CVE-2024-38520 SoftEther VPN with L2TP - 2.75x Amplification
Attackers can use SoftEther VPN servers with L2TP enabled to launch amplification DDoS attacks against third-party targets.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2024-38520?
CVE-2024-38520 is a medium-severity denial of service vulnerability in SoftEtherVPN, published on 26 Jun 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-400
Which versions are affected by CVE-2024-38520?
How do I fix CVE-2024-38520?
No fix has been published for CVE-2024-38520 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2024-38520 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-38520 exists.
Sources
Also known as GHSA-j35p-p8pj-vqxq.