How severe is CVE-2025-25567?

CVE-2025-25567 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-2025-25567 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (42nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-25567?

CVE-2025-25567 affects Softether Vpn. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-25567?

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-2025-25567 have an EU (EUVD) identifier?

Yes. CVE-2025-25567 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-6775.

When was CVE-2025-25567 published?

CVE-2025-25567 was published on 2025-03-12 and last updated on 2026-06-17.

CVE-2025-25567

CVE-2025-25567 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% (42nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-6775
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 Internat.c via the UniToStrForSingleChars function. NOTE: the Supplier disputes this because the behavior only enables a local user to attack himself through the UI,

Frequently asked questions

What is CVE-2025-25567?: 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 local user to attack himself through the UI,
How severe is CVE-2025-25567?: CVE-2025-25567 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-2025-25567 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (42nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-25567?: CVE-2025-25567 affects Softether Vpn. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-25567?: 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-2025-25567 have an EU (EUVD) identifier?: Yes. CVE-2025-25567 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-6775.
When was CVE-2025-25567 published?: CVE-2025-25567 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-2025-25565 — Critical (CVSS 9.8): SoftEther VPN 5.02.5187 is vulnerable to Buffer Overflow in the Command.c file via the PtMakeCert and PtMakeCert2048…
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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