CVE-2024-38520

SoftEther VPN with L2TP - 2.75x Amplification

CVSS 5.3 MEDIUMEPSS 0.5%CWE-400

Vexday Risk Score

13Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 5.3EPSS 0.5%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

26 Jun 2024Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

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

Affected products

SoftEtherVPN · SoftEtherVPN

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References

https://github.com/SoftEtherVPN/SoftEtherVPN/commit/c2a7aa548137dc80c6aafdc645cf4dc34e0dc764 https://github.com/SoftEtherVPN/SoftEtherVPN/releases/tag/5.02.5185 https://github.com/SoftEtherVPN/SoftEtherVPN/security/advisories/GHSA-j35p-p8pj-vqxq