CVE-2023-27516

Name: CVE-2023-27516
Creator: NVD / NIST
Published: 2023-10-12T16:15:11.67+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 0.53%

Last modified Jun 17, 2026

CVE-2023-27516 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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. EPSS estimates a 0.53% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.8/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

0.53%

40.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions	Update
Softether	Vpn	4.41-9782	Beta
Softether	Vpn	5.01.9674	—

References

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

Timeline

Published: Oct 12, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-27516?

How severe is CVE-2023-27516?

CVE-2023-27516 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.53% probability of exploitation in the next 30 days.

How do I fix CVE-2023-27516?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-27516?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST