Amplification Vulnerability in fastd VPN Daemon
CVE-2025-24356

6.9MEDIUM

Key Information:

Vendor

Neocturne

Status
Fastd
Vendor
CVE Published:
27 January 2025

What is CVE-2025-24356?

fastd, a VPN daemon known for tunneling IP packets, has a vulnerability that allows attackers to exploit the fast reconnect feature. By sending UDP packets with spoofed source addresses, an attacker can induce the fastd instance to initiate a handshake with an amplification factor of approximately 12-13 times. This behavior can facilitate Distributed Denial of Service (DDoS) attacks against targeted networks, making it essential for users to update to version 23 or later to mitigate this risk.

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Affected Version(s)

fastd < 23

References

https://github.com/neocturne/fastd/security/advisories/GH...
x_refsource_CONFIRM
https://github.com/neocturne/fastd/commit/1f233bee76b722c...
x_refsource_MISC
https://github.com/neocturne/fastd/commit/3940150e801d0c9...
x_refsource_MISC

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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