM 5.9
- TI-2025-19050 Memory Leak vulnerability in SoftEtherVPN 5.02.5187 allows an attacker to cause a denial… CVSS 3.1MEDIUM 5.6
Sources
- CVE-2023-27516 · CVE Program
- CVE-2023-27516 · NVD
- FIRST EPSS
- GHSA-cw58-3hpw-976j · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences