SoftEther VPN with L2TP - 2.75x Amplification
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · Low
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-400.
Summary
SoftEtherVPN is a an open-source cross-platform multi-protocol VPN Program. When SoftEtherVPN is deployed with L2TP enabled on a device, it introduces the possibility of the host being used for amplification/reflection traffic generation because it will respond to every packet with two response packets that are larger than the request packet size. These sorts of techniques are used by external actors who generate spoofed source IPs to target a destination on the internet. This vulnerability has been patched in version 5.02.5185.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| SoftEtherVPN | SoftEtherVPN | up to 5.02.5183 | — | No fix listed | CNA |
- SoftEtherVPN VendorSoftEtherVPN Affected up to 5.02.5183 Fixed in — No fix listed CNA
CPE names CISA-ADP · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:softether:vpn:5.02:*:*:*:*:*:*:* | 5.02 | — | SoftEther VPN |
- cpe:2.3:a:softether:vpn:5.02:*:*:*:*:*:*:* Versions 5.02 — ·SoftEther VPN
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2024-38520
References
More SoftEtherVPN vulnerabilities
- TI-2025-23824 SoftEtherVPN Affected by NULL dereference in DeleteIPv6DefaultRouterInRA CVSS 3.1LOW 3.1
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences