How severe is CVE-2025-25565?

CVE-2025-25565 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-25565 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-25565?

CVE-2025-25565 affects Softether Vpn. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-25565?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2025-25565 have an EU (EUVD) identifier?

Yes. CVE-2025-25565 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-6772.

When was CVE-2025-25565 published?

CVE-2025-25565 was published on 2025-03-12 and last updated on 2026-06-17.

CVE-2025-25565

CVE-2025-25565 is a critical-severity vulnerability in Softether Vpn with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-120.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (44th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-6772
Weakness: CWE-120
Affected product: Softether Vpn
Published: 2025-03-12
Last modified: 2026-06-17

Description

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 behavior only allows a user to attack himself by typing a long string on a command line.

Frequently asked questions

What is CVE-2025-25565?: 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 behavior only allows a user to attack himself by typing a long string on a command line.
How severe is CVE-2025-25565?: CVE-2025-25565 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-25565 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-25565?: CVE-2025-25565 affects Softether Vpn. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-25565?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2025-25565 have an EU (EUVD) identifier?: Yes. CVE-2025-25565 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-6772.
When was CVE-2025-25565 published?: CVE-2025-25565 was published on 2025-03-12 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:softether:vpn:5.02.5187:*:*:*:*:*:*:*

More vulnerabilities in Softether Vpn

CVE-2025-25568 — Critical (CVSS 9.8): SoftEtherVPN 5.02.5187 is vulnerable to Use after Free in the Command.c file via the CheckNetworkAcceptThread function.…
CVE-2025-25567 — Critical (CVSS 9.8): SoftEther VPN 5.02.5187 is vulnerable to Buffer Overflow in Internat.c via the UniToStrForSingleChars function. NOTE:…
CVE-2023-27395 — Critical (CVSS 9.0): A heap-based buffer overflow vulnerability exists in the vpnserver WpcParsePacket() functionality of SoftEther VPN…
CVE-2023-32634 — High (CVSS 7.8): An authentication bypass vulnerability exists in the CiRpcServerThread() functionality of SoftEther VPN 5.01.9674 and…
CVE-2023-25774 — High (CVSS 7.5): A denial-of-service vulnerability exists in the vpnserver ConnectionAccept() functionality of SoftEther VPN 5.02. A set…
CVE-2023-23581 — High (CVSS 7.5): A denial-of-service vulnerability exists in the vpnserver EnSafeHttpHeaderValueStr functionality of SoftEther VPN…

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