SoftEther is a narrowly scoped but strategically significant VPN platform and driver stack deployed in enterprise remote-access and network-bridge scenarios. Vulnerabilities affecting the vendor skew toward serious outcomes, concentrating in classic memory-safety issues such as buffer overflows, out-of-bounds writes, and heap corruption that are endemic to native networking code, and the recurring exposure spans its core VPN product and kernel-mode driver components. Defenders should treat SoftEther advisories as high-priority, especially where instances are internet-facing or handle untrusted network input; live severity and exploitation activity are shown alongside this summary.
The number and severity of CVEs published that impact products developed by Softether over time
Signals from CVEs in this vendor scope (15 CVEs).
15 CVEs · Highest risk first
| CVE | Published | CVSS | Risk | KEV | Exploit |
|---|---|---|---|---|---|
CVE-2025-25568CRITICAL SoftEtherVPN 5.02.5187 is vulnerable to Use after Free in the Command.c file via the CheckNetworkAcceptThread function. NOTE: the Supplier disputes this because the use-after-free | Mar 12, 2025 | 9.8 | 29 | NO | NO |
CVE-2023-27395HIGH 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 p | Oct 12, 2023 | 8.1 | 27 | NO | NO |
CVE-2025-25567CRITICAL SoftEther VPN 5.02.5187 is vulnerable to Buffer Overflow in Internat.c via the UniToStrForSingleChars function. NOTE: the Supplier disputes this because the behavior only enables a | Mar 12, 2025 | 9.8 | 26 | NO | NO |
CVE-2026-39312HIGH SoftEtherVPN is a an open-source cross-platform multi-protocol VPN Program. In 5.2.5188 and earlier, a pre-authentication denial-of-service vulnerability exists in SoftEther VPN De | Apr 7, 2026 | 7.5 | 25 | NO | NO |
CVE-2025-25565CRITICAL SoftEther VPN 5.02.5187 is vulnerable to Buffer Overflow in the Command.c file via the PtMakeCert and PtMakeCert2048 functions. NOTE: the Supplier disputes this because the behavio | Mar 12, 2025 | 9.8 | 25 | NO | NO |
CVE-2019-11868HIGH See.sys, up to version 4.25, in SoftEther VPN Server versions 4.29 or older, allows a user to call an IOCTL specifying any kernel address to which arbitrary bytes are written to. | Jul 29, 2019 | 7.8 | 24 | NO | NO |
CVE-2023-27516HIGH 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 una | Oct 12, 2023 | 7.8 | 23 | NO | NO |
CVE-2023-25774HIGH A denial-of-service vulnerability exists in the vpnserver ConnectionAccept() functionality of SoftEther VPN 5.02. A set of specially crafted network connections can lead to denial | Oct 12, 2023 | 7.5 | 23 | NO | NO |
CVE-2023-22308HIGH An integer underflow vulnerability exists in the vpnserver OvsProcessData functionality of SoftEther VPN 5.01.9674 and 5.02. A specially crafted network packet can lead to denial o | Oct 12, 2023 | 7.5 | 23 | NO | NO |
CVE-2023-32634HIGH An authentication bypass vulnerability exists in the CiRpcServerThread() functionality of SoftEther VPN 5.01.9674 and 4.41-9782-beta. An attacker can perform a local man-in-the-mid | Oct 12, 2023 | 7.4 | 22 | NO | NO |
Signals from CVEs in this vendor scope (15 CVEs).
An overview of all social media posts that mention a CVE ID that affects a product developed by Softether.
Media articles that mention a CVE ID that affects a product developed by Softether — matched by CVE ID, not by vendor name.