CVE-2025-32787Network attack vector

VPN service crash via unchecked packet parse result

Published Apr 16, 2025 · Updated Apr 17, 2025

NULL pointer dereference in SoftEther VPN 5.02.5184 through 5.02.5187 allows remote authenticated users to crash the VPN server. StorePacket reparses a copied packet and passes a NULL result from ParsePacket to DeleteIPv6DefaultRouterInRA, which dereferences it without checking. The path requires IPv6 both outside and inside the tunnel, an ICMPv6 router advertisement, and a malformed packet; the vendor states that initial parsing discards such a packet before StorePacket is reached.

CVSS severity3.1
Low
EPSS probability0.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in SoftEther VPN 5.02.5184 through 5.02.5187 allows remote authenticated users to crash the VPN server. StorePacket reparses a copied packet and passes a NULL result from ParsePacket to DeleteIPv6DefaultRouterInRA, which dereferences it without checking. The path requires IPv6 both outside and inside the tunnel, an ICMPv6 router advertisement, and a malformed packet; the vendor states that initial parsing discards such a packet before StorePacket is reached.

The record

CVE
CVE-2025-32787
Published
Apr 16, 2025
Updated
Apr 17, 2025
Vendor
SoftEther VPN Project
Product
SoftEther VPN
Classifications
CWE-476, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 16, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 17, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 5.02.5184, <= 5.02.5187

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

SoftEther VPN Project · SoftEther VPNversion=>= 5.02.5184, <= 5.02.5187

Published CVSS scores

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

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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